Q1Multiple choice
Which of the following is a non-renewable source of energy?
- (a)Wood
- (b)Sun
- (c)Fossil fuels
- (d)Wind
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(c) Fossil fuels
Chapter 14 – Sources Of Energy
Class 10 Science · 29 questions · 29 with answers
Questions
Q2Multiple choice
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
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(b) burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere
Q3Multiple choice
Fuel used in thermal power plants is
- (a)water
- (b)uranium
- (c)biomass
- (d)fossil fuels
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(d) fossil fuels
Q4Multiple choice
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
Show answer
(a) Potential energy possessed by stored water is converted into electricity
Q5Multiple choice
Which is the ultimate source of energy?
- (a)Water
- (b)Sun
- (c)Uranium
- (d)Fossil fuels
Show answer
(b) Sun
Q6Multiple choice
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
Show answer
(c) Solar energy
Q7Multiple choice
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
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(b) temperature difference at different levels in the ocean
Q8Multiple choice
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?
Show answer
(c) dispose off spent fuel safely?
Q9Multiple choice
Which part of the solar cooker is responsible for green house effect?
- (a)Coating with black colour inside the box
- (b)Mirror
- (c)Glass sheet
- (d)Outer cover of the solar cooker
Show answer
(c) Glass sheet
Q10Multiple choice
The main constituent of biogas is
- (a)methane
- (b)carbon dioxide
- (c)hydrogen
- (d)hydrogen sulphide
Show answer
(a) methane
Q11Multiple choice
The power generated in a windmill
- (a)is more in rainy season since damp air would mean more air mass hitting the blades
- (b)depends on the height of the tower
- (c)depends on wind velocity
- (d)can be increased by planting tall trees close to the tower SOURCES OF ENERGY 103
Show answer
(c) depends on wind velocity
Q12Multiple choice
Choose the correct statement
- (a)Sun can be taken as an inexhaustible source of energy
- (b)There is infinite storage of fossil fuel inside the earth
- (c)Hydro and wind energy plants are non polluting sources of energy
- (d)Waste from a nuclear power plant can be easily disposed off
Show answer
(a) Sun can be taken as an inexhaustible source of energy
Q13Multiple choice
In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because
- (a)its temperature increases
- (b)larger amount of potential energy is converted into kinetic energy
- (c)the electricity content of water increases with height
- (d)more water molecules dissociate into ions
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(b) larger amount of potential energy is converted into kinetic energy
Q14Multiple choice
Choose the incorrect statement regarding wind power
- (a)It is expected to harness wind power to minimum in open space
- (b)The potential energy content of wind blowing at high altitudes is the source of wind power
- (c)Wind hitting at the blades of a windmill causes them to rotate The rotation thus achieved can be utilised further
- (d)One possible method of utilising the energy of rotational motion of the blades of a windmill is to run the turbine of an electric generator
Show answer
(b) The potential energy content of wind blowing at high altitudes is the source of wind power
Q15Multiple choice
Choose the incorrect statement
- (a)We are encouraged to plant more trees so as to ensure clean environment and also provide bio-mass fuel
- (b)Gobar-gas is produced when crops, vegetable wastes etc., decompose in the absence of oxygen
- (c)The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash
- (d)Bio-mass is a renewable source of energy 5JQTV#PUYGT3WGUVKQPU
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(c) The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash
Q16Short answer
Why is there a need to harness non-conventional sources of energy? Give two main reasons.
Show answer
Hint— (i) Our demand for energy is increasing to improve quality of life and growth of population. (ii) Fossil fuels are limited.
Q17Short answer
Write two different ways of harnessing energy from ocean.
Show answer
Hint— Tidal, Wave, OTEC etc.
Q18Short answer
What steps would you suggest to minimise environmental pollution caused by burning of fossil fuels? 104 E XEMPLAR P ROBLEMS – SCIENCE
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(i) Use of smokeless appliances. (ii) Afforestation
Q19Short answer
What is the role of a plane mirror and a glass sheet in a solar cooker?
Show answer
Hint— Plane mirror acts as a reflector, Glass sheet results in green house effect.
Q20Short answer
Mention three advantages of a solar cell?
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Hint— (i) Solar cells have no moving parts (ii) Requires little maintenance (iii) They can be set up in remote areas
Q21Short answer
What is biomass? What can be done to obtain bio-energy using biomass?
Show answer
Hint— Biomass: Plant and animal wastes. Explain the working of a biogas plant with a labelled diagram.
Q22Short answer
What are the limitations in obtaining energy from wind? .QPI#PUYGT3WGUVKQPU
Show answer
Because of it being erratic, energy cannot be harnessed continuously. Large areas are required for wind farms. .QPI#PUYGT3WGUVKQPU
Q23Short answer
Which is the process used to harness nuclear energy these days? Explain it briefly.
Show answer
Hint— Nuclear Fission. Explanation must include all the steps starting from splitting of uranium nuclei to disposal of nuclear waste.
Q24Short answer
How can solar energy be harnessed? Mention any two limitations in using solar energy. How are these limitations overcome?
Show answer
Hint— Your answer must include: working of a solar device using reflectors/solar cell. Limitations: Available during day time/sunny days. Requires huge installations and costly. To overcome limitation: Use of solar cell.
Q25Short answer
Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one non- conventional source of energy.
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Hint— Conventional: Fossil fuels, water, wind, Biomass etc. Non Conventional: Nuclear, Solar, Energy from ocean, Geothermal etc. Explain the use of one of Non conventional source of energy.
Q26Short answer
Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?
Show answer
Hint— (i) Fossil fuels are depleting, Population is increasing, Quality of life is to be improved etc. (ii) Tidal/wave/OTEC
Q27Short answer
What are the environmental consequences of using fossil fuels? Suggest the steps to minimise the pollution caused by various sources of energy including non-conventional sources of energy.
Show answer
Hint— Air pollution, Green house effect, Environment consequences: Acid rain, global warming etc. Steps: Use of smokeless appliances, Refined technology, Judicious use of energy etc.
Q28Short answer
Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.
Show answer
Hint— Sun is the ultimate source of energy. Justify by explaining the direct or indirect dependence of different sources of energy on Sun.
Q29Short answer
What is biomass? Explain the principle and working of a biogas plant using a labelled schematic diagram. SOURCES OF ENERGY 105
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Hint— Biomass: Plant and animal wastes. Give description of biogas plant with the help of a labelled diagram. 172 E XEMPLAR P ROBLEMS – SCIENCE %*#26'4 ANSWERS /WNVKRNG%JQKEG3WGUVKQPU