Here you will find NCERT Class 10 Science Chapter 14 Solutions contains all the main and important topics which have a complete and detailed description. NCERT Class 10 Science Chapter 14 Solutions will help the students of class 10 to understand concepts. After reading this article you can solve Class 10 Science Chapter 14 Extra Questions.
 |
| NCERT Class 10 Science Chapter 14 Solutions |
NCERT Class 10 Science Chapter 14 Solutions
NCERT Class 10 Science Chapter 14 Solutions covers the complete syllabus and lets you secure the best results in CBSE and other board exams. NCERT Class 10 Science Chapter 14 Solutions will help you to solve homework and home assignments in an easy way.
NCERT Class 10 Science Chapter 14 Solutions
You must
know the topics and subtopics of Chapter 14 Sources of Energy of NCERT Science
for Class 10 before you go through the Solutions of Chapter14 Sources of Energy
of NCERT Science for Class 10.
1. What is A Good
Source of Energy?
2. Conventional
Sources of Energy
3. Alternative of Non-
Conventional Sources of Energy
4. Environmental Consequences
5. How Long Will An
Energy Sources Last Us?
Chapter 14 - Sources of Energy
TEXTBOOK QUESTIONS:
Questions
(Page 243)
Q.1 What is a good
source of energy?
Ans. A good source of energy has the following characteristics
–
i.It must be
convenient to use.
ii. It should be
capable of producing an adequate amount of energy.
iii. It must be
easy to transport and store.
iv. It should
not produce too much smoke and ash during combustion.
v.It should be
cheap and easily available.
Q.2 What is a good
fuel?
Ans. A good
fuel must have the following properties-
i.It should be
easily available.
ii. It must not
produce poisonous material on burring.
iii. It can be
easily transported and stored.
iv. It must
produce a high amount of energy when burnt.
v.Above all, it
should be cheap.
Q.3 If you could
use any source of energy for heating food, which one would you use and why?
Ans. We would use cooking gas for heating food if
it is available because:
i.It is a clean
fuel.
ii. It provides an adequate amount of energy per unit mass or volume.
iii. It is easily
accessible.
iv. It is safe
in transportation and storage.
Questions
(Page 248)
Q.1What are the disadvantages of fossil fuel?
Ans.Disadvantages of fossil fuels:
(i)Fossil fuels
are non-renewable sources of energy.
(ii) Combustion of fossil fuels causes air pollution.
(iii). On burning fossil fuel produces smoke and other poisonous pollutants like sulphur dioxide, nitrogen oxide, etc.
(iv). Sulphur dioxide and nitrogen oxide are acidic in nature and cause acid rain that affects water and soil.
(v). The burning of fossil fuels produces a large amount of carbon dioxide that causes an increased greenhouse effect.
Q.2 Why are we
looking for alternate sources of energy?
Ans. We are looking for alternate sources of
energy because of the following reasons-
i.Demand for
energy is increasing day by day because of the development of technology.
ii. The fossil
fuels and other fuels on the earth
are limited.
iii. fossil
fuels and nuclear fuels produce harmful radioactive waste which is a threat to
our environment.
Q.3 How has the
traditional use of wind and water energy been modified for our convenience?
Ans. Electricity is a convenient form of energy.
Traditional use of wind and water energy has been modified to generate
electricity. Flowing water is collected in reservoirs constructing high dams. It
is carried through pipes to rotate turbine which is connected with a dynamo to
generate electricity and kinetic energy of wind is used to harness electricity
through the windmill.
Questions
(Page 253)
Q.1 What kind of
mirror-concave, convex or plane, would be best suited for use in a solar
cooker? Why?
Ans. A plane mirror would be best suited for use
in a solar cooker because it increases the area over which solar energy is
received and reflected in the glass sheets.
Q.2 What are the
limitations of the energy that can be obtained from the oceans?
Ans. Limitations of energy obtained from oceans.
