{"id":13628,"date":"2025-10-03T12:03:41","date_gmt":"2025-10-03T11:03:41","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=13628"},"modified":"2026-02-13T07:18:57","modified_gmt":"2026-02-13T07:18:57","slug":"atmosphere-top-100-mcqs-with-answer-and-explanation-2","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/10\/03\/atmosphere-top-100-mcqs-with-answer-and-explanation-2\/","title":{"rendered":"Atmosphere Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">1. The atmosphere is held around the Earth due to____________.<\/mark><\/strong><br>A) Earth\u2019s rotation<br>B) Earth\u2019s gravity<br>C) Solar radiation<br>D) Centrifugal force<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  The gravitational pull of Earth holds the atmospheric gases around it.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">2. Which gas is most abundant in the Earth\u2019s atmosphere?<\/mark><\/strong><br>A) Oxygen<br>B) Carbon dioxide<br>C) Nitrogen<br>D) Argon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Nitrogen forms ~78% of the atmosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">3. Oxygen constitutes about what percentage of the atmosphere?<\/mark><\/strong><br>A) 15%<br>B) 21%<br>C) 25%<br>D) 30%<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Oxygen makes up ~20.9% of the atmosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">4. The layer of the atmosphere closest to the Earth\u2019s surface is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Stratosphere<br>B) Mesosphere<br>C) Troposphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Troposphere extends up to ~8\u201318 km from Earth\u2019s surface and contains weather systems.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">5. The upper boundary of the troposphere is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Tropopause<br>B) Stratopause<br>C) Mesopause<br>D) Thermopause<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Tropopause separates troposphere and stratosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">6. Which atmospheric layer contains the ozone layer?<\/mark><\/strong><br>A) Troposphere<br>B) Stratosphere<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Ozone concentration is highest between 15\u201335 km in the stratosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">7. The average height of the troposphere at the equator is about<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) 8 km<br>B) 12 km<br>C) 16\u201318 km<br>D) 20 km<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  The troposphere is thickest at the equator due to convectional uplift.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">8. Which gas absorbs most of the harmful ultraviolet radiation?<\/mark><\/strong><br>A) Oxygen<br>B) Ozone<br>C) Nitrogen<br>D) Argon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Ozone in the stratosphere absorbs UV-B and UV-C radiation.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">9. Which atmospheric layer helps in radio communication by reflecting radio waves?<\/mark><\/strong><br>A) Troposphere<br>B) Stratosphere<br>C) Ionosphere<br>D) Exosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Ionosphere (part of thermosphere) reflects radio waves due to charged particles.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">10. The coldest part of the atmosphere is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Troposphere<br>B) Stratosphere<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Temperature falls up to \u221290\u00b0C in the mesosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">11. The hottest part of the atmosphere is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Troposphere<br>B) Stratosphere<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D <\/b><BR>\n<b>Explanation:<\/b>  High energy solar radiation heats the thermosphere, raising temperatures to 1000\u00b0C or more.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">12. Which gas is responsible for the greenhouse effect most significantly?<\/mark><\/strong><br>A) Nitrogen<br>B) Oxygen<br>C) Carbon dioxide<br>D) Argon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  CO\u2082 traps infrared radiation, contributing to global warming.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">13. The percentage of carbon dioxide in the atmosphere is about<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) 0.03%<br>B) 0.1%<br>C) 0.3%<br>D) 1%<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Atmospheric CO\u2082 concentration is about 0.03\u20130.04%.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">14. The exosphere mainly contains<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Oxygen and nitrogen<br>B) Hydrogen and helium<br>C) Ozone<br>D) Carbon dioxide<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  The exosphere is the outermost layer with light gases like hydrogen and helium.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">15. Which instrument is used to measure atmospheric pressure?<\/mark><\/strong><br>A) Thermometer<br>B) Anemometer<br>C) Barometer<br>D) Hygrometer<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Barometer measures atmospheric pressure, usually in millibars (mb).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">16. One standard atmosphere pressure is equal to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) 1013.25 mb<br>B) 760 mm Hg<br>C) 29.92 inches of mercury<br>D) All of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Standard atmospheric pressure can be expressed in different units.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">17. Which layer of atmosphere protects us from meteors?<\/mark><\/strong><br>A) Troposphere<br>B) Stratosphere<br>C) Mesosphere<br>D) Exosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Meteors burn up in the mesosphere due to friction with air molecules.