{"id":12776,"date":"2025-09-23T03:26:23","date_gmt":"2025-09-23T02:26:23","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=12776"},"modified":"2025-10-22T10:25:45","modified_gmt":"2025-10-22T09:25:45","slug":"fuels-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/23\/fuels-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Fuels Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. Which of the following is the primary source of energy on Earth?<\/strong><\/mark>
a) Coal
b) Sun
c) Petroleum
d) Natural Gas
Answer:<\/strong> b) Sun
Explanation:<\/strong> All fossil fuels and biomass originate from solar energy stored through photosynthesis.<\/p>\n\n\n\n

2. Fuel is defined as:<\/mark><\/strong>
a) A substance that produces heat on dissolution in water
b) A substance that produces energy when oxidized
c) A substance that increases temperature when cooled
d) A substance that absorbs oxygen
Answer:<\/strong> b) A substance that produces energy when oxidized
Explanation:<\/strong> Fuels release heat\/energy by combustion (oxidation).<\/p>\n\n\n\n

3. The unit of calorific value of fuel is:<\/mark><\/strong>
a) J\/kg
b) J\/mol
c) J\/m\u00b3
d) All of the above
Answer:<\/strong> a) J\/kg
Explanation:<\/strong> Calorific value is usually expressed in Joules per kilogram for solids\/liquids.<\/p>\n\n\n\n

4. Which fuel has the highest calorific value?<\/mark><\/strong>
a) Hydrogen
b) Coal
c) LPG
d) Methane
Answer:<\/strong> a) Hydrogen
Explanation:<\/strong> Hydrogen has ~150 kJ\/g, highest among common fuels.<\/p>\n\n\n\n

5. Which fuel is called the \u201cfuel of the future\u201d?<\/mark><\/strong>
a) LPG
b) Hydrogen
c) Biogas
d) Kerosene
Answer:<\/strong> b) Hydrogen
Explanation:<\/strong> Hydrogen is clean, produces only water on combustion.<\/p>\n\n\n\n

6. The calorific value of LPG is about:<\/mark><\/strong>
a) 20\u201325 kJ\/g
b) 35\u201340 kJ\/g
c) 45\u201350 kJ\/g
d) 55\u201360 kJ\/g
Answer:<\/strong> c) 45\u201350 kJ\/g
Explanation:<\/strong> LPG has high calorific value compared to coal and wood.<\/p>\n\n\n\n

7. Which of the following is not a fossil fuel?<\/mark><\/strong>
a) Coal
b) Petroleum
c) LPG
d) Hydrogen
Answer:<\/strong> d) Hydrogen
Explanation:<\/strong> Hydrogen is not derived from fossils.<\/p>\n\n\n\n

8. Which fuel is used in nuclear power plants?<\/mark><\/strong>
a) Uranium-235
b) Methane
c) Coal
d) LPG
Answer:<\/strong> a) Uranium-235
Explanation:<\/strong> Uranium-235 undergoes nuclear fission to release energy.<\/p>\n\n\n\n

9. Which fuel is used in rockets?<\/mark><\/strong>
a) Petrol
b) Diesel
c) Hydrogen + Oxygen
d) Coal gas
Answer:<\/strong> c) Hydrogen + Oxygen
Explanation:<\/strong> Liquid hydrogen and liquid oxygen are used as propellants.<\/p>\n\n\n\n

10. Which is a renewable source of fuel?<\/mark><\/strong>
a) Coal
b) Petroleum
c) Biogas
d) Diesel
Answer:<\/strong> c) Biogas
Explanation:<\/strong> Biogas is produced from biomass, renewable and sustainable.<\/p>\n\n\n\n

11. Wood is considered a:<\/mark><\/strong>
a) Primary fuel
b) Secondary fuel
c) Artificial fuel
d) Synthetic fuel
Answer:<\/strong> a) Primary fuel
Explanation:<\/strong> Wood is a natural, primary source of energy.<\/p>\n\n\n\n

12. Petrol is obtained from:<\/mark><\/strong>
a) Coal distillation
b) Fractional distillation of petroleum
c) Natural gas
d) Biogas
Answer:<\/strong> b) Fractional distillation of petroleum
Explanation:<\/strong> Petroleum products are separated by fractional distillation.<\/p>\n\n\n\n

