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CBSE Questions for Class 10 Physics Sources Of Energy Quiz 7 - MCQExams.com
CBSE
Class 10 Physics
Sources Of Energy
Quiz 7
What is not required in the formation of biogas in a biogas plant?
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Water
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Oxygen
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Cow-dung
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Anaerobic bacteria
Explanation
Biogas production is a type of anaerobic fermentation. Anaerobic means without oxygen.
A certain form of energy does not cause any pollution and is easily converted into electricity. It is not obtained directly or indirectly from the Sun. It is technically very difficult and expensive to obtain this form of energy and it is not available everywhere. What is this form of energy called?
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Wind energy
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Nuclear energy
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Geothermal energy
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Tidal energy
Explanation
Geothermal thermal energy is the heat energy available within the Earth. However, this energy is not equally available everywhere and is concentrated in some parts of the world such as natural geysers. The extraction of geothermal energy is a costly process.
Destruction of large ecosystems occurs during the harnessing of:
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Geothermal energy
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Tidal energy
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Wind energy
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Hydroelectric energy
Explanation
To produce hydroelectricity, high-rise dams are constructed on the river to obstruct the flow of water and thereby collect water in larger reservoirs
The dams can be constructed only in a limited number of places, preferably in hilly terrains. Large areas of agricultural land and human habitation are to be sacrificed as they get submerged. Large ecosystems are destroyed when submerged under the water in dams. The vegetation which is submerged rots under anaerobic conditions and gives rise to large amounts of methane which is also a greenhouse gas. It creates the problem of satisfactory rehabilitation of displaced people.
Which of the following converts sunlight into heat
energy?
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Solar cooker
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Solar cells
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Windmill
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None of these
The main constituent of natural gas is:
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methane
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ethane
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propane
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butane
Explanation
Naturally occurring mixture of a hydrocarbon gas with methane being the primary constituent is called natural gas. Other gases found in minute traces are hydrogen, hydrogen sulphide, nitrogen, carbon monoxide and carbon dioxide.
Which bomb works on the principle of Nuclear fusion ?
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Atom bomb
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Hydrogen bomb
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Neutron bomb
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Nuclear reactor
Explanation
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei at a very high speed and join to form a new type of atomic nucleus. Fusion reactions are high energy reactions in which two lighter atomic nuclei fuse to form a heavier nucleus. This fusion reaction is taking place in hydrogen bomb.
The resource that can be used again and again after due processing are called.
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Abiotic resources
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Natural resources
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Cyclical resources
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Human-made resources
What is the main constituent of biogas?
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Cow-dung
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Methane
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Oxygen
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Helium
Explanation
Biogas is an excellent fuel as it contains up to $$75\ \%$$ methane. It
burns without smoke, leaves no residue like ash in wood, charcoal, and
coal burning. Its heating capacity is high. Bio-gas is also used for lighting
Fuels that provide most of the energy needs of the world is:
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Petroleum and coal
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Petroleum and wood
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Coal and wood
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Wood and petroleum
Explanation
As per the given diagram, most of the energy consumed around the world comes from coal and petroleum followed by natural gas and renewable resources.
The flowchart represents the energy transformation in a thermal power plant.
Identify A and B.
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A: Mechanical Energy
B: Thermal Energy
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A: Thermal Energy
B: Mechanical Energy
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A: Thermal Energy
B: Chemical Energy
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A: Chemical Energy
B: Thermal Energy
Explanation
In thermal power plants, heat energy from steam is collected used to run a turbine and is converted to mechanical energy. This mechanical energy is then converted to electrical energy.
Which of the following is an incorrect statement ?
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To overcome the energy crisis the use of solar cooker must be increased
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To overcome the energy crisis more amount of non-renewable sources of energy must be used
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The re-usage of waste material as a source of energy can be done to overcome the energy crisis
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To overcome the energy crisis water has to be saved
Explanation
Non-renewable sources of energy mean they cannot be produced or replaced by natural means at a pace to keep up with the consumption rate.
We should not exploit
non-renewable sources of energy like petrol, coal, natural gas
as they will get depleted someday. So we should use them wisely and switch to renewable sources of energy like solar energy, bio-mass, etc.
So option B is incorrect.
A good fuel should :
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be safe to store and transport
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be able to provide desired quantity of energy at a steady rate over a long period of time
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have low content of non-combustibles and no combustion products that are poisonous or environmental pollutants
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all the above
Explanation
A good source of energy would be one
which would do a large amount of work (supply energy) per unit volume or mass over a long period of time,
be easily accessible,
be easy to store and transport, and
have low content of non-combustibles and no combustion products that are poisonous or environmental pollutants
perhaps most importantly, be economical.
Photovoltaic cells use _______ to
produce electricity.
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water stored by a dam
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heat energy of coal or petroleum
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wind energy
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solar energy
An atom bomb works on :
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Electrical energy
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Heat energy
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Mechanical energy
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Atomic energy
Explanation
Atomic energy
Atomic energy is the energy that is created by splitting apart the nuclei of atoms. The atomic energy is released during the process of nuclear fission.
The basic principle of atom bomb is uncontrolled nuclear fission.
Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei with release of lot of energy.
The main constituent of bio-gas is
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Carbon monoxide
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Hydrogen
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Methane
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Carbon dioxide
The energy of water is called.
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mechanical energy
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hydroenergy
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solar energy
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none of these
Explanation
Energy available in water is commonly termed as Hydro energy.