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">18. The ionosphere is important for<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Rainfall<br>B) Ozone formation<br>C) Radio communication<br>D) Earthquake prediction<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Charged particles in the ionosphere reflect radio signals.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">19. Which gas is essential for photosynthesis?<\/mark><\/strong><br>A) Nitrogen<br>B) Oxygen<br>C) Carbon dioxide<br>D) Argon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Plants use CO\u2082 to produce food during photosynthesis.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>20. The composition of the atmosphere up to 80 km is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Heterosphere<br>B) Homosphere<br>C) Ionosphere<br>D) Exospher<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Homosphere is the well-mixed part of atmosphere up to 80 km.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>21. Above 80 km, gases are stratified by molecular weight. This region is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Exosphere<br>B) Mesosphere<br>C) Heterosphere<br>D) Troposphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  In the heterosphere, lighter gases are found at higher altitudes.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">22. Which layer is known as the \u201cweather-making\u201d layer?<\/mark><\/strong><br>A) Stratosphere<br>B) Troposphere<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  All weather phenomena like clouds, rainfall, storms occur in the troposphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">23. Which of the following is NOT a greenhouse gas?<\/mark><\/strong><br>A) Water vapor<br>B) Carbon dioxide<br>C) Methane<br>D) Oxygen<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Oxygen does not absorb infrared radiation; it is not a greenhouse gas.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">24. Which atmospheric gas has the highest capacity to absorb long-wave radiation per molecule?<\/mark><\/strong><br>A) CO\u2082<br>B) CH\u2084 (Methane)<br>C) N\u2082O (Nitrous oxide)<br>D) CFCs<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  CFCs have the highest global warming potential among greenhouse gases.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">25. The ozone hole is found over<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) North America<br>B) Antarctica<br>C) Sahara Desert<br>D) Himalayas<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Ozone depletion is maximum over Antarctica due to polar stratospheric clouds.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">26. The process of heating the atmosphere by short-wave solar radiation and long-wave terrestrial radiation is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Conduction<br>B) Convection<br>C) Radiation balance<br>D) Greenhouse effect<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  The greenhouse effect occurs when gases trap heat radiated from Earth.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">27. The tropopause is higher at the<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Poles<br>B) Mid-latitudes<br>C) Equator<br>D) Oceans<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  At the equator, it rises up to ~18 km due to strong convection currents.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">28. The atmosphere is divided into layers on the basis of<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Chemical composition<br>B) Temperature<br>C) Pressure<br>D) Density<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Atmospheric layers are distinguished by temperature variations with altitude.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">29. The average lapse rate in the troposphere is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) 3.5\u00b0C per km<br>B) 5\u00b0C per km<br>C) 6.5\u00b0C per km<br>D) 10\u00b0C per km<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Temperature decreases by ~6.5\u00b0C per km in the troposphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">30. The upper boundary of the stratosphere is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Stratopause<br>B) Tropopause<br>C) Mesopause<br>D) Exopause<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Stratopause marks the transition between stratosphere and mesosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>31. Which gas absorbs outgoing terrestrial radiation most effectively?<\/strong><br><\/mark>A) Oxygen<br>B) Ozone<br>C) Carbon dioxide<br>D) Argon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  CO\u2082 strongly absorbs infrared radiation, contributing to the greenhouse effect.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>32. Which is the least abundant gas in the atmosphere among the following?<\/strong><br><\/mark>A) Argon<br>B) Carbon dioxide<br>C) Neon<br>D) Krypton<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Krypton is present only in trace amounts.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>33. Jet streams occur in which layer of the atmosphere?<\/strong><br><\/mark>A) Troposphere<br>B) Stratosphere (upper troposphere-lower stratosphere boundary)<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Jet streams blow at ~9\u201314 km altitude, near tropopause.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>34. Which element of weather is measured by an anemometer?<\/strong><br><\/mark>A) Temperature<br>B) Humidity<br>C) Wind speed<br>D) Atmospheric pressure<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Anemometer measures wind velocity.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>35. The instrument used to measure humidity is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Thermometer<br>B) Barometer<br>C) Hygrometer<br>D) Pyranometer<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Hygrometer measures the moisture content of air.