13. Which of the following is not a petroleum product?<\/mark><\/strong>
a) Diesel
b) Kerosene
c) Coke
d) Petrol
Answer:<\/strong> c) Coke
Explanation:<\/strong> Coke is obtained from coal, not petroleum.<\/p>\n\n\n\n

14. Octane number is related to:<\/mark><\/strong>
a) Quality of diesel
b) Quality of petrol
c) Quality of coal
d) Quality of LPG
Answer:<\/strong> b) Quality of petrol
Explanation:<\/strong> Octane number measures anti-knocking quality of petrol.<\/p>\n\n\n\n

15. The main constituent of CNG is:<\/mark><\/strong>
a) Butane
b) Propane
c) Methane
d) Ethane
Answer:<\/strong> c) Methane
Explanation:<\/strong> CNG mainly contains methane (~90%).<\/p>\n\n\n\n

16. Which gas is used as a domestic fuel in rural areas?<\/mark><\/strong>
a) Coal gas
b) Biogas
c) Natural gas
d) LPG
Answer:<\/strong> b) Biogas
Explanation:<\/strong> Biogas plants in villages produce methane-rich gas.<\/p>\n\n\n\n

17. Which fuel produces least pollution?<\/strong><\/mark>
a) Petrol
b) Coal
c) LPG
d) Hydrogen
Answer:<\/strong> d) Hydrogen
Explanation:<\/strong> Hydrogen produces only water vapor after combustion.<\/p>\n\n\n\n

18. Calorific value of coal is about:<\/strong><\/mark>
a) 15\u201320 kJ\/g
b) 20\u201325 kJ\/g
c) 30\u201335 kJ\/g
d) 40\u201345 kJ\/g
Answer:<\/strong> b) 20\u201325 kJ\/g
Explanation:<\/strong> Average calorific value of coal lies around 20\u201325 kJ\/g.<\/p>\n\n\n\n

19. Which of the following fuels is solid?<\/mark><\/strong>
a) Petrol
b) LPG
c) Wood
d) Natural gas
Answer:<\/strong> c) Wood
Explanation:<\/strong> Solid fuels include coal, wood, coke.<\/p>\n\n\n\n

20. Which gas is a major component of water gas?<\/mark><\/strong>
a) CO and H\u2082
b) CO and CH\u2084
c) CO\u2082 and H\u2082
d) CH\u2084 and H\u2082
Answer:<\/strong> a) CO and H\u2082
Explanation:<\/strong> Water gas is CO + H\u2082, used as industrial fuel.<\/p>\n\n\n\n

21. Producer gas is:<\/mark>
<\/strong>a) CO + H\u2082
b) CO + N\u2082
c) CO\u2082 + O\u2082
d) CH\u2084 + CO\u2082
Answer:<\/strong> b) CO + N\u2082
Explanation:<\/strong> Producer gas is made from coke + air.<\/p>\n\n\n\n

22. Which of the following has maximum energy per gram?<\/mark><\/strong>
a) Petrol
b) Diesel
c) Coal
d) Hydrogen
Answer:<\/strong> d) Hydrogen
Explanation:<\/strong> Hydrogen has highest calorific value.<\/p>\n\n\n\n

23. Which of the following is a non-renewable fuel?<\/mark><\/strong>
a) Biogas
b) Coal
c) Firewood
d) Charcoal
Answer:<\/strong> b) Coal
Explanation:<\/strong> Coal takes millions of years to form.<\/p>\n\n\n\n

24. LPG mainly consists of:<\/mark><\/strong>
a) Butane + Propane
b) Ethane + Methane
c) Butane + Methane
d) Methane + CO\u2082
Answer:<\/strong> a) Butane + Propane
Explanation:<\/strong> LPG is a mixture of butane and propane.<\/p>\n\n\n\n

25. Which gas is commonly known as \u201cmarsh gas\u201d?<\/mark><\/strong>
a) CO\u2082
b) CH\u2084
c) H\u2082
d) CO
Answer:<\/strong> b) CH\u2084
Explanation:<\/strong> Methane is called marsh gas, produced in swamps.<\/p>\n\n\n\n