From the oceans, we get tidal energy, wave energy, and ocean thermal energy. The
potential of all these forms of energy is quite large but efficient commercial
exploitation is difficult. so, these forms of energy are not the reliable type of
forms of energy.
Following
types of energy can be obtained from oceans-
1. Tidal energy
2. Wave energy
3. Ocean
thermal energy
Limitations
of energy obtained from oceans-
i.Commercial
exploitation of this energy is difficult.
ii. The rise and
fall of seawater are not enough to generate electricity.
iii.Sea waves
have kinetic energy and there are limited sites in the world where waves strike
the shore with much energy through which electricity can be generated on large
scale.
iv. Ocean
thermal energy can be converted into electricity when there is a temperature
difference between surface water and deep water is between 20
Q.3 What is
geothermal energy?
Ans. The deeper regions of the earth's crust are very
hot. Energy stored as heat in such regions of the earth is called geothermal
energy and these regions are called hotspots. When underground water comes in
contact with the hot spots, steam is generated. This steam is used to generate
electricity using turbines.
Q.4 What are the advantages
of nuclear energy?
Ans. Advantages of nuclear energy:
1. Nuclear
energy is produced using a very lesser quantity of nuclear fuel as compared to
fossil fuels.
2. It produces a large amount of energy from a very small amount.
3. Nuclear
power plants cause less environmental pollution if operated carefully and
properly.
4. It does not
produce gases like carbon dioxide, sulphur dioxide, and other harmful
pollutants.
Questions
(Page 254)
Q.1 Name two energy
sources that you would consider renewable. Give reasons for your answer.
Ans. Solar energy and forests are renewable
sources of energy. The energy received from the sun in the form of heat and
light is known as solar energy which is abundant and inexhaustible. So it is
considered a renewable source of energy.
Forests are
also a renewable source of energy if we manage the biomass by replacing the tree
we cut down for use; we will be assured of a constant supply of wood from
forests.
Q.2 Give the names
of two energy sources that you would consider to be exhaustible. Give reasons
for your choice.
Ans. Fossil fuels such as coal, petroleum, and
natural gas are considered exhaustible. Fossil fuels such as coal, petroleum, and natural gas have occurred over millions of years under certain special
circumstances. Such circumstances are not prevailing now. These fuels are
limited and can be exhausted soon so fossil fuels are classified as
non-renewable or exhaustible sources of energy.
EXERCISES:
Q.1 A solar water
heater cannot be used to get hot water on:
(a) a sunny day
(b) a cloudy day
(c) a hot day
(d) a windy day
Ans. (b) a
cloudy day
Q.2Which of the
following is not an example of a bio-mass energy source
(a) wood
(b) gobar gas
(c) nuclear energy
(d) coal
Ans. (c) nuclear
energy
Q.3Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy?
(a) geothermal energy
(b) wind energy
(c) nuclear energy
(d) bio-mass
Ans. (b) nuclear
energy
Q.4 Compare and
contrast fossil fuels and the sun as sources of energy.
Ans. Sun is the ultimate source of energy while fossil fuels are formed as a result of trapping solar energy in the form of biomass.
Fossil fuels are non-renewable sources of energy while
Solar energy is a renewable source of energy.
Solar energy
is a clean and non-polluting source of energy while fossil fuels cause air
pollution.
Q.5 Compare and
contrast bio-mass and hydroelectricity as sources of energy.
Ans. Bio-mass and hydroelectricity
The matter
contained in the bodies of plants and animals is called biomass and energy is
produced by the burning biomass. The electrical energy produced using the
energy of flowing water is called hydroelectricity.
Use of
bio-mass causes smoke and ash and it is a major cause of pollution. Hydroelectricity is a clean and non-polluting source of energy.
Q.6 What are the limitations of extracting energy from it?
(a) The wind
(b) waves
(c) tides
Ans.(a) Limitations
of wind energy:-
The wind is
not available all the time at all places.
2. Wind
farms can be established at those places where the wind blows.