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>36. The instrument used to measure solar radiation is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Pyranometer<br>B) Thermometer<br>C) Barometer<br>D) Anemometer<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Pyranometer measures solar radiation intensity.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>37. The total incoming solar radiation received at the Earth\u2019s surface is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Insolation<br>B) Albedo<br>C) Radiative forcing<br>D) Solar constant<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Insolation refers to the solar energy received per unit area.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">38. The percentage of insolation reflected back to space by Earth\u2019s surface is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Radiation budget<br>B) Greenhouse effect<br>C) Albedo<br>D) Heat balance<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Albedo is the reflectivity of Earth\u2019s surface.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>39. The average albedo of Earth is about<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) 10%<br>B) 20%<br>C) 30%<br>D) 50%<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  About one-third of insolation is reflected back into space.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>40. The solar constant is approximately<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) 1.36 W\/m\u00b2<br>B) 136 W\/m\u00b2<br>C) 1360 W\/m\u00b2<br>D) 13,600 W\/m\u00b2<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Solar constant = 1361 W\/m\u00b2, energy received outside Earth\u2019s atmosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>41. The term \u201cweather\u201d refers to atmospheric conditions over<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) A long period<br>B) A short period<br>C) Entire Earth<br>D) Millions of years<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Weather means short-term atmospheric conditions.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>42. The term \u201cclimate\u201d refers to atmospheric conditions over<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Days<br>B) Weeks<br>C) 30 years or more<br>D) Hours<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Climate is long-term average of weather conditions.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>43. The process of heat transfer by direct contact is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Radiation<br>B) Convection<br>C) Conduction<br>D) Advection<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Conduction transfers heat between molecules in contact.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">44. The horizontal movement of air is known as<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Conduction<br>B) Convection<br>C) Advection<br>D) Radiation<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Advection is horizontal transfer of heat by air movement.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>45. The vertical movement of air due to heating is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Conduction<br>B) Convection<br>C) Advection<br>D) Radiation<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Convection is upward movement of warm air and sinking of cold air.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>46. Which factor decreases with increase in altitude?<\/strong><br><\/mark>A) Temperature<br>B) Pressure<br>C) Density<br>D) All of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Temperature, pressure, and density generally decrease with altitude.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>47. Which gas is lighter and rises to the top in the exosphere?<\/strong><br><\/mark>A) Oxygen<br>B) Nitrogen<br>C) Hydrogen<br>D) Carbon dioxide<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Hydrogen is the lightest gas and is found in the outermost layer.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>48. The aurora borealis (northern lights) occur in which layer?<\/strong><br><\/mark>A) Troposphere<br>B) Stratosphere<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Aurora occurs due to interaction of charged particles with Earth\u2019s magnetic field in the thermosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>49. Which atmospheric layer is also called the \u201cionized layer\u201d?<\/strong><br><\/mark>A) Troposphere<br>B) Ionosphere<br>C) Stratosphere<br>D) Mesosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Ionosphere is filled with ions and free electrons, enabling radio communication.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>50. Which layer marks the boundary between atmosphere and outer space?<\/strong><br><\/mark>A) Tropopause<br>B) Stratopause<br>C) Exosphere<br>D) Mesopause<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Exosphere (~600 km and above) merges gradually into outer space.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>51. Which layer of the atmosphere is directly responsible for weather phenomena?<\/strong><br><\/mark>A) Stratosphere<br>B) Troposphere<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Weather like clouds, rainfall, winds, and storms all occur in the troposphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>52. The stratosphere is preferred by jet aircrafts because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) It has high pressure<br>B) It has calm and stable conditions<br>C) It contains ozone<br>D) It is nearest to Earth<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Lack of turbulence in the stratosphere ensures smooth flying.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>53. Which gas, though present in small amounts, is crucial for weather processes?<\/strong><br><\/mark>A) Oxygen<br>B) Nitrogen<br>C) Carbon dioxide<br>D) Water vapor<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Water vapor controls humidity, cloud formation, and rainfall.