1. The instrument used to measure temperature is
A) Thermometer
B) Barometer
C) Hygrometer
D) Voltmeter
Answer: A) Thermometer
Explanation: A thermometer measures the degree of hotness or coldness of a body.
2. The instrument used to measure atmospheric pressure is
A) Barometer
B) Thermometer
C) Altimeter
D) Anemometer
Answer: A) Barometer
3. The instrument used to measure humidity in air is
A) Hygrometer
B) Barometer
C) Thermometer
D) Hydrometer
Answer: A) Hygrometer
4. The instrument used to measure the speed of wind is
A) Anemometer
B) Barometer
C) Altimeter
D) Odometer
Answer: A) Anemometer
5. The instrument used to measure the height above sea level is
A) Altimeter
B) Barometer
C) Hydrometer
D) Speedometer
Answer: A) Altimeter
6. The instrument used to measure the depth of the ocean is
A) Fathometer
B) Hydrometer
C) Barometer
D) Manometer
Answer: A) Fathometer
Explanation: A fathometer works on the echo-sounding principle to measure sea depth.
7. The instrument used to measure electric current is
A) Ammeter
B) Voltmeter
C) Ohmmeter
D) Galvanometer
Answer: A) Ammeter
8. The instrument used to measure electric potential difference is
A) Voltmeter
B) Ammeter
C) Galvanometer
D) Wattmeter
Answer: A) Voltmeter
9. The instrument used to measure electrical resistance is
A) Ohmmeter
B) Ammeter
C) Voltmeter
D) Galvanometer
Answer: A) Ohmmeter
10. The instrument used to detect the presence of electric current is
A) Galvanometer
B) Ammeter
C) Voltmeter
D) Wattmeter
Answer: A) Galvanometer
11. The instrument used to measure electric power is
A) Wattmeter
B) Ammeter
C) Voltmeter
D) Ohmmeter
Answer: A) Wattmeter
12. The instrument used to measure electric energy consumption is
A) Energy meter
B) Voltmeter
C) Ammeter
D) Ohmmeter
Answer: A) Energy meter
13. The instrument used to measure the intensity of light is
A) Photometer
B) Spectrometer
C) Colorimeter
D) Telescope
Answer: A) Photometer
14. The instrument used to study the spectrum of light is
A) Spectrometer
B) Microscope
C) Telescope
D) Photometer
Answer: A) Spectrometer
15. The instrument used to measure sound intensity is
A) Sound level meter
B) Audiometer
C) Barometer
D) Microphone
Answer: A) Sound level meter
16. The instrument used to test hearing ability is
A) Audiometer
B) Sound level meter
C) Microphone
D) Stethoscope
Answer: A) Audiometer
17. The instrument used by doctors to hear heartbeats is
A) Stethoscope
B) Endoscope
C) Thermometer
D) Barometer
Answer: A) Stethoscope
18. The instrument used to examine internal organs of the body is
A) Endoscope
B) Microscope
C) Telescope
D) Periscope
Answer: A) Endoscope
19. The instrument used to view distant objects is
A) Telescope
B) Microscope
C) Periscope
D) Endoscope
Answer: A) Telescope
20. The instrument used to see tiny objects is
A) Microscope
B) Telescope
C) Periscope
D) Binocular
Answer: A) Microscope
21. The instrument used to observe objects under water or from submarines is
A) Periscope
B) Microscope
C) Telescope
D) Endoscope
Answer: A) Periscope
22. The instrument used to measure the density of liquids is
A) Hydrometer
B) Hygrometer
C) Barometer
D) Manometer
Answer: A) Hydrometer
23. The instrument used to measure pressure of gases or liquids is
A) Manometer
B) Barometer
C) Hydrometer
D) Anemometer
Answer: A) Manometer
24. The instrument used to measure the speed of a moving vehicle is
A) Speedometer
B) Odometer
C) Tachometer
D) Barometer
Answer: A) Speedometer
25. The instrument used to measure the distance traveled by a vehicle is
A) Odometer
B) Speedometer
C) Tachometer
D) Chronometer
Answer: A) Odometer
26. The instrument used to measure the rotation speed of a machine is
A) Tachometer
B) Barometer
C) Hydrometer
D) Altimeter
Answer: A) Tachometer
27. The instrument used to measure time very accurately is
A) Chronometer
B) Stopwatch
C) Pendulum
D) Hourglass
Answer: A) Chronometer
28. The instrument used to record earthquakes is
A) Seismograph
B) Barometer
C) Manometer
D) Thermograph
Answer: A) Seismograph
29. The instrument used to measure rainfall is
A) Rain gauge
B) Barometer
C) Thermometer
D) Hygrometer
Answer: A) Rain gauge
30. The instrument used to measure sunshine duration is
A) Sunshine recorder