26. The primary constituent of coal is:<\/mark><\/strong>
a) Carbon
b) Hydrogen
c) Nitrogen
d) Oxygen
Answer:<\/strong> a) Carbon
Explanation:<\/strong> Coal is mainly carbon with small amounts of hydrogen, nitrogen, sulfur, and oxygen.<\/p>\n\n\n\n

27. The purest form of coal is:<\/mark><\/strong>
a) Lignite
b) Bituminous
c) Anthracite
d) Peat
Answer:<\/strong> c) Anthracite
Explanation:<\/strong> Anthracite has the highest carbon content (~90%) and highest calorific value.<\/p>\n\n\n\n

28. Which variety of coal has the least carbon content?<\/mark><\/strong>
a) Lignite
b) Peat
c) Bituminous
d) Anthracite
Answer:<\/strong> b) Peat
Explanation:<\/strong> Peat is the lowest grade, with least carbon (~50\u201360%).<\/p>\n\n\n\n

29. Which gas is formed when coal burns with insufficient oxygen?<\/mark><\/strong>
a) CO\u2082
b) CH\u2084
c) CO
d) SO\u2082
Answer:<\/strong> c) CO
Explanation:<\/strong> Incomplete combustion of carbon forms poisonous carbon monoxide.<\/p>\n\n\n\n

30. Destructive distillation of coal gives:<\/mark><\/strong>
a) Coke, coal tar, coal gas
b) Petrol, kerosene, diesel
c) Coke, methane, hydrogen
d) Graphite, diamond, soot
Answer:<\/strong> a) Coke, coal tar, coal gas
Explanation:<\/strong> Heating coal in absence of air produces coke, coal tar, and coal gas.<\/p>\n\n\n\n

31. Which petroleum fraction has the lowest boiling point?<\/mark><\/strong>
a) Diesel
b) Petrol
c) Kerosene
d) Lubricating oil
Answer:<\/strong> b) Petrol
Explanation:<\/strong> Petrol boils at ~40\u2013200\u00b0C, lower than kerosene and diesel.<\/p>\n\n\n\n

32. Diesel is obtained from petroleum by:<\/mark><\/strong>
a) Filtration
b) Distillation
c) Fractional distillation
d) Condensation
Answer:<\/strong> c) Fractional distillation
Explanation:<\/strong> Petroleum is separated into fractions based on boiling points.<\/p>\n\n\n\n

33. The main constituent of natural gas is:<\/mark><\/strong>
a) Methane
b) Ethane
c) Propane
d) Butane
Answer:<\/strong> a) Methane
Explanation:<\/strong> Natural gas contains ~85\u201395% methane.<\/p>\n\n\n\n

34. Which fuel is called \u201cblue fuel\u201d?<\/mark><\/strong>
a) Coal gas
b) Biogas
c) Natural gas
d) LPG
Answer:<\/strong> c) Natural gas
Explanation:<\/strong> Natural gas burns with a blue flame, hence \u201cblue fuel\u201d.<\/p>\n\n\n\n

35. CNG stands for:<\/mark><\/strong>
a) Compressed Natural Gas
b) Combined Natural Gas
c) Common Natural Gas
d) Concentrated Natural Gas
Answer:<\/strong> a) Compressed Natural Gas
Explanation:<\/strong> CNG is methane compressed at high pressure.<\/p>\n\n\n\n

36. Biogas is mainly composed of:<\/mark><\/strong>
a) CO\u2082 + H\u2082
b) CH\u2084 + CO\u2082
c) CO + N\u2082
d) C\u2082H\u2086 + CH\u2084
Answer:<\/strong> b) CH\u2084 + CO\u2082
Explanation:<\/strong> Biogas contains ~55\u201370% methane and ~30\u201340% CO\u2082.<\/p>\n\n\n\n

37. Biogas is produced by:<\/mark><\/strong>
a) Fermentation
b) Aerobic decomposition
c) Anaerobic decomposition
d) Oxidation
Answer:<\/strong> c) Anaerobic decomposition
Explanation:<\/strong> Methanogens break down biomass in absence of oxygen to produce methane.<\/p>\n\n\n\n