Option B
When compared to other kinds of energy-providing fuels like petrol, wood and nuclear reactors, hydro-electricity is better. Because it
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Causes minimum pollution
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Is renewable
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Is safe
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All of these
Explanation
Energy produced by combusting wood, petrol or through via nuclear reactors causes serious pollution which is harmful for the ecology.
Whereas, hydroelectricity causes much less pollution. It is also a renewable source of energy, as the process of generating electricity relies on water cycle. It is is a safe option to produce energy.
Hence, option D is correct.
A cycle rickshaw works on electricity.
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True
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False
Categorized them as conventional and un non-conventional source of energy Petrol, wind energy, coal, diesel, solar energy, tidal energy, hydroelectricity
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Conventional: Wind energy, solar energy, tidal energy
Non-conventional: Petrol, diesel, coal, hydroeletricity
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Conventional: Wind energy, solar energy, tidal energy, hydroelectricity
Non-
conventional: Petrol, diesel, coal
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Conventional: Petrol, diesel, coal, hydroelectricity
Non-
conventional: Wind energy, solar energy, tidal energy
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Conventional: Petrol, diesel, coal
Non-
conventional: Wind energy, solar energy, tidal energy, hydroelectricity
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None of these
Explanation
The energy which are non-renewable is knows as conventional source of energy. (e.g. coal, petrol diesel)
The energy which are renewable is known as non-conventional source of energy. (e.g. wind energy, solar energy, tidal energy, hydro electricity)
In a windmill:
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the translational motion of the windmill is used to turn the turbine of the electric generator.
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the rotatory motion of the windmill is used to turn the turbine of the electric generator.
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the upward motion of wind is the primary source of energy.
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slow winds are more efficient for energy production.
Explanation
Wind turbines operate on a simple principle. The energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which spins a generator to create electricity.
Wave energy harness :
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Winds produced by huge waves.
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Waves formed by tides.
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Potential energy of normal waves.
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Kinetic energy possessed by huge waves.
Explanation
Similarly, the kinetic energy possessed by huge waves near the sea- shore can be trapped in a similar manner to generate electricity. The waves are generated by strong winds blowing across the sea. Wave energy would be a viable proposition only where waves are very strong.
Increasing the surface area of a solar cell
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increases the current and the power output.
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increases the voltage and the power output.
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decreases the current output but increases the power output.
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has no effect.
Explanation
Output of solar cell occurs at a constant voltage. Using a group of solar cells in the solar panel increases the amount of current produced. Also, as area is increased more solar energy is captured and more electrical energy is produced.
Which of the following are disadvantages of hydro power plant?
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Dams can be constructed only in a limited number of places.
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Large areas of agricultural land and human habitation are sacrificed
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Methane is released contributing to green house effect
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All of above
Explanation
In hydro electric plants:
1. Dams are constructed in hilly areas, hence only a limited number of places.
2.
Large areas of agricultural land and human habitation are sacrificed as they get submerged.
3.
The vegetation which is submerged rots under anaerobic conditions and
methane is released contributing to green house effect.
Ocean thermal energy is a useful source of energy when the temperature difference between surface and depth of 2km is:
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Less than $$10^\circ C$$
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More than $$10^\circ C$$
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Less than $$20^\circ C$$
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More than $$20^\circ C$$
Explanation
Ocean thermal energy conversion plants can operate if the temperature difference between the water at the surface and water at depths up to 2 km is $$20^\circ C$$ or more.
Ultimate source of hydroelectricity is the _______ .
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the potential energy of water
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the kinetic energy of water
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the electro-chemical energy of water
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solar energy
Explanation
The water in the reservoir above the inlet to the turbines has gravitational potential energy which is converted to kinetic energy and then to electrical energy as the water goes to the lower level of the outlet.
The ultimate source of that hydro electricity is gravitational potential energy due to large heights of storage as PE depend on height as
$$PE=mgh$$ where $$h$$ is height.
What is the disadvantage of building a large dam?
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Natural ecosystem in the surrounding forest areas get disturbed
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Plants and animals' life get disrupted
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People are displaced on a large scale.
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All of the above.
Explanation
Followings are some disadvantages of building of large dams:
1. Natural ecosystem is disturbed in surrounding areas
2. People and animals' life is disrupted
3. People are displaced on a large scale.
4. Aquatic ecosystem gets disturbed
Which of the following are characteristics of a good source of energy?
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It can provide an adequate amount of useful energy at a steady rate over a long period of time.
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It should be safe and convenient to use.
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It should be economical.
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All of the above.
Explanation
A good source of energy should be such that it can provide an adequate amount of useful energy at a steady rate over a long period of time. It should be safe and convenient to use, economical, and easy to store and transport.
Why are a large number of solar cells are joined in a solar panel?
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To reduce cost of production.
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To get more electricity.
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Its a tradition.
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None of the above.
Explanation
Solar panel uses multiple solar cells connected in series to increase electricity produced by the system.In series connection total electricity produced by all solar cells increases.
State whether the given statement is True or False :
Flowing water is a good source of energy.
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True
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False
Explanation
Flowing water is a good source of energy. It is available at many places and has great energy providing capability.Because the water cycle is an endless, constantly recharging system, flowing water is a good source of energy.
If ocean thermal energy is made feasible and cheaper, it has tremendous potential because:
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Potential energy in oceans is immense
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Ocean waves are very strong
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Most of the solar energy is incident on the ocean surface
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A lot of heat energy is trapped in the land mass below the oceans
Explanation
$$71 \%$$ of the Earth's surface is covered by oceans. Hence, most of the solar energy is absorbed by the oceans. This energy can be harnessed using OCTEC (ocean thermal energy conversion power plant). Hence, ocean thermal energy has great potential.
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