B) Barometer
C) Thermometer
D) Photometer
Answer: A) Sunshine recorder
31. The instrument used to measure electric charge is
A) Electroscope
B) Ammeter
C) Voltmeter
D) Ohmmeter
Answer: A) Electroscope
32. The instrument used to detect small currents is
A) Galvanometer
B) Ammeter
C) Voltmeter
D) Ohmmeter
Answer: A) Galvanometer
33. The instrument used to detect radio waves is
A) Antenna
B) Oscilloscope
C) Galvanometer
D) Spectrometer
Answer: A) Antenna
34. The instrument used to observe waveforms of electrical signals is
A) Oscilloscope
B) Voltmeter
C) Ammeter
D) Galvanometer
Answer: A) Oscilloscope
35. The instrument used to measure blood pressure is
A) Sphygmomanometer
B) Barometer
C) Hydrometer
D) Thermometer
Answer: A) Sphygmomanometer
36. The instrument used to measure relative density of milk is
A) Lactometer
B) Hydrometer
C) Barometer
D) Thermometer
Answer: A) Lactometer
37. The instrument used to determine purity of milk is
A) Lactometer
B) Barometer
C) Anemometer
D) Hygrometer
Answer: A) Lactometer
38. The instrument used to record temperature changes continuously is
A) Thermograph
B) Thermometer
C) Barograph
D) Manometer
Answer: A) Thermograph
39. The instrument used to record atmospheric pressure continuously is
A) Barograph
B) Barometer
C) Thermograph
D) Hygrometer
Answer: A) Barograph
40. The instrument used to measure optical density of a solution is
A) Colorimeter
B) Photometer
C) Spectrometer
D) Microscope
Answer: A) Colorimeter
41. The instrument used to measure the intensity of earthquakes is
A) Seismograph
B) Barometer
C) Hydrometer
D) Thermograph
Answer: A) Seismograph
Explanation: A seismograph records the vibrations of the ground during an earthquake and measures its intensity.
42. The instrument used to detect the presence of electric charge is
A) Gold-leaf electroscope
B) Ammeter
C) Voltmeter
D) Wattmeter
Answer: A) Gold-leaf electroscope
Explanation: When charged, its gold leaves diverge — indicating the presence of static electricity.
43. The instrument used to measure radioactivity is
A) Geiger-Müller counter
B) Photometer
C) Barometer
D) Microscope
Answer: A) Geiger-Müller counter
Explanation: It detects and counts ionizing radiations like alpha, beta, and gamma rays.
44. The instrument used to measure optical rotation is
A) Polarimeter
B) Spectrometer
C) Microscope
D) Photometer
Answer: A) Polarimeter
Explanation: A polarimeter is used to study the rotation of plane-polarized light through optically active substances.
45. The instrument used to split light into its component colors is
A) Prism or Spectroscope
B) Microscope
C) Periscope
D) Photometer
Answer: A) Prism or Spectroscope
Explanation: A spectroscope separates light into its spectrum to study wavelength composition.
46. The instrument used to record the direction and speed of wind is
A) Anemograph
B) Barograph
C) Altimeter
D) Wind vane
Answer: A) Anemograph
Explanation: An anemograph continuously records wind speed and direction on a chart.
47. The instrument used to measure angles of elevation and depression is
A) Theodolite
B) Sextant
C) Clinometer
D) Periscope
Answer: A) Theodolite
Explanation: Used in surveying to measure both horizontal and vertical angles.
48. The instrument used by sailors to measure the altitude of the sun and stars is
A) Sextant
B) Telescope
C) Barometer
D) Compass
Answer: A) Sextant
Explanation: It measures the angle between celestial objects and the horizon for navigation.
49. The instrument used to determine the purity and composition of substances by light is
A) Spectrophotometer
B) Photometer
C) Colorimeter
D) Microscope
Answer: A) Spectrophotometer
Explanation: It measures light absorbed by a solution at different wavelengths.
50. The instrument used to view very distant stars and galaxies is
A) Telescope
B) Microscope
C) Periscope
D) Endoscope
Answer: A) Telescope
Explanation: A telescope gathers light and magnifies distant celestial objects.
51. The instrument used to view two-dimensional images of internal body parts is
A) X-ray machine
B) Telescope
C) Periscope
D) Endoscope
Answer: A) X-ray machine
Explanation: X-rays penetrate soft tissues and are absorbed by bones to produce images.