38. Which of the following is a cleaner fuel?<\/mark><\/strong>
a) Coal
b) Wood
c) LPG
d) Diesel
Answer:<\/strong> c) LPG
Explanation:<\/strong> LPG burns completely and produces less smoke.<\/p>\n\n\n\n

39. Which of the following gases causes \u201ccoal mine explosions\u201d?<\/mark><\/strong>
a) CO\u2082
b) CH\u2084
c) H\u2082
d) SO\u2082
Answer:<\/strong> b) CH\u2084
Explanation:<\/strong> Methane (firedamp) accumulates in coal mines, causing explosions.<\/p>\n\n\n\n

40. Which fraction of petroleum is used as fuel for aircraft?<\/mark><\/strong>
a) Kerosene
b) Diesel
c) Petrol
d) Naphtha
Answer:<\/strong> a) Kerosene
Explanation:<\/strong> Aviation turbine fuel (ATF) is a purified form of kerosene.<\/p>\n\n\n\n

41. Which of the following is a non-conventional fuel?<\/mark><\/strong>
a) Biogas
b) Coal
c) Diesel
d) Petrol
Answer:<\/strong> a) Biogas
Explanation:<\/strong> Non-conventional renewable fuels include biogas, solar, wind.<\/p>\n\n\n\n

42. The major constituent of coal gas is:<\/mark><\/strong>
a) CO + CH\u2084 + H\u2082
b) N\u2082 + H\u2082
c) CO\u2082 + O\u2082
d) SO\u2082 + CH\u2084
Answer:<\/strong> a) CO + CH\u2084 + H\u2082
Explanation:<\/strong> Coal gas is a mixture of CO, CH\u2084, H\u2082.<\/p>\n\n\n\n

43. Which of the following gases is absent in natural gas?<\/mark><\/strong>
a) Methane
b) Ethane
c) Carbon dioxide
d) Nitrogen
Answer:<\/strong> d) Nitrogen
Explanation:<\/strong> Natural gas has mainly hydrocarbons with little CO\u2082 but no nitrogen.<\/p>\n\n\n\n

44. What is the calorific value of biogas?<\/strong><\/mark>
a) 10\u201315 MJ\/m\u00b3
b) 20\u201325 MJ\/m\u00b3
c) 30\u201335 MJ\/m\u00b3
d) 40\u201345 MJ\/m\u00b3
Answer:<\/strong> b) 20\u201325 MJ\/m\u00b3
Explanation:<\/strong> Biogas has moderate calorific value due to CH\u2084 + CO\u2082 composition.<\/p>\n\n\n\n

45. Which process is used for separating petroleum into components?<\/mark><\/strong>
a) Destructive distillation
b) Fractional distillation
c) Sublimation
d) Electrolysis
Answer:<\/strong> b) Fractional distillation
Explanation:<\/strong> Different hydrocarbons separate according to boiling points.<\/p>\n\n\n\n

46. LPG is safer than coal because:<\/mark><\/strong>
a) It is lighter than air and disperses
b) It has no carbon
c) It has no hydrogen
d) It contains nitrogen
Answer:<\/strong> a) It is lighter than air and disperses
Explanation:<\/strong> LPG disperses quickly if leaked, reducing suffocation risk.<\/p>\n\n\n\n

47. The \u201cgreenhouse gas\u201d present in biogas is:<\/strong><\/mark>
a) Methane
b) Oxygen
c) Nitrogen
d) Helium
Answer:<\/strong> a) Methane
Explanation:<\/strong> Methane is a potent greenhouse gas and a major component of biogas.<\/p>\n\n\n\n

48. Which petroleum product is used in road construction?<\/mark><\/strong>
a) Paraffin
b) Bitumen
c) Diesel
d) Petrol
Answer:<\/strong> b) Bitumen
Explanation:<\/strong> Bitumen is the residue after fractional distillation of petroleum.<\/p>\n\n\n\n

49. What is the main advantage of CNG over petrol and diesel?<\/mark><\/strong>
a) Lower calorific value
b) Higher pollution
c) Cheaper and cleaner
d) Difficult storage
Answer:<\/strong> c) Cheaper and cleaner
Explanation:<\/strong> CNG burns efficiently with less pollution and is cheaper.<\/p>\n\n\n\n