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">54. The lapse rate in the troposphere is negative because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/mark><\/strong><br>A) Temperature increases with height<br>B) Temperature decreases with height<br>C) Pressure increases with height<br>D) Ozone absorbs UV rays<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  In the troposphere, temperature drops ~6.5\u00b0C per km.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>55. In the stratosphere, temperature increases with altitude because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Ozone absorbs ultraviolet radiation<br>B) CO\u2082 absorbs heat<br>C) Water vapor condenses<br>D) Air pressure is high<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Ozone converts UV radiation into heat, raising stratospheric temperature.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>56. The mesosphere is colder because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) It has ozone<br>B) It lacks water vapor and CO\u2082<br>C) It has high pressure<br>D) Solar energy is trapped<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  These greenhouse gases are absent, causing rapid cooling.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>57. Which phenomenon proves that the outer core of Earth is liquid, indirectly linked to atmosphere studies?<\/strong><br><\/mark>A) P-wave shadow zone<br>B) S-wave disappearance<br>C) Jet streams<br>D) Lapse rate<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  S-waves don\u2019t travel through liquid outer core; seismic studies help atmospheric sciences.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>58. Which atmospheric layer extends roughly between 80 km and 480 km?<\/strong><br><\/mark>A) Troposphere<br>B) Stratosphere<br>C) Ionosphere<br>D) Exosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Ionosphere lies within the thermosphere, 80\u2013480 km altitude.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>59. Which gas is absent in the stratosphere but abundant in the troposphere?<\/strong><br><\/mark>A) Oxygen<br>B) Nitrogen<br>C) Carbon dioxide<br>D) Water vapor<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Stratosphere is almost dry, while troposphere contains nearly all atmospheric water vapor.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>60. The height of the mesosphere above Earth\u2019s surface is about<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) 0\u201312 km<br>B) 12\u201350 km<br>C) 50\u201380 km<br>D) 80\u2013600 km<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Mesosphere extends from ~50 km to 80 km altitude.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>61. The temperature in the thermosphere rises because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Clouds trap heat<br>B) Ozone absorbs UV<br>C) Atoms absorb high-energy solar radiation<br>D) Reflection of sunlight<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Oxygen and nitrogen atoms absorb X-rays and UV radiation.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>62. Which process removes carbon dioxide from the atmosphere?<\/strong><br><\/mark>A) Respiration<br>B) Combustion<br>C) Photosynthesis<br>D) Volcanism<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Plants absorb CO\u2082 during photosynthesis.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>63. The pressure decreases with height because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Gravity weakens<br>B) Gases escape<br>C) Density of air decreases<br>D) Temperature falls<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Fewer air molecules are present at higher altitudes.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>64. What is the approximate percentage of Argon in the atmosphere?<\/strong><br><\/mark>A) 1%<br>B) 2%<br>C) 5%<br>D) 10%<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Argon is about 0.93% of the atmosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>65. Which atmospheric layer contains meteors that burn up?<\/strong><br><\/mark>A) Troposphere<br>B) Stratosphere<br>C) Mesosphere<br>D) Thermosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>   Meteors burn due to friction in the mesosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>66. Which gas forms acid rain when combined with water vapor?<\/strong><br><\/mark>A) Oxygen<br>B) Nitrogen oxides and sulfur dioxide<br>C) Carbon dioxide<br>D) Ozone<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  SO\u2082 and NO\u2093 react with water to form sulfuric and nitric acid.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>67. The greenhouse gas with the highest global warming potential is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Carbon dioxide<br>B) Methane<br>C) Nitrous oxide<br>D) CFCs<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  CFCs trap thousands of times more heat per molecule than CO\u2082.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>68. Which part of the atmosphere has auroras (northern and southern lights)?<\/strong><br><\/mark>A) Mesosphere<br>B) Troposphere<br>C) Thermosphere<br>D) Stratosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Auroras occur due to charged particles in the thermosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>69. Atmospheric pressure is highest at<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Sea level<br>B) 1 km altitude<br>C) 5 km altitude<br>D) 10 km altitude<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Air pressure decreases with height, maximum at sea level.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>70. Which element of weather is measured by a rain gauge?<\/strong><br><\/mark>A) Temperature<br>B) Wind<br>C) Humidity<br>D) Rainfall<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  A rain gauge measures precipitation.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>71. Winds blowing from sea to land are called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Land breeze<br>B) Sea breeze<br>C) Monsoon<br>D) Trade winds<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Sea breeze occurs during daytime when land heats faster than sea.