52. The instrument used to measure radiation exposure is
A) Dosimeter
B) Barometer
C) Thermometer
D) Galvanometer
Answer: A) Dosimeter
Explanation: Used by radiologists and nuclear scientists to monitor radiation dosage.
53. The instrument used to measure the salinity of seawater is
A) Salinometer
B) Hydrometer
C) Hygrometer
D) Barometer
Answer: A) Salinometer
Explanation: It determines the concentration of salts dissolved in water.
54. The instrument used to measure the refractive index of liquids is
A) Refractometer
B) Polarimeter
C) Spectrometer
D) Photometer
Answer: A) Refractometer
Explanation: It measures how much light bends when it passes through a liquid.
55. The instrument used to measure atmospheric humidity is
A) Hygrometer
B) Barometer
C) Hydrometer
D) Manometer
Answer: A) Hygrometer
56. The instrument used to observe blood cells and bacteria is
A) Microscope
B) Telescope
C) Periscope
D) Camera
Answer: A) Microscope
Explanation: It magnifies small objects that cannot be seen by the naked eye.
57. The instrument used to observe atomic structure is
A) Electron microscope
B) Compound microscope
C) Simple microscope
D) Telescope
Answer: A) Electron microscope
Explanation: It uses electrons instead of light to give very high magnification and resolution.
58. The instrument used to measure light intensity in photosynthesis studies is
A) Lux meter
B) Photometer
C) Spectrometer
D) Calorimeter
Answer: A) Lux meter
Explanation: Lux meters measure light levels in environments, often used in plant and lab research.
59. The instrument used to measure heat radiation is
A) Bolometer
B) Barometer
C) Hygrometer
D) Photometer
Answer: A) Bolometer
Explanation: It detects and measures infrared radiation by temperature change.
60. The instrument used to measure atmospheric ozone concentration is
A) Ozonoscope
B) Ozonizer
C) Barometer
D) Thermometer
Answer: A) Ozonoscope
Explanation: It helps detect and measure ozone levels in the atmosphere.
61. The instrument used to detect and measure nuclear radiation is
A) Geiger counter
B) Photometer
C) Voltmeter
D) Microscope
Answer: A) Geiger counter
62. The instrument used to observe charged particles is
A) Cloud chamber
B) Electron microscope
C) Voltmeter
D) Photometer
Answer: A) Cloud chamber
Explanation: It shows tracks of ionizing radiation through vapor condensation.
63. The instrument used to detect magnetic fields is
A) Magnetometer
B) Galvanometer
C) Electroscope
D) Oscilloscope
Answer: A) Magnetometer
Explanation: It measures magnetic field strength and direction.
64. The instrument used to measure small weights with precision is
A) Analytical balance
B) Spring balance
C) Barometer
D) Odometer
Answer: A) Analytical balance
65. The instrument used to measure the specific gravity of liquids is
A) Hydrometer
B) Lactometer
C) Barometer
D) Manometer
Answer: A) Hydrometer
66. The instrument used to detect metals in the ground is
A) Metal detector
B) Magnetometer
C) Radar
D) Periscope
Answer: A) Metal detector
Explanation: It detects buried metallic objects using electromagnetic induction.
67. The instrument used to measure radio frequencies is
A) Frequency meter
B) Ammeter
C) Voltmeter
D) Galvanometer
Answer: A) Frequency meter
68. The instrument used to measure alternating current frequency is
A) Oscilloscope
B) Ammeter
C) Voltmeter
D) Potentiometer
Answer: A) Oscilloscope
69. The instrument used to record heart activity is
A) Electrocardiograph (ECG)
B) EEG
C) Stethoscope
D) Endoscope
Answer: A) Electrocardiograph (ECG)
Explanation: It records electrical signals of the heart.
70. The instrument used to record brain activity is
A) Electroencephalograph (EEG)
B) ECG
C) Endoscope
D) X-ray machine
Answer: A) EEG
71. The instrument used to measure the purity of gold is
A) Karat meter
B) Hydrometer
C) Refractometer
D) Polarimeter
Answer: A) Karat meter
72. The instrument used to detect submarines under water is
A) Sonar
B) Radar
C) Periscope
D) Telescope
Answer: A) Sonar
Explanation: SONAR uses sound waves to detect and locate underwater objects.
73. The instrument used to detect aircraft or ships is
A) Radar
B) Sonar
C) Telescope
D) Periscope
Answer: A) Radar
Explanation: RADAR uses radio waves for detecting and tracking distant objects.