50. Biogas plants use which type of bacteria?<\/mark><\/strong>
a) Aerobic bacteria
b) Anaerobic methanogens
c) Sulfur bacteria
d) Nitrifying bacteria
Answer:<\/strong> b) Anaerobic methanogens
Explanation:<\/strong> Methanogens (anaerobic bacteria) convert organic matter into methane.<\/p>\n\n\n\n

51. Fuels that occur in nature are called:<\/mark><\/strong>
a) Primary fuels
b) Secondary fuels
c) Synthetic fuels
d) Derived fuels
Answer:<\/strong> a) Primary fuels
Explanation:<\/strong> Primary fuels like coal, wood, and natural gas are found naturally. Secondary fuels like petrol are refined.<\/p>\n\n\n\n

52. Petrol, diesel, and LPG are examples of:<\/mark><\/strong>
a) Primary fuels
b) Secondary fuels
c) Solid fuels
d) Non-combustible fuels
Answer:<\/strong> b) Secondary fuels
Explanation:<\/strong> These are derived by refining crude petroleum \u2192 hence secondary fuels.<\/p>\n\n\n\n

53. Which is a solid fuel?<\/mark><\/strong>
a) Kerosene
b) Coal
c) Petrol
d) LPG
Answer:<\/strong> b) Coal
Explanation:<\/strong> Solid fuels include coal, coke, wood, etc.<\/p>\n\n\n\n

54. A fuel is said to be efficient when:<\/mark><\/strong>
a) It has low calorific value
b) It has high calorific value
c) It produces more smoke
d) It burns slowly
Answer:<\/strong> b) It has high calorific value
Explanation:<\/strong> Efficiency of a fuel depends on high energy per unit mass.<\/p>\n\n\n\n

55. Which of the following is a liquid fuel?<\/mark><\/strong>
a) Wood
b) Coke
c) Petrol
d) CNG
Answer:<\/strong> c) Petrol
Explanation:<\/strong> Petrol, diesel, kerosene are liquid fuels.<\/p>\n\n\n\n

56. Which of the following is a gaseous fuel?<\/mark><\/strong>
a) Coal
b) Kerosene
c) LPG
d) Charcoal
Answer:<\/strong> c) LPG
Explanation:<\/strong> LPG, CNG, natural gas are gaseous fuels.<\/p>\n\n\n\n

57. Which property of a fuel is most important for its efficiency?<\/strong><\/mark>
a) Density
b) Calorific value
c) State of matter
d) Color
Answer:<\/strong> b) Calorific value
Explanation:<\/strong> Higher calorific value = more heat released = better efficiency.<\/p>\n\n\n\n

58. Which of the following fuels is renewable?<\/mark><\/strong>
a) Coal
b) Biogas
c) Petrol
d) Diesel
Answer:<\/strong> b) Biogas
Explanation:<\/strong> Biogas is produced from biomass (cow dung, waste) and is renewable.<\/p>\n\n\n\n

59. Which gas in fuels causes acid rain when burnt?<\/mark><\/strong>
a) CO
b) CH\u2084
c) SO\u2082
d) H\u2082
Answer:<\/strong> c) SO\u2082
Explanation:<\/strong> Sulfur dioxide from coal\/diesel combustion forms H\u2082SO\u2084 in rain \u2192 acid rain.<\/p>\n\n\n\n

60. Which fuel is widely used in thermal power plants?<\/mark><\/strong>
a) Diesel
b) Coal
c) Biogas
d) Hydrogen
Answer:<\/strong> b) Coal
Explanation:<\/strong> Coal is the most common fuel in power generation.<\/p>\n\n\n\n

61. Which fuel is better for automobiles due to high octane rating?<\/mark><\/strong>
a) Coal
b) Petrol
c) Diesel
d) Hydrogen
Answer:<\/strong> b) Petrol
Explanation:<\/strong> Petrol has higher octane number, preventing knocking in engines.<\/p>\n\n\n\n

62. Which fuel is commonly used in rural kitchens?<\/mark><\/strong>
a) Biogas
b) Diesel
c) Coal gas
d) CNG
Answer:<\/strong> a) Biogas
Explanation:<\/strong> Biogas plants in villages provide cheap cooking fuel.<\/p>\n\n\n\n