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>72. Winds blowing from land to sea at night are called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Sea breeze<br>B) Land breeze<br>C) Monsoon winds<br>D) Cyclonic winds<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  At night, land cools faster, creating land-to-sea breeze.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>73. Which gas in the atmosphere is essential for respiration?<\/strong><br><\/mark>A) Nitrogen<br>B) Oxygen<br>C) Carbon dioxide<br>D) Ozone<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Oxygen is vital for respiration in living beings.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>74. Which instrument is used to measure wind direction?<\/strong><br><\/mark>A) Anemometer<br>B) Wind vane<br>C) Barometer<br>D) Hygrometer<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  A wind vane indicates the direction of the wind.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>75. The ozone layer is found between<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) 5\u201310 km<br>B) 10\u201315 km<br>C) 15\u201335 km<br>D) 40\u201360 km<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Ozone concentration peaks in the stratosphere between 15\u201335 km altitude.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>76. The layer that separates the mesosphere and thermosphere is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Tropopause<br>B) Stratopause<br>C) Mesopause<br>D) Exopause<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Mesopause lies at ~80 km, the coldest part of the atmosphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>77. Which gas in the atmosphere is called \u201claughing gas\u201d?<\/strong><br><\/mark>A) Carbon dioxide<br>B) Nitrous oxide (N\u2082O)<br>C) Methane<br>D) Ozone<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  N\u2082O is known as laughing gas and is a greenhouse gas.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>78. Which layer is also called the \u201cblanket of silence\u201d because sound cannot travel in it?<\/strong><br><\/mark>A) Troposphere<br>B) Stratosphere<br>C) Thermosphere<br>D) Mesosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Air is very thin in thermosphere, so sound cannot propagate.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>79. Atmospheric pressure is measured in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Joules<br>B) Newtons<br>C) Pascals or millibars<br>D) Decibels<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Pressure units: 1 mb = 100 Pa.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>80. The ozone layer is destroyed by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Nitrogen<br>B) CFCs (Chlorofluorocarbons)<br>C) Carbon dioxide<br>D) Argon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  CFCs release chlorine atoms that break down ozone molecules.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>81. The main cause of acid rain is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) CO\u2082<br>B) SO\u2082 and NO\u2093<br>C) O\u2083<br>D) CH\u2084<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Sulfur dioxide and nitrogen oxides combine with water to form acid rain.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>82. In the troposphere, most heat is transferred by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Radiation<br>B) Convection<br>C) Conduction<br>D) Reflection<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Rising and sinking air currents (convection) transfer heat in the troposphere.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>83. The atmospheric pressure at sea level is about<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) 760 mm of Hg<br>B) 500 mm of Hg<br>C) 100 mm of Hg<br>D) 50 mm of Hg<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Sea-level standard pressure = 760 mm Hg (1013 mb).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>84. Which instrument is used to measure sunshine duration?<\/strong><br><\/mark>A) Pyrheliometer<br>B) Campbell\u2013Stokes recorder<br>C) Anemometer<br>D) Barograph<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  It uses a glass sphere to record sunshine hours on paper.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>85. The exosphere starts at about<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) 20 km<br>B) 80 km<br>C) 200 km<br>D) 600 km<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Exosphere begins around 600 km and merges with outer space.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>86. Which phenomenon is due to refraction of sunlight in the atmosphere?<\/strong><br><\/mark>A) Rainbow<br>B) Twilight<br>C) Aurora<br>D) Mirage<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Twilight (before sunrise and after sunset) is due to scattering and refraction of light.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>87. The aurora australis is seen in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Northern Hemisphere<br>B) Southern Hemisphere<br>C) Both hemispheres<br>D) Equator<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Aurora Australis occurs in the south polar region.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>88. The equatorial calm zone with little wind is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Horse latitude<br>B) Doldrums<br>C) Westerlies<br>D) Polar front<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Doldrums are calm equatorial regions near ITCZ (0\u00b0\u20135\u00b0).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>89. The subtropical calm belts at ~30\u00b0 latitudes are called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Doldrums<br>B) Horse latitudes<br>C) Westerlies<br>D) Polar easterlies<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Horse latitudes are calm high-pressure zones around 30\u00b0 N &#038; S.