3. The wind
speed should be higher than 15 km/h to maintain the required speed of the
turbine.
4.
Establishment of wind farms needs a large area of land.
(b) Limitations
of wind extracting energy from waves:-
Wave energy
can be harnessed at some specific sites.
Wave energy
is a viable proposition where waves are very strong.
The present
technology is not so advanced to generate cheap power from wave energy.
(c)Limitations of extracting energy from tides:-
The rise and
fall of water during tides are not high enough to produce electricity on a large
scale.
There are a
few sites that are suitable for the construction of dams.
Q.7 On what basis
would you classify energy sources as
(a) Renewable
and non-renewable
(b) Exhaustible
and inexhaustible
Are
the options are given in (a) and (b) the same?
Ans. (a) The resources which are renewed or
replenished by nature after some time are called renewable resources such as
groundwater, forests, wood, and solar energy
The
resources which are not renewed or replenished by nature in a short period are
called non-renewable resources such as fossil fuels.
(b)
Exhaustible sources of energy are the sources of energy that are present in
limited quantity and will exhaust in the future but inexhaustible sources are
present in unlimited quantity and can be replenished again.
No,
renewable sources are inexhaustible, and non-renewable sources of energy are
exhaustible.
Q.8What are the
qualities of an ideal source of energy?
Ans.
1. It must be
easy to store and transport.
2. It must
produce an adequate amount of energy.
3. It must be
easily available and cheap.
4. It must be
convenient to use.
Q.9 What are the
advantages and disadvantages of using a solar cooker? Are there places where
solar cookers would have limited utility?
Ans. Advantages of solar energy devices: -
1.No fuel or
electricity is required to use them.
2. They produce
no pollution, that’s why they are environment friendly.
3. The
nutrients are not destroyed in a solar cooker.
The disadvantage of using a solar cooker:
1. On a cloudy
day and at the night, working on a solar cooker is not possible.
2. It cannot be
used in making chapattis.
3. It is also
not good for frying purposes.
4. The
direction of reflectors has to be adjusted continuously according to the
position of the sun.
5. In places
where the sky remains full of clouds, solar cookers have limited utility.
Q.10 What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?
Ans.
1. Burning of
fossil fuels produces air pollution.
2. Construction
of dams over rivers destroys the nearby ecosystem.
3. Increasing
demand for energy compels to exploit more energy sources and it will disturb
the environment.
4. No fuel
or source of energy is pollution-free. So the use of any of the energy sources
causes damage to the environment.
In what way is a thermal power plant different from hydropower plant NCERT Solutions?
Ans. There are the following differences between a thermal power plant and a hydropower plant-
1. Thermal power plant generates electricity from heat produced by burning fossil fuels like coal and petroleum whereas a hydropower plant generates electricity from the kinetic energy of flowing water.
2. There is a lot of pollution produced in a thermal power plant but there is no pollution produced in a hydropower plant.
3. In a hydropower plant water is used to produce electricity which is a renewable energy source but in a thermal power plant fossil fuels which are exhaustible energy sources, are used.
4. Hydropower plant is cost-effective in comparison to the thermal power plant.
5. Electricity can be generated for a longer time in a hydropower plant but in a thermal power plant, it is not possible.
These NCERT Class 10 Science Chapter 14 Solutions and study material will help you good marks for your CBSE Board and
Other state board exams.
Related topics You may also like
1. Extra Questions of Chapter 14
2. Extra Questions of Chapter 15
Frequently Asked Questions
1. What is the best renewable energy source?
The sun is the best renewable source of energy. The
other sources like – geothermal, ocean energy, wind energy are also good
sources of energy but they also depend on the sun.
2. How should renewable energy be defined?
Energy can be renewable and non-renewable. renewable
energy is energy that can be used again and again and is unlimited and inexhaustible.
3. What form of renewable energy is the most efficient?
There is much renewable energy on the earth have,
but the renewable energy which is the most efficient is solar energy because it
is plenty.
No comments:
Post a Comment