63. Which gas causes global warming the most?<\/mark><\/strong>
a) Oxygen
b) Methane
c) Carbon dioxide
d) Nitrogen
Answer:<\/strong> c) Carbon dioxide
Explanation:<\/strong> CO\u2082 is the primary greenhouse gas from fuel burning.<\/p>\n\n\n\n

64. Which fuel is preferred for domestic cooking in urban areas?<\/mark><\/strong>
a) Coal
b) Wood
c) LPG
d) Kerosene
Answer:<\/strong> c) LPG
Explanation:<\/strong> LPG is smokeless, clean, and efficient fuel for kitchens.<\/p>\n\n\n\n

65. Which form of energy is stored in fuels?<\/mark><\/strong>
a) Nuclear energy
b) Thermal energy
c) Chemical energy
d) Electrical energy
Answer:<\/strong> c) Chemical energy
Explanation:<\/strong> Combustion of fuel releases stored chemical energy as heat.<\/p>\n\n\n\n

66. Which pollutant is mainly responsible for smog?<\/mark><\/strong>
a) SO\u2082
b) NO\u2093 (oxides of nitrogen)
c) CO\u2082
d) O\u2082
Answer:<\/strong> b) NO\u2093 (oxides of nitrogen)
Explanation:<\/strong> NO and NO\u2082 react with hydrocarbons to form photochemical smog.<\/p>\n\n\n\n

67. Which pollutant from fuels is most dangerous to human health?<\/mark><\/strong>
a) CO
b) O\u2082
c) H\u2082
d) N\u2082
Answer:<\/strong> a) CO
Explanation:<\/strong> CO binds with hemoglobin to form carboxyhemoglobin \u2192 reduces oxygen transport.<\/p>\n\n\n\n

68. Which fuel produces the least smoke?<\/mark><\/strong>
a) Coal
b) Diesel
c) LPG
d) Wood
Answer:<\/strong> c) LPG
Explanation:<\/strong> LPG burns completely and produces negligible smoke.<\/p>\n\n\n\n

69. The harmful effect of incomplete combustion of fuels is:<\/mark><\/strong>
a) More heat
b) Less pollution
c) CO emission
d) Oxygen release
Answer:<\/strong> c) CO emission
Explanation:<\/strong> Incomplete combustion releases toxic CO gas.<\/p>\n\n\n\n

70. Which fuel is known as \u201cclean fuel\u201d?<\/mark><\/strong>
a) Coal
b) Diesel
c) CNG
d) Wood
Answer:<\/strong> c) CNG
Explanation:<\/strong> CNG (methane) produces very low pollution.<\/p>\n\n\n\n

71. The calorific value of hydrogen is about:<\/mark><\/strong>
a) 20 kJ\/g
b) 30 kJ\/g
c) 50 kJ\/g
d) 150 kJ\/g
Answer:<\/strong> d) 150 kJ\/g
Explanation:<\/strong> Hydrogen has the highest calorific value (~150 kJ\/g).<\/p>\n\n\n\n

72. Which gas causes respiratory problems when fuels are burnt?<\/mark><\/strong>
a) N\u2082
b) CO
c) SO\u2082
d) H\u2082O vapor
Answer:<\/strong> c) SO\u2082
Explanation:<\/strong> Sulfur dioxide causes asthma, bronchitis, and acid rain.<\/p>\n\n\n\n

73. Which of the following is a non-polluting fuel?<\/mark><\/strong>
a) Petrol
b) LPG
c) Hydrogen
d) Diesel
Answer:<\/strong> c) Hydrogen
Explanation:<\/strong> Hydrogen produces only water after combustion.<\/p>\n\n\n\n

74. Which property makes LPG suitable as a domestic fuel?<\/strong><\/mark>
a) High pressure
b) Easy liquefaction & high calorific value
c) Heavy gas
d) Forms smoke
Answer:<\/strong> b) Easy liquefaction & high calorific value
Explanation:<\/strong> LPG can be stored in cylinders and has high energy density.<\/p>\n\n\n\n

75. Which fuel causes minimum CO\u2082 emission per unit energy?<\/mark><\/strong>
a) Coal
b) Diesel
c) Natural gas
d) Petrol
Answer:<\/strong> c) Natural gas
Explanation:<\/strong> Methane (CH\u2084) has the highest H:C ratio, giving least CO\u2082 emission.<\/p>\n\n\n\n