74. The instrument used to record images of distant celestial objects is
A) Radio telescope
B) Microscope
C) Photometer
D) Periscope
Answer: A) Radio telescope
75. The instrument used to detect heat leaks in buildings is
A) Thermal imager
B) Barometer
C) Manometer
D) Seismograph
Answer: A) Thermal imager
Explanation: It captures infrared images showing areas of heat loss.
76. The instrument used to measure luminous intensity is
A) Photometer
B) Lux meter
C) Colorimeter
D) Spectrometer
Answer: A) Photometer
77. The instrument used to measure the speed of light is
A) Michelson interferometer
B) Spectrometer
C) Photometer
D) Telescope
Answer: A) Michelson interferometer
78. The instrument used to produce very high magnetic fields is
A) Cyclotron
B) Barometer
C) Anemometer
D) Odometer
Answer: A) Cyclotron
Explanation: It accelerates charged particles using electric and magnetic fields.
79. The instrument used to detect invisible radiation is
A) Photographic plate
B) Telescope
C) Microscope
D) Hygrometer
Answer: A) Photographic plate
80. The instrument used to count blood cells is
A) Hemocytometer
B) Microscope
C) Spectrometer
D) Colorimeter
Answer: A) Hemocytometer
81. The instrument used to measure blood sugar is
A) Glucometer
B) Lactometer
C) Hydrometer
D) Barometer
Answer: A) Glucometer
82. The instrument used to measure blood oxygen level is
A) Oximeter
B) Barometer
C) Sphygmomanometer
D) Thermometer
Answer: A) Oximeter
83. The instrument used to measure blood clotting time is
A) Coagulometer
B) Colorimeter
C) Lactometer
D) Hydrometer
Answer: A) Coagulometer
84. The instrument used to measure the force of wind is
A) Anemometer
B) Barometer
C) Thermometer
D) Speedometer
Answer: A) Anemometer
85. The instrument used to measure altitude of aircraft is
A) Altimeter
B) Odometer
C) Tachometer
D) Barometer
Answer: A) Altimeter
86. The instrument used to record time intervals accurately is
A) Stopwatch
B) Chronometer
C) Pendulum
D) Odometer
Answer: A) Stopwatch
87. The instrument used to measure salinity in soil is
A) Soil salinometer
B) Hydrometer
C) Barometer
D) Anemometer
Answer: A) Soil salinometer
88. The instrument used to measure gravitational acceleration is
A) Gravimeter
B) Galvanometer
C) Barometer
D) Voltmeter
Answer: A) Gravimeter
89. The instrument used to measure humidity and temperature together is
A) Psychrometer
B) Hydrometer
C) Manometer
D) Thermometer
Answer: A) Psychrometer
90. The instrument used to detect small changes in magnetic fields is
A) Fluxmeter
B) Voltmeter
C) Barometer
D) Ammeter
Answer: A) Fluxmeter
91. The instrument used to measure very high temperatures is
A) Pyrometer
B) Thermometer
C) Calorimeter
D) Barometer
Answer: A) Pyrometer
92. The instrument used to measure heat capacity is
A) Calorimeter
B) Thermometer
C) Barometer
D) Hygrometer
Answer: A) Calorimeter
93. The instrument used to measure radioactivity in air is
A) Ionization chamber
B) Photometer
C) Microscope
D) Barometer
Answer: A) Ionization chamber
94. The instrument used to detect infrared radiation is
A) Thermopile
B) Barometer
C) Photometer
D) Voltmeter
Answer: A) Thermopile
95. The instrument used to study atomic nuclei is
A) Cyclotron
B) Electron microscope
C) Spectrometer
D) Photometer
Answer: A) Cyclotron
96. The instrument used to detect earthquakes under the sea is
A) Hydrophone
B) Seismograph
C) Sonar
D) Radar
Answer: A) Hydrophone
97. The instrument used to record atmospheric electricity is
A) Electrometer
B) Barometer
C) Hygrometer
D) Ammeter
Answer: A) Electrometer
98. The instrument used to locate underground minerals is
A) Magnetometer
B) Radar
C) Thermometer
D) Barometer
Answer: A) Magnetometer
99. The instrument used to record variations in current over time is
A) Oscillograph
B) Ammeter
C) Voltmeter
D) Ohmmeter
Answer: A) Oscillograph
100. The instrument used to measure radioactive contamination is
A) Geiger counter
B) Photometer
C) Barometer
D) Microscope
Answer: A) Geiger counter
Explanation: It counts radiation pulses to determine contamination levels.