CBE Questions Chapter 14 Sources of Energy Science Class 10
Hint: Classify difference sources of energy on the basis of accessibility, cost, transportation and storage, in order to identify a 'good' source of energy.
Question.1. Which of these characteristics can help us recognize a good source of fuel?
(a) physical state
(b) availability in all regions
(c) cost effective for all countries
(d) produces large amount of energy
Question.2. Rahul can use any source of energy for cooking, but he wants to avoid production of smoke from the source. Which of these sources should he use for cooking?
(a) coal
(b) electricity
(c) petroleum
(d) wood
Ans.1. (d) produces large amount of energy
Ans.2. (b) electricity
Hint: Understand the process of extracting energy from fossil fuels, in order to develop its efficiency.
Question.3. A student wants to extract energy from a fossil fuel. Which process would help him to extract the energy from a fossil fuel?
(a) burning
(b) crystallization
(c) condensation
(d) distillation
Question.4. A student studies that efficiency of a fuel can be increased using new technologies. How does increased efficiency benefits humans and environment?
(a) production of fuel will increase
(b) cost of fuel production will decrease
(c) amount of fuel in reservoirs will increase
(d) pollution and consumption will decrease
Ans.3. (a) burning
Ans.4. (d) pollution and consumption will decrease
Hint: Compare the process of energy consumption through thermal and hydro power plants, in order to classify them as 'good' or 'bad' sources of energy.
Question.5. A student studies that generation of electricity in a thermal power plant is done by burning of a large amount of fossil fuels. He also studies that thermal power plant is considered as bad source of energy. Why?
(a) as it uses very less amount of fossil fuels
(b) as burning of fossil fuel releases harmful gases
(c) as electricity is harmful and pollutes the environment
(d) as thermal power plants produce less amount of electricity
Question.6. A student studies hydro power plants can produce electricity by using the kinetic energy of the stored water in dams. Thus, water can be refilled again and again to produce electricity. As it doesn’t require burning of fossil fuel, oxides of carbon, nitrogen and sulphur gases are not released into the atmosphere. Should hydro power plant consider as a ‘good’ or ‘bad’ source of energy?
(a) good, as it uses releases oxides of carbon
(b) bad, as it uses water as a source of energy
(c) good, as it does not pollute the atmosphere
(d) bad, as no ashes is produces while burning of fossil fuels
Ans.5. (b) as burning of fossil fuel releases harmful gases
Ans.6. (c) good, as it does not pollute the atmosphere
Hint: Explain the formation of bio-mass, in order to classify it as 'good' or 'bad' sources of energy.
Question.7. A student studies that bio-gas is produced from the residue left after harvesting of crops, produces methane, which burns without releasing smoke and leaves no ashes. He also studied that it is considered as ‘good’ source of energy. Why is it considered as a ‘good’ source of energy?
(a) as it produces ashes
(b) as it produces methane
(c) as it burns without releasing smoke
(d) as it decomposes in the absence of oxygen
Question.8. A student studies that bio-gas contains a large amount of methane which can be used as a fuel for various uses. It burns without releasing smoke and leaving no residue like ash in other fossil fuel. Should bio-mass be consider as a ‘good’ or ‘bad’ source of energy?
(a) bad, as it does not release smoke
(b) good, as it produces methane gas
(c) bad, as it burns without releasing smoke
(d) good, as it does not cause any harm to the environment
Ans.7. (c) as it burns without releasing smoke
Ans.8. (d) good, as it does not cause any harm to the environment
Hint: Outline the process of extracting energy from wind, in order to assess it as a conventional source of energy.
Question.9. Which of these processes explains the extraction of energy from wind to generate energy for a water-lifting pump?
(a) conversion of mechanical energy of wind into kinetic energy
(b) conversion of kinetic energy of wind into mechanical energy
(c) conversion of mechanical energy of wind into potential energy
(d) conversion of potential energy of wind into mechanical energy
Question.10. A student studies that the movement of the wind is caused due to uneven heating of the Earth surface. This helps in rotating a windmill which can be used to lift water from a well. He also studied that wind energy is considered as a conventional source of energy. Why is it considered as conventional source of energy?
(a) as it can rotate a windmill
(b) as it can help in lifting water
(c) as it is readily available and used for a long time
(d) as it produced due to uneven heating of the Earth
Ans.9. (b) conversion of kinetic energy of wind into mechanical energy
Ans.10. (c) as it is readily available and used for a long time
Hint: Describe the process of extracting energy from sun's rays, in order to assess it as a nonconventional source of energy.
Question.11. Which of these processes explains the extraction of Sun’s energy to generate energy to light a bulb?
(a) conversion of electric energy into solar energy
(b) conversion of solar energy into electric energy
(c) conversion of solar energy into kinetic energy
(d) conversion of kinetic energy into solar energy
Question.12. A student studies that solar energy can be used to generate electricity by using solar cells. It has been possible to use this energy due to technological advancement. It can generate electricity when exposed to the Sun. He also studied that solar energy is considered as a conventional source of energy. Why is it considered as a conventional source of energy?
(a) as use of this energy have been possible due to advancement of technology
(b) as it generates electricity which is a clean source of energy
(c) as it has been used form ancient times
(d) as it uses Sun as a source of energy
Ans.11. (b) conversion of solar energy into electric energy
Ans.12. (a) as use of this energy have been possible due to advancement of technology
Hint: Infer the process of extracting energy from the sea (tidal, wave, ocean thermal), in order to assess it as a non-conventional source of energy.
Question.13. Which process explains the energy extraction from a sea wave?
(a) using kinetic energy of the waves to produce electricity
(b) using thermal energy of the waves to produce electricity
(c) using chemical energy of the waves to generate electricity
(d) using electrical energy of the waves to generate electricity
Question.14. Ravi studies that the due to gravitational pull, level of water in the sea rises and falls. With the advancement of technology generation of electricity has been made possible. This type of energy is known as tidal energy. Should tidal energy consider as conventional or nonconventional source of energy?
(a) conventional, as it is uses water as source of energy
(b) non-conventional, as gravitational energy is converted to electrical energy
(c) conventional, as the resulted product is electricity which can be used as fuel
(d) non-conventional, as extraction of this energy is possible with advance in technology
Ans.13. (a) using kinetic energy of the waves to produce electricity
Ans.14. (d) non-conventional, as extraction of this energy is possible with advance in technology
Hint: Elaborate the process of extracting geothermal and nuclear energy, in order to assess it as a non-conventional source of energy.
Question.15. Which of these processes explains the working of a geothermal power plant?
(a) use of potential energy to produce electricity
(b) use of thermal energy to produce electricity
(c) use of kinetic energy to produce electricity
(d) use of tidal energy to produce electricity
Question.16. A student studies that energy can be produced by splitting a heavy atom when bombarded with low energy neutron. This can be done in nuclear reactor which is designed for generation of power. This form of energy known as nuclear energy. He also studies that this nuclear energy is considered as non-conventional source of energy. Why is it considered as nonconventional source of energy?
(a) as it splits a heavy atom to produce energy
(b) as a low energy neutron is involved in the process as bombardment results in the
(c) production of energy
(d) as energy can be extracted only through a nuclear reactor
Ans.15. (b) use of thermal energy to produce electricity
Ans.16. (d) as energy can be extracted only through a nuclear reactor