76. Which of the following is considered an alternative fuel?
<\/mark><\/strong>a) Petrol
b) Coal
c) Ethanol
d) Diesel
Answer:<\/strong> c) Ethanol
Explanation:<\/strong> Ethanol (biofuel) is renewable and reduces dependence on fossil fuels.<\/p>\n\n\n\n

77. Gasohol is a mixture of:<\/mark><\/strong>
a) Petrol + Kerosene
b) Petrol + Ethanol
c) Diesel + Ethanol
d) Petrol + Methane
Answer:<\/strong> b) Petrol + Ethanol
Explanation:<\/strong> Gasohol = 90% petrol + 10% ethanol, used in cars.<\/p>\n\n\n\n

78. Biodiesel is mainly produced from:<\/mark><\/strong>
a) Coal tar
b) Vegetable oils and fats
c) Petroleum residues
d) Natural gas
Answer:<\/strong> b) Vegetable oils and fats
Explanation:<\/strong> Biodiesel is made by transesterification of vegetable oils.<\/p>\n\n\n\n

79. Which country is the largest producer of ethanol fuel?<\/mark><\/strong>
a) India
b) USA
c) Brazil
d) China
Answer:<\/strong> c) Brazil
Explanation:<\/strong> Brazil produces ethanol from sugarcane at a large scale.<\/p>\n\n\n\n

80. Hydrogen is called a clean fuel because:<\/mark><\/strong>
a) It has high density
b) It produces only water
c) It produces CO\u2082
d) It burns with smoke
Answer:<\/strong> b) It produces only water
Explanation:<\/strong> Hydrogen combustion \u2192 H\u2082O (no greenhouse gases).<\/p>\n\n\n\n

81. Which is used as a rocket fuel?<\/strong><\/mark>
a) LPG
b) Hydrogen + Oxygen
c) Coal gas
d) Petrol
Answer:<\/strong> b) Hydrogen + Oxygen
Explanation:<\/strong> Rockets use liquid hydrogen + liquid oxygen.<\/p>\n\n\n\n

82. The main disadvantage of hydrogen fuel is:<\/mark><\/strong>
a) High pollution
b) Low calorific value
c) Storage and transportation difficulty
d) Slow combustion
Answer:<\/strong> c) Storage and transportation difficulty
Explanation:<\/strong> Hydrogen is light, highly flammable, and hard to store.<\/p>\n\n\n\n

83. Which fuel is used in fuel cells?<\/mark><\/strong>
a) Coal
b) Diesel
c) Hydrogen
d) LPG
Answer:<\/strong> c) Hydrogen
Explanation:<\/strong> Fuel cells generate electricity from hydrogen + oxygen.<\/p>\n\n\n\n

84. Which renewable fuel can be produced from agricultural waste?<\/mark><\/strong>
a) CNG
b) Biogas
c) Diesel
d) Petrol
Answer:<\/strong> b) Biogas
Explanation:<\/strong> Anaerobic bacteria decompose agricultural waste \u2192 methane.<\/p>\n\n\n\n

85. Which of the following is NOT an advantage of CNG?<\/mark><\/strong>
a) Cheaper than petrol
b) Lower pollution
c) Easy storage at normal pressure
d) High octane rating
Answer:<\/strong> c) Easy storage at normal pressure
Explanation:<\/strong> CNG must be compressed at high pressure \u2192 storage is not easy.<\/p>\n\n\n\n

86. Which of the following is used as a fuel in nuclear power plants?<\/mark><\/strong>
a) Thorium-232
b) Uranium-235
c) Plutonium-239
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> U-235, Pu-239, Th-232 are nuclear fuels.<\/p>\n\n\n\n

87. The main advantage of nuclear fuel is:<\/mark><\/strong>
a) No radiation
b) Very high energy per unit mass
c) Cheap construction
d) Easily available
Answer:<\/strong> b) Very high energy per unit mass
Explanation:<\/strong> Nuclear fuels give millions of times more energy than chemical fuels.<\/p>\n\n\n\n

