KSEEB SSLC Class 10 Science Solutions Chapter Chapter 14 Sources of Energy

KSEEB SSLC Class 10 Science Solutions Chapter 14 Sources of Energy are part of KSEEB SSLC Class 10 Science Solutions. Here we have given Karnataka SSLC Class 10 Science Solutions Chapter 14 Sources of Energy.

Karnataka SSLC Class 10 Science Solutions Chapter 14 Sources of Energy

KSEEB SSLC Class 10 Science Chapter 14 Intext Questions

Text Book Part I Page No. 110

Question 1.
What is a good source of energy?
Answer:
A good source of energy fulfills the following criteria:

  1. It does a huge amount of work per unit mass.
  2. It is easily accessible and economical.
  3. It is easy to store.
  4. It produces less amount of smoke.

Question 2.
What is a good fuel?
Answer:
A good fuel produces a huge amount of heat on burning, does not produce a lot of smoke, and is easily available.

Question 3.
If you could use any source of energy for heating your food which one would you use and why?
Answer:
I would prefer to use any renewable energy as solar energy because it will never be insufficient and will not harm atmosphere by generating pollution.

Text Book Part I Page No. 115

Question 1.
What are the disadvantages of fossil fuels?
Answer:

  • The fossil fuels are non renewable source of energy. If we were to consuming these sources as such an  alarming rate, we would soon run out of energy.
  • Air pollution is. caused bybuTnmg fossil fuels.
  • The oxides of carbon, nitrogen and ‘ sulphur drat are released on burning fossil fuels am acidic oxides. This lead to acid rain which affects our water and soil resources.
  • Carbon dioxide produced by burning these fuels produces green house effect

Question 2.
Why are we looking at alternate sources of energy?
Answer:
Alternative sources of energy of present time i.e., fossil fuel is very much required because:

  1. It is non renewable, so if not now, then alternatively a day will come when we have to look for its alternative.
  2. These sources of energy are limited and can not replenish on their own.

Question 3.
How has the traditional use of wind and water energy been modified for our convenience?
Answer:
Transformation of wind and water energy use:

  1. Windmills were used to harness wind energy to do mechanical work such as lifting/drawing water from well.
  2. Waterfalls were used as a source of potential energy which was converted to electricity with the help of turbines.

Text Book Part I Page No. 120

Question 1.
What kind of mirror – concave, convex or plain – would be best suited for use in a solar cooker? Why?
Answer:
A concave mirror would be best suited for use in a solar cooker. When a concave mirror reflector is. attached to a solar; cooker, it converges a large amount of sun’s be radiations at its focus due to which a high temperature is produced at die focus area.

Question 2.
What are the limitations of the energy that can be obtained from the oceans?
Answer:
Tidal energy wave energy and ocean thermal energy are the sources of the energy that can be obtained from the oceans. Their limitations are as follows:

  1. Tidal energy: The locations where such dams can be built are limited.
  2. Wave energy: Wave energy would be a viable proposition only where waves are very strong.
  3. Ocean thermal energy: Efficient commercial exploitation is difficult for this energy.

Question 3.
What is geothermal energy?
Answer:
Due to geological changes, molten formed in the deeper hot regions of earth’s crust are pushed upward and trapped in certain regions called ‘hot spots’. This is called Geothermal energy.

Question 4.
What are the advantages of nuclear energy?
Answer:

  • It produces huge amount of energy form very small amount of a nuclear’ fuel.
  • It does not produce gases like carbon 2. dioxide which contribute to green house effect or sulphur dioxide which causes acid rain.
  • Once the nuclear fuel is loaded into the reaction, the nuclear power plant can go on producing electricity for 3. two to three years at a stretch. Hence, there is no need for putting in the nuclear fuel again and again.

Text Book Part I Page No. 120

Question 1.
Can any source of energy be pollution-free? Why or why not?
Answer:
No source of energy be pollution free. Because fossil fuels cause air pollution. Nuclear energy causes more hazards for environment. In some cases, the actual operation of a device like the solar cell may be pollution-free, but the assembly of the device would have caused some environmental damage.

Question 2.
Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?
Answer:
Hydrogen gas burns and produce steam. Because of this environment is not polluted. Hence it is used in rockets as fuel. But this gas is explosive. It is not a cleaner fuel than CNG. Because CNG is cleaner than the other sources of energy.

Text Book Part I Page No. 121

Question 1.
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
Answer:
Solar energy and wind energy are the two renewable sources of energy.
i) Solar energy: The sun has been radiating an enormous amount of energy at the present rate for nearly 5 billion years and will continue radiating at that rate for about 5 billion year more. A large number of solar cells are, combined in an arrangement called solar cell panel that can deliver enough electricity for practical use.

The principal advantages associated with solar cells are that they have no moving parts, require little maintenance and work quite ossificatory without the use of any focussing device. Another advantage is that they can-be set up in remote and in accessible hamlets or very sparsely inhabited areas in which laying of a power transmission line may be expensive and not commercially viable.

ii) Wind energy: Unequal heating of the landmass and water bodies by solar radiation generates air movement and causes winds to blow. This kinetic energy of the wind can be used to work. Wind energy is an environment-friendly and efficient source of renewable energy. It requires no recurring expenses for the production of electricity.

