Sources of Energy MCQ
1. Which of the following is a non-renewable source of energy?
(a) Wood
(b) Sun
(c) Fossil fuels
(d) Wind
Ans. (c) Fossil fuels
Explanation: It takes millions of Years of the formation of fossil fuels. So, they cannot be renewed in foreseeable future.
2. Acid rain happens because
(a) sun leads to heating of upper layer of atmosphere
(b) burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere
(c) electrical charges are produced due to friction amongst clouds
(d) earth atmosphere contains acids
Ans. (b) burning of fossil fuels release oxides of carbon, nitrogen and Sulphur in the atmosphere
Explanation: Oxides of carbon, nitrogen and sulphur mix with rain water to form acids. This causes acid rain.
3. Fuel used in thermal power plants is
(a) water
(b) uranium
(c) biomass
(d) fossil fuels
Ans. (d) fossil fuels
Explanation: Coal is the major fuel used in thermal power plants. Additionally, natural gas and petroleum gas are also used.
4. In a hydro power plant
(a) Potential energy possessed by stored water is converted into electricity
(b) Kinetic energy possessed by stored water is converted into potential energy
(c) Electricity is extracted from water
(d) Water is converted into steam to produce electricity
Ans. (a) Potential energy possessed by stored water is converted into electricity
Explanation: Water is stored behind dams. The stored water has potential energy. When water is released from the dam; Potential energy changes into kinetic energy. This kinetic energy is utilized to turn the turbine to generate electricity.
5. Which is the ultimate source of energy?
(a) Water
(b) Sun
(c) Uranium
(d) Fossil fuels
Ans. (b) Sun
Explanation: Fossil fuels were made from biomass and biomass is made because of photosynthesis. We know that solar energy is converted into biomass through photosynthesis.
Water cycle is driven by sun and hence kinetic energy in water is because of sun. Hence, it is said that sun is the ultimate source of energy.
6. Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?
(a) Nuclear energy
(b) Thermal energy
(c) Solar energy
(d) Geothermal energy
Ans. (c) Solar energy
7. Ocean thermal energy is due to
(a) energy stored by waves in the ocean
(b) temperature difference at different levels in the ocean
(c) pressure difference at different levels in the ocean
(d) tides arising out in the ocean
Ans. (b) temperature difference at different levels in the ocean
Explanation: Energy from warm surface is used to boil a volatile liquid. Vapours of this liquid are utilized to turn the turbine. Then vapours are channelized to deeper oceans so that they can cool down.
8. The major problem in harnessing nuclear energy is how to
(a) split nuclei?
(b) sustain the reaction?
(c) dispose off spent fuel safely?
(d) convert nuclear energy into electrical energy?
Ans. (c) dispose off spent fuel safely?
Explanation: Spent fuel from a nuclear plant contains highly radioactive material. This can be very harmful for living beings and for the environment.