88. Which type of energy is obtained from fuels?<\/mark><\/strong>
a) Mechanical
b) Chemical
c) Nuclear
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> Chemical fuels \u2192 combustion; nuclear fuels \u2192 fission\/fusion.<\/p>\n\n\n\n

89. Which of the following is a fossil fuel?<\/mark><\/strong>
a) Biogas
b) Petrol
c) Hydrogen
d) Biodiesel
Answer:<\/strong> b) Petrol
Explanation:<\/strong> Petrol is obtained from crude petroleum.<\/p>\n\n\n\n

90. The gas produced in landfills is:<\/mark><\/strong>
a) CO\u2082
b) CH\u2084
c) H\u2082
d) N\u2082
Answer:<\/strong> b) CH\u2084
Explanation:<\/strong> Anaerobic decomposition in landfills produces methane.<\/p>\n\n\n\n

91. Which type of fuel is ethanol-blended petrol?<\/mark><\/strong>
a) Fossil fuel
b) Renewable + non-renewable hybrid
c) Only renewable
d) Only fossil
Answer:<\/strong> b) Renewable + non-renewable hybrid
Explanation:<\/strong> Petrol (fossil) + Ethanol (biofuel) = hybrid fuel.<\/p>\n\n\n\n

92. Which of the following is NOT a greenhouse gas?<\/mark><\/strong>
a) CO\u2082
b) CH\u2084
c) SO\u2082
d) N\u2082O
Answer:<\/strong> c) SO\u2082
Explanation:<\/strong> SO\u2082 causes acid rain, but not a greenhouse gas.<\/p>\n\n\n\n

93. Which fuel is considered \u201ccarbon neutral\u201d?<\/mark><\/strong>
a) Biogas
b) Diesel
c) Petrol
d) LPG
Answer:<\/strong> a) Biogas
Explanation:<\/strong> CO\u2082 released during combustion is balanced by CO\u2082 absorbed during biomass growth.<\/p>\n\n\n\n

94. The main fuel used in gas turbines is:<\/mark><\/strong>
a) Petrol
b) Diesel
c) Kerosene
d) LPG
Answer:<\/strong> c) Kerosene
Explanation:<\/strong> Aviation turbines use kerosene as jet fuel.<\/p>\n\n\n\n

95. Which fuel is mainly used in space shuttles?<\/mark><\/strong>
a) Diesel
b) Hydrogen + Oxygen
c) LPG
d) Coal gas
Answer:<\/strong> b) Hydrogen + Oxygen
Explanation:<\/strong> Rockets use cryogenic hydrogen and oxygen.<\/p>\n\n\n\n

96. The main product formed when natural gas burns completely:<\/mark><\/strong>
a) CO
b) CO\u2082 + H\u2082O
c) SO\u2082
d) H\u2082 only
Answer:<\/strong> b) CO\u2082 + H\u2082O
Explanation:<\/strong> Complete combustion of methane \u2192 CO\u2082 + H\u2082O.<\/p>\n\n\n\n

97. Which of the following is a disadvantage of fossil fuels?<\/mark><\/strong>
a) Limited reserves
b) Air pollution
c) Greenhouse effect
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Fossil fuels cause pollution, climate change, and are non-renewable.<\/p>\n\n\n\n

98. The \u201ccalorific value\u201d of a fuel represents:<\/mark><\/strong>
a) Amount of carbon
b) Amount of ash left
c) Heat produced per unit mass
d) Heat absorbed by water
Answer:<\/strong> c) Heat produced per unit mass
Explanation:<\/strong> It measures efficiency of a fuel.<\/p>\n\n\n\n

99. The best alternative fuel for future vehicles is:<\/mark><\/strong>
a) Hydrogen fuel
b) Petrol
c) Coal gas
d) Diesel
Answer:<\/strong> a) Hydrogen fuel
Explanation:<\/strong> Hydrogen is renewable, abundant, and produces no pollution.<\/p>\n\n\n\n

100. Which of the following is the main challenge with alternative fuels?<\/mark><\/strong>
a) Low availability
b) High cost of technology
c) Storage and safety issues
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Alternative fuels face cost, storage, and technological limitations despite being eco-friendly.<\/p>\n","protected":false},"excerpt":{"rendered":"

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