Question 2.
Give the names of two energy sources that you would consider to be exhaustible.Give reasons for your choices.
Answer:
Energy sources like coal and petroleum are exhaustible. These take millions of years to form and once all used up will not be available for present generation.

KSEEB SSLC Class 10 Science Chapter 14 Textbook Exercises

Question 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
Answer:
(b) a cloudy day.

Question 2.
Which of the following is not an example of a bio-mass energy source?
(a) wood
(b) gobar-gas
(c) nuclear energy
(d) coal
Answer:
(c) nuclear energy.

Question 3.
Most 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.
Answer:
(b) wind energy.

Question 4.
Compare and contrast fossil fuels and the Sun as direct sources of energy.
Answer:
Air pollution is caused by burning of coal or petroleum products. The oxides of carbon, nitrogen and sulphur that are released on burning fossil fuels are acidic oxides. These lead to acid rain which affects our water and soil resources. In addition to the problem of air pollution, recall the green house effect of gases like carbon dioxide.

Sun is the main source Of energy, we get all sources of energy by solar energy. Hence this a renewable source of energy which we get in plenty and free of cost.

Question 5.
Compare and contrast bio-mass and hydro electricity as sources of energy.
Answer:
Bio-mass: Cow-dung, various plant materials like the residue after . harvesting the crops, vegetable waste and sewage are decomposed in the absence of oxygen to give biogas. Since the starting material is mainly cow-dung, it is popularly known as ‘gober gas’. Biogas is produced in biogas plant.

Bio gas 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. The slurry left behind is removed periodically and used as excellent manure. This is one of the renewable source of energy.

Hydro Electricity: In order to produce hydel electricity, high rise dams are constructed on the river to obstruct the flow of water and thereby collect water level rises and in this process the kinetic energy of flowing water, gets transformed into potential energy. The water from the high level in the dam is carried through pipes to the turbine, at the bottom of the dam. Since the water in the reservoir would be refilled each time it rains. We would not have to worry about hydro electricity sources getting used up the way fossil fuels would get finished one day.

Question 6.
What are the limitations of extracting energy from:
(a) The wind?
(b) Waves?
(c) Tides?
Answer:
Limitation are of as follows:

From: (a) Wind energy:

  1. Periodic, not continuous.
  2. Small output.
  3. Large area required

From: (b) Wave energy:

  1. Periodic not continuous
  2. Small availability
  3. Large area required

From: (c) Tide energy:

  1. Again periodic.
  2. Small availability
  3. Lower output.

Question 7.
On what basis would you classify energy sources as:

  1. Renewable and non-renewable?
  2. Exhaustible and inexhaustible?

Are the options given in (i) and (ii) the same?
Answer:
Energy sources would be classified as (i) renewable and (ii) non-renewable.
Renewable sources of energy are inexhaustible.
Non-renewable sources of energy are inexhaustible.
Therefore, options (i) and (ii) are the same.

Question 8.
What are the qualities of an ideal source of energy?
Answer:
Qualities of an ideal source of energy:

  1. It must produce large amount of energy per unit volume or mass.
  2. It must not leave more residue and harmful gases on burning.
  3. It must be convenient and economical in use.
  4. It must be easy to handle and portable.

Question 9.
What are the advantages and disadvantages of using solar cooker? Are there places where solar cookers would have limited utility?
Answer:
Solar cookers have limited utility at places which remain cloudy or have larger winters eg, hilly areas. Advantages of using a solar cooker

  • It cooks food without causing any kind of pollution.
  • It is economical to use solar cooker because nothing is to be paid for using solar energy.
  • It is easy to handle solar cooker and there is no chance of any kind of accident.
  • It nutrients in the food do not get destroyed.

Disadvantages of using a solar cooker.

  • Solar cooker cannot be used at night and during cloudy weather.
  • It takes more time to cook food.
  • The direction of solar cooker is to be changed

Question 10.
What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?
Answer:

  1. Burning of fossil fuels produces acid rain which damages plants, soil and aquatic life.
  2. Felling of trees in the forests to obtain firewood is causing soil erosion and destroying wild life.
  3. Nuclear power plants increases harmful radio active rays which affect the environment.
  4. Construction of dams on rivers is destroying large ecosystems which get submerged under water in dams.

Steps to reduce energy consumption:

  1. Reduce wastage of electricity by switching off unnecessary electrical appliances.
  2. Using fuel saving devices such as pressure cookers etc. for cooking. Solar cookers should be used wherever possible.
  3. Reduce the use of petrol by walking or cycling for short distances.
  4. Send discarded items of paper, plastic, glass and metal for recycling to respective industries.
  5. Use of bio-gas as a fuel should be encouraged in rural areas.

KSEEB SSLC Class 10 Science Chapter 14 Additional Questions and Answers

Question 1.
Draw a neat diagram showing a model to demonstrate the process of thermoelectric production and label the parts.
Answer
KSEEB SSLC Class 10 Science Solutions Chapter Chapter 14 Sources of Energy Ad Q 1

Question 2.
Draw a neat diagram of a solar cooker and label the parts.
Answer:
KSEEB SSLC Class 10 Science Solutions Chapter Chapter 14 Sources of Energy Ad Q 2

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