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>90. The trade winds blow from<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Poles to equator<br>B) Subtropical highs to equatorial lows<br>C) Equator to poles<br>D) West to east<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Trade winds blow towards the equator from subtropical highs.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>91. The westerlies are strongest in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Summer<br>B) Winter<br>C) Equinoxes<br>D) Monsoon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>   Westerlies strengthen during winter due to steep pressure gradients.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>92. The layer where temperature remains almost constant with altitude is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Troposphere<br>B) Tropopause<br>C) Stratosphere (lower)<br>D) Mesosphere<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>   Tropopause has isothermal conditions (constant temperature).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>93. Atmospheric humidity is measured in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Percentage<br>B) Grams per cubic meter<br>C) Millibars<br>D) Both (a) and (b)<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Humidity is measured as relative humidity (%) or absolute humidity (g\/m\u00b3).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>94. The unit of solar radiation energy is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Lumen<br>B) Joule per square meter<br>C) Hertz<br>D) Newton<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Insolation is measured in J\/m\u00b2.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>95. The main reason for atmospheric circulation is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Earth\u2019s shape<br>B) Unequal heating of Earth\u2019s surface<br>C) Earth\u2019s gravity<br>D) Ozone depletion<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Temperature and pressure differences drive atmospheric circulation.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>96. The Coriolis force is maximum at<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Equator<br>B) 30\u00b0 latitude<br>C) 45\u00b0 latitude<br>D) Poles<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Coriolis effect increases with latitude, maximum at poles.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>97. Which gas in the atmosphere is measured by the Keeling Curve?<\/strong><br><\/mark>A) Oxygen<br>B) Nitrogen<br>C) Carbon dioxide<br>D) Methane<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>   The Keeling Curve shows long-term CO\u2082 concentration trends.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>98. The highest pressure belts are found at<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Equator<br>B) 30\u00b0 latitudes<br>C) 60\u00b0 latitudes<br>D) Poles<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Polar regions are high-pressure belts due to descending cold air.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>99. The lowest pressure belt is found at<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">____________.<\/mark><\/strong><\/strong><br><\/mark>A) Equator<br>B) 30\u00b0 latitude<br>C) 60\u00b0 latitude<br>D) Poles<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  The equatorial low-pressure belt forms due to intense heating.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>100. Which gas is critical for shielding Earth from UV rays?<\/strong><br><\/mark>A) Oxygen<br>B) Ozone<br>C) Nitrogen<br>D) Argon<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Ozone layer protects life by absorbing harmful UV radiation.\n <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1. The atmosphere is held around the Earth due to____________.A) Earth\u2019s rotationB) Earth\u2019s gravityC) Solar radiationD) Centrifugal force Show Answer Answer: B Explanation: The gravitational pull of Earth holds the atmospheric gases around it. 2. Which gas is most abundant in the Earth\u2019s atmosphere?A) OxygenB) Carbon dioxideC) NitrogenD) Argon Show Answer Answer: C Explanation: Nitrogen<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,11121],"tags":[14434,14429,14431,14433,14435,14440,14428,14439,14408,14437,14438,14405,14410,14411,14388,14414,14409,14415,14401,14436,14367,14348,14432,14430,14441],"class_list":{"0":"post-13628","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-geography","7":"category-physical-geography","8":"tag-air-circulation-mcqs","9":"tag-atmosphere-mcqs","10":"tag-atmosphere-mcqs-with-answers","11":"tag-atmosphere-mcqs-with-explanation","12":"tag-atmosphere-multiple-choice-questions","13":"tag-atmosphere-objective-questions","14":"tag-atmosphere-quiz-questions","15":"tag-atmospheric-pressure-mcqs","16":"tag-class-11-geography-mcqs","17":"tag-climate-and-atmosphere-quiz","18":"tag-composition-of-atmosphere-mcqs","19":"tag-geography-gk-questions","20":"tag-geography-mcqs-for-ssc","21":"tag-geography-mcqs-for-upsc","22":"tag-geography-mcqs-with-answers","23":"tag-geography-objective-questions","24":"tag-geography-one-liner-questions","25":"tag-geography-questions-for-competitive-exams","26":"tag-geography-quiz-with-explanation","27":"tag-layers-of-the-atmosphere-mcqs","28":"tag-ncert-geography-mcqs","29":"tag-physical-geography-mcqs","30":"tag-structure-of-atmosphere-quiz","31":"tag-top-100-atmosphere-mcqs","32":"tag-weather-and-climate-mcqs"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13628","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=13628"}],"version-history":[{"count":104,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13628\/revisions"}],"predecessor-version":[{"id":47887,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13628\/revisions\/47887"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=13628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=13628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=13628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}