Class 5 Science Chapter 9 Fuels Solutions

CHAPTER - 9

Fuels

EXERCISE

(Question/Answer)

Highlights

(i) Fill in the blanks.

(ii) Write True or False for the following statements.

(iii) Tick the correct option

(iv) Answer the following questions in brief.

(v) Answer the following questions.

Fill in the blanks

( Exercise )

1. ___________ acts as fuel for our body.

2. Cowdung cake has been often used as a ___________ fuel.

3. Aeroplanes use highly refined ___________ based fuel.

4. ___________ is a better green fuel.

5. Petrol and _ are fossil fuels used for transportation.
6. Solar energy is a _ source of energy.

Answer

(1) Food

(2) domestic

(3) kerosene

(4) CNG

(5) diesel

(6) renewable.

Write True or False for the following statements.

( Exercise )

1. LPG is used as a domestic fuel.

2. Some train engines run on diesel.

3. Powerhouses burn CNG to generate electricity.
4. Coal is a renewable source of energy.
5. We should use public transport to help reduce environmental pollution.

Answers

(1) True

(2) True

(3) False

(4) False

(5) True.

Tick the correct option.

( Exercise )

1. Out of the following, the fuel, that is best for reducing environmental pollution, is-

2. A good fuel is one that-

3. A fuel, that is not obtained by refining petroleum, is-
4. Out of the following, the energy source, that is a renewable energy source, is-
5. Coal, a common fossil fuel, is formed-

Answer

(i) compressed natural gas

(ii) does not produce smoke or leave ash.

(iii) biogas

(iv) wind

(v) Answer: by decay of vegetation, under heat and high pressure, over a long period of time.

Answer the following questions in brief.

( Exercise )

1. State the main function of a fuel.

Answer: Main function of a fuel is to give energy.

2. Give one example each of solid, liquid and gaseous fuels.

Answer: one example each of solid, liquid and gaseous fuels are:

Solid fuel – coal
Liquid fuel – Petrol
Gaseous fuel – CNG

3. Why is biogas regarded as a better fuel than cowdung cakes?

Answer: Biogas regarded as a better fuel than cow dung cakes as it does not produce smoke on burning and does not leave any ash after burning.

4. Why is CNG called a better green fuel?

Answer: CNG is called a better green fuel because it causes less air pollution, is more eco-friendly and causes less harm to the health of humans and animals.

…………………………………………………….

5. Name the three main fossil fuels.

Answer: Coal, Petroleum and Natural gas.

…………………………………………………….

6. State two disadvantages of fossil fuels.

Answer: Two disadvantages of fossil fuels are as follows:

Fossil fuels are major cause of environmental pollution.
Burning of fossil fuels produce gases such as carbon dioxide that causes global warming.

Answer the following questions.

( Exercise )

1. How have fossil fuels been formed?

Answer: Fossil fuels are formed by decomposition of animal and plant matter buried deep under the surface of earth at the high temperature and pressure prevailing there.

2. When is a source of energy said to be a renewable source of energy? Give two examples of such sources.

Answer: A source of energy which is freely available and can be readily replenished is called renewable source of energy.

Examples – solar energy, wind energy.

3. When is a source of energy said to be a non-renewable source of energy? Give two examples of such sources.

Answer: A source of energy which once used, cannot be readily replenished is called non-renewable source of energy.

Examples – Coal, Petroleum.

4. How is coal used by powerhouses for generating electricity?

Answer: Powerhouses often burn coal to convert water into steam. This steam energy is used to operate turbines which generate electricity.

5. Why should efforts need to be made to reduce the use of fossil fuels?

Answer: Efforts need to be made to reduce the use of fossil fuels because fossil fuels are available in limited quantity and are not likely to last for a long time. They are also a major cause of environmental pollution.

CHAPTER - 9

Fuels

EXERCISE

(Question/Answer)

Highlights

(i) Fill in the blanks.

(ii) Write True or False for the following statements.

(iii) Tick the correct option

(iv) Answer the following questions in brief.

(v) Answer the following questions.

Fill in the blanks

( Exercise )

1. ___________ acts as fuel for our body.

2. Cowdung cake has been often used as a ___________ fuel.

3. Aeroplanes use highly refined ___________ based fuel.

4. ___________ is a better green fuel.

5. Petrol and ___________ are fossil fuels used for transportation. 6. Solar energy is a ___________ source of energy.

Answer

Write True or False for the following statements.

( Exercise )

1. LPG is used as a domestic fuel.

2. Some train engines run on diesel.

3. Powerhouses burn CNG to generate electricity. 4. Coal is a renewable source of energy. 5. We should use public transport to help reduce environmental pollution.

Answers

Tick the correct option.

( Exercise )

1. Out of the following, the fuel, that is best for reducing environmental pollution, is-

2. A good fuel is one that-

3. A fuel, that is not obtained by refining petroleum, is- 4. Out of the following, the energy source, that is a renewable energy source, is- 5. Coal, a common fossil fuel, is formed-

Answer

Answer the following questions in brief.

( Exercise )

1. State the main function of a fuel.

2. Give one example each of solid, liquid and gaseous fuels.

3. Why is biogas regarded as a better fuel than cowdung cakes?

4. Why is CNG called a better green fuel?

Answer the following questions.

( Exercise )

1. How have fossil fuels been formed?

2. When is a source of energy said to be a renewable source of energy? Give two examples of such sources.

3. When is a source of energy said to be a non-renewable source of energy? Give two examples of such sources.

4. How is coal used by powerhouses for generating electricity?

5. Why should efforts need to be made to reduce the use of fossil fuels?

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5. Petrol and _ are fossil fuels used for transportation.
6. Solar energy is a _ source of energy.

3. Powerhouses burn CNG to generate electricity.
4. Coal is a renewable source of energy.
5. We should use public transport to help reduce environmental pollution.

3. A fuel, that is not obtained by refining petroleum, is-
4. Out of the following, the energy source, that is a renewable energy source, is-
5. Coal, a common fossil fuel, is formed-