Sources of Energy Part 4: MCQs (Q76–Q100)
🔋 Sources of Energy – MCQs (Class 10 Science, NCERT)
🔹 Part 4: Questions 76–100
Q76. Which of the following is an example of biomass energy?
A) Nuclear fuel
B) Dung cakes
C) Natural gas
D) Coal
Correct Answer: B) Dung cakes
Explanation:
- ✅ B) Biomass → Cow dung, crop residue, wood.
- A, C, D → Non-biomass fuels.
Q77. Which of these is NOT a disadvantage of wind energy?
A) High installation cost
B) Noise pollution
C) Air pollution
D) Irregular supply
Correct Answer: C) Air pollution
Explanation:
- ✅ C) Wind is eco-friendly, does not pollute air.
Q78. Which of these is NOT a fossil fuel?
A) Coal
B) Petroleum
C) Biogas
D) Natural gas
Correct Answer: C) Biogas
Explanation:
- ✅ C) Biogas is renewable, not formed from fossils.
Q79. Which of the following is NOT a characteristic of ideal fuel?
A) High calorific value
B) Easy storage
C) Produces more smoke
D) Cheap
Correct Answer: C) Produces more smoke
Explanation:
- ✅ C) A good fuel must be smokeless.
Q80. Which is NOT a disadvantage of hydroelectric power plants?
A) Submergence of land
B) Displacement of people
C) Renewable source of energy
D) High construction cost
Correct Answer: C) Renewable source of energy
Explanation:
- ✅ C) Being renewable is an advantage, not a drawback.
Q81. Which of the following is a renewable source of energy?
A) Petroleum
B) Coal
C) Natural gas
D) Wind
Correct Answer: D) Wind
Explanation:
- ✅ D) Wind is renewable, while A–C are fossil fuels.
Q82. The main disadvantage of solar cookers is:
A) No fuel required
B) Pollution-free
C) Cannot work on cloudy days
D) Easy to use
Correct Answer: C) Cannot work on cloudy days
Explanation:
- ✅ C) Dependence on sunlight limits their use.
Q83. Which of these is NOT used in nuclear reactors?
A) Uranium-235
B) Thorium-232
C) Plutonium-239
D) Methane
Correct Answer: D) Methane
Explanation:
- ✅ D) Methane is a gas fuel, not a nuclear fuel.
Q84. The disadvantage of tidal energy is:
A) Renewable
B) Location-specific
C) Pollution-free
D) Eco-friendly
Correct Answer: B) Location-specific
Explanation:
- ✅ B) Can only be harnessed in coastal areas with high tides.
Q85. The unit of calorific value of a fuel is:
A) J/kg
B) kWh
C) kJ/mol
D) J/m²
Correct Answer: A) J/kg
Explanation:
- ✅ A) Energy released per kilogram of fuel.
Q86. Which of the following is the ultimate source of almost all energy on Earth?
A) Coal
B) Sun
C) Petroleum
D) Uranium
Correct Answer: B) Sun
Explanation:
- ✅ B) Sun → Indirectly responsible for wind, hydro, biomass.
Q87. The source of energy in stars is:
A) Nuclear fission
B) Nuclear fusion
C) Combustion
D) Radioactive decay
Correct Answer: B) Nuclear fusion
Explanation:
- ✅ B) Fusion of hydrogen nuclei releases energy in stars.
Q88. Which of the following is a renewable but conventional energy source?
A) Wind
B) Tidal
C) Hydro power
D) Geothermal
Correct Answer: C) Hydro power
Explanation:
- ✅ C) Hydropower is renewable but has been used traditionally.
Q89. The main advantage of biogas over cow dung cakes is:
A) Produces smoke
B) Lower efficiency
C) Burns without smoke, high calorific value
D) Non-renewable
Correct Answer: C) Burns without smoke, high calorific value
Explanation:
- ✅ C) Biogas → Efficient and clean fuel compared to dung cakes.
Q90. Which of the following is a limitation of nuclear power plants?
A) Low energy density
B) Radioactive waste disposal
C) Produces greenhouse gases
D) Cannot run continuously
Correct Answer: B) Radioactive waste disposal
Explanation:
- ✅ B) Waste is hazardous for thousands of years.
Q91. Which source of energy is NOT derived from the Sun?
A) Wind
B) Hydro power
C) Geothermal
D) Biomass
Correct Answer: C) Geothermal
Explanation:
- ✅ C) Geothermal comes from Earth’s interior, not solar origin.
Q92. Which energy source is associated with greenhouse effect?
A) Coal
B) Petroleum
C) Natural gas
D) All of these
Correct Answer: D) All of these
Explanation:
- ✅ D) All fossil fuels release CO₂, causing greenhouse effect.
Q93. Which is a disadvantage of ocean wave energy?
A) Renewable
B) Location-specific
C) Non-polluting
D) Inexhaustible
Correct Answer: B) Location-specific
Explanation:
- ✅ B) Wave energy needs suitable coastal locations.
Q94. The most abundant non-conventional energy source in India is:
A) Geothermal
B) Solar
C) Tidal
D) Nuclear
Correct Answer: B) Solar
Explanation:
- ✅ B) India gets abundant sunlight throughout the year.
Q95. Which of the following is NOT a drawback of fossil fuels?
A) Limited reserves
B) High calorific value
C) Air pollution
D) Greenhouse gas emission
Correct Answer: B) High calorific value
Explanation:
- ✅ B) High calorific value is an advantage.
Q96. Which energy source produces harmful radioactive waste?
A) Nuclear power
B) Thermal power
C) Solar power
D) Wind power
Correct Answer: A) Nuclear power
Explanation:
- ✅ A) Nuclear plants produce radioactive by-products.
Q97. Which type of mirror is used in solar furnace?
A) Convex
B) Concave
C) Plane
D) Cylindrical
Correct Answer: B) Concave
Explanation:
- ✅ B) Concave mirrors concentrate sunlight at focus, producing high heat.
Q98. Which of these is a conventional energy source?
A) Biogas
B) Wind
C) Petroleum
D) Solar
Correct Answer: C) Petroleum
Explanation:
- ✅ C) Petroleum is conventional fossil fuel.
Q99. Which fuel has the lowest calorific value?
A) Biogas
B) Coal
C) Wood
D) Hydrogen
Correct Answer: C) Wood
Explanation:
- ✅ C) Wood ~17 kJ/g, lower than coal, gas, hydrogen.
Q100. Which source of energy is considered the best alternative for fossil fuels in the future?
A) Nuclear fusion
B) Coal
C) Petroleum
D) Natural gas
Correct Answer: A) Nuclear fusion
Explanation:
- ✅ A) Fusion → Clean, enormous energy, no greenhouse gases.
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