Class 10 Science

Sources of Energy NCERT Exemplar Problems

Multiple Choice Questions

Question 1: Which of the following is a non-renewable source of energy?

  1. Wood
  2. Sun
  3. Fossil fuels
  4. Wind

Answer: (c) Fossil fuels

Question 2: Acid rain happens because

  1. Sun leads to heating of upper layer of atmosphere
  2. Burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere
  3. Electrical charges are produced due to friction amongst clouds
  4. Earth atmosphere contains acids

Answer: (b) Burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere

Question 3: Fuel used in thermal power plants is

  1. Water
  2. Uranium
  3. Biomass
  4. Fossil fuels

Answer: (d) Fossil fuels

Question 4: In a hydro power plant

  1. Potential energy possessed by stored water is converted into electricity
  2. Kinetic energy possessed by stored water is converted into potential energy
  3. Electricity is extracted from water
  4. Water is converted into steam to produce electricity

Answer: (b) Kinetic energy possessed by stored water is converted into potential energy

Question 5: Which is the ultimate source of energy?

  1. Water
  2. Sun
  3. Uranium
  4. Fossil fuels

Answer: (b) Sun

Question 6: Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?

  1. Nuclear energy
  2. Thermal energy
  3. Solar energy
  4. Geothermal energy

Answer: (c) Solar energy

Question 7: Ocean thermal energy is due to

  1. Energy stored by waves in the ocean
  2. Temperature difference at different levels in the ocean
  3. Pressure difference at different levels in the ocean
  4. Tides arising out in the ocean

Answer: (b) Temperature difference at different levels in the ocean

Question 8: The major problem in harnessing nuclear energy is how to

  1. Split nuclei?
  2. Sustain the reaction?
  3. Dispose off spent fuel safely?
  4. Convert nuclear energy into electrical energy?

Answer: (c) Dispose off spent fuel safely

Question 9: Which part of the solar cooker is responsible for green house effect?

  1. Coating with black colour inside the box
  2. Mirror
  3. Glass sheet
  4. Outer cover of the solar cooker

Answer: (c) Glass sheet

Question 10: The main constituent of biogas is

  1. Methane
  2. Carbon dioxide
  3. Hydrogen
  4. Hydrogen sulphide

Answer: (a) Methane

Question 11: The power generated in a windmill

  1. Is more in rainy season since damp air would mean more air mass hitting the blades
  2. Depends on the height of the tower
  3. Depends on wind velocity
  4. Can be increased by planting tall trees close to the tower

Answer: (c) Depends on wind velocity

Question 12: Choose the correct statement

  1. Sun can be taken as an inexhaustible source of energy
  2. There is infinite storage of fossil fuel inside the earth
  3. Hydro and wind energy plants are non polluting sources of energy
  4. Waste from a nuclear power plant can be easily disposed off

Answer: Both (a) and (c)