Fossil Fuels

Q. What is water gas? What is it used for?

Q. Which gases are responsible for acid rain
A)co2, h2o
B)no2, so2
C)no, co2
D)no, so2

Q.

Explain how petroleum is formed with the help of a diagram. [5 MARKS]

Q.

Which of the following are greenhouse gases?

a. CO₂
b. Water vapour
c. Oxygen
d. Methane
e. Nitrogen
f. Nitrous oxide

1. a, c, d and f

2. a, b, e and f

3. a, b, c and f

4. a, b, d and f

Q. Question 24
Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?

Q. We read in newspapers that burning of fuels is a major cause of global warming. Explain why.​

Q.

Petroleum was formed from organisms living in the sea.

1. True

2. False

Q. Petroleum and coal can be prepared in laboratory.

1. True

2. False

Q.

Petroleum was formed from organisms: (a) living on the land (b) living on the plants (c) living in the sea (d) living on the rocks.

Q.

Fill in the blanks:

______ is the main gas which causes global warming.

Q.

(a) What are fossil fuels ? Name three fossil fuels.

(b) Describe how, fossil fuels were formed.

Q. Read the following statements and select the correct ones.
A. Coal, petroleum and natural gas are fossil fuels.
B. Coal and natural gas are exhaustible resources.
C. Coke is used in the manufacture of steel.
D. Fossil fuels are present in limited quantities.

1. A and B
2. A, B and C
3. A and D
4. A, B, C and D

Q.

Which of the following is an example of fossil fuel?

1. Natural gas

2. Coal

3. Petroleum

4. All of the given options.

Q.

1. Combination
2. Carbonization
3. Both A and B
4. Neutralisation

Q.

air in hill stations feels fresh and clean. why?

Q.

Why should we use fossil fuels only when absolutely necessary ?

Q. Question 6
Explain why fossil fuels are exhaustible natural resources.

Q.

Mention three important features of fossils that help in the study of evolution.

Q. Statement I: Fossil fuels are renewable sources of energy.
Statement II: Renewable sources are naturally replenished over time.

1. Only statement I is correct.
2. Only statement II is correct.
3. Both statements are correct.
4. Both statements are incorrect.

Q. Biogas is a mixture of carbon dioxide and methane.

1. True
2. False

Q. Mention the gases responsible for causing acid rain.

Q. Carbon dioxide is not a greenhouse gas.

1. False
2. True

Q.

The softest and hardest coal among the following are _________ and ___________ respectively.

1. lignite and anthracite

2. Anthracite and Bituminous

3. Sub-Bituminous and lignite

4. Anthracite and Lignite

Q.

Name a fossil fuel other than coal and petroleum.

Q. _____________ is the purest variety of coal, it has $92\%-98\%$ of carbon content. It is difficult to ignite them but once ignited, it burns for a long time and large amount of heat is liberated.

1. Bituminous
2. Peat
3. Lignite
4. Anthracite

Q. Write True/False against the following statements and also correct the false statement.​

(a) A physical process in which a substance reacts with oxygen to give off heat is called combustion.​
(b) Water is the best extinguisher for fires involving electrical equipment.
(c) Alcohol, CNG, and LPG are inflammable substances.
(d) Increase concentration of nitrogen in the air is believed to cause global warming.
(e) Greater the calorific value, the better the fuel.​
(f) Middle zone is the hottest zone of a flame.​
(g) The substances which vapourize during burning, give flame.

Q.

Rocks formed by the accumulation of sediments over long periods of time are called ______ rocks.

Q.

Fill in the following blanks with suitable words :

(a) Fossil fuels are ___ , ___ and ___ .

(b) Coal contains mainly ___ .

(c) The slow process of conversion of dead vegetation into coal is callled ___ .

(d) The process of separation of different constituents from petroleum is called ___ .

(e) The least polluting fuel for vehicles is ___ .

(f) The burning of fossil fