case /data -based (4 Marks)

Question 14 Marks

The diagram shows the formation of fossil fuels.

7. What is the minimum time required for marine organisms to transform into fossil fuels?
A. Less than 100 million years
B. 100 - 200 million years
C. 200 - 300 million years
D. More than 300 million years
8. Name any three examples of fossil fuels.
9. How are the wastes discharged from a biogas plant reused?
A. As clay for pottery
B. As fuel for cooking
C. As food for animals
D. As manure for plants
10. Which of these is true about fossil fuels?
Circle ‘Yes’ or ‘No’ for correct response.

Is this statement true for fossil fuels?	Yes or No
Formation of fossil fuels requires heat and pressure.	Yes/No
Fossil fuels have no alternatives as energy source.	Yes/No
Fossil fuels are non-conventional source of energy.	Yes/No

Answer

7. D. More than 300 million years
8. Mentions any three examples of fossil fuels.
For example:
● Coal, petrol, diesel, LPG
9. D. As manure for plants
10. Yes
No
No

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Question 24 Marks

The picture shows how sunlight heats the water in a solar water heater.

2. When will the solar water heater work most eficiently?
A. At noon under a clear sky
B. At noon under a cloudy sky
C. In the morning under a clear sky
D. In the morning under a cloudy sky
3. ²H + ²H → X + n
What is the formula for X in the given reaction?
4. Which type of energy is derived from the sea?
A. Tidal energy
B. Wind energy
C. Nuclear energy
D. Thermal energy
5. Which source of energy emits large amounts of greenhouse gases?
A. Sun
B. Coal
C. Wind
D. Water
6. Which of these statements is true about biogas?
Circle ‘Yes’ or ‘No’ for correct response.

Is this statement true about biogas?	Yes or No
It contains poisonous chemicals.	Yes/No
It contains 75% methane.	Yes/No
It is produced in the absence of oxygen.	Yes/No

Answer

2. A. At noon under a clear sky
3. Mentions ³He as correct response
4. A. Tidal energy
5. B. Coal
6. No
Yes
Yes

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Question 34 Marks

1. Which source of energy for cooking will produce the least air pollution?
A. Petrol
B. Coal
C. LPG
D. Wood

Answer

1. C. LPG

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Question 44 Marks

According to pie-chart which of the fossil fuel is most widely used in India?

Answer

Fossil fuel is a fuel formed by the natural process of decomposition of buried dead organisms which contains an abundant amount of energy.
44% of fossil fuel is used as coal which is a combustible powder of carbon used as fuel.
23% of fossil fuel is used as biomass which is an organic matter made from biogas.
23% of fossil fuel industry used as petroleum which is a liquefied petroleum gas.
6% of fossil fuel is used as natural gas.
1% of fossil fuel as hydroelectric power.
2% of fossil fuel as other renewable resources.

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Question 54 Marks

The calorific values of five fuels A, B, C, D and E are given below:

(A)	48kJ/ g
(B)	17kJ/ g
(C)	150kJ/ g
(D)	50kJ/ g
(E)	30kJ/ g

Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene?

Answer

Cooking gas – D
Alcohol – E
Wood – B
Hydrogen – C
Kerosene – A

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Question 64 Marks

Of the major requirement of different forms of energies, write which one is the greater requirement of India and which is the least? What is the percentage of the hydro energy requirement of India?

Answer

Forms of Energy.
Chemical energy.
Electrical Energy.
Mechanical Energy.
Thermal energy.
Nuclear energy.
Pros and cons of nuclear power.
Gravitational Energy.
India requires tidal energy on a larger scale as it is covered with water on all the three parts and on the other hand it requires the nuclear energy the least as it has less reserves of nuclear raw material.
Hydro power makes up 14.01 percent, with 44, 189. 43MW of the total power generated in the country.

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Science case /data -based (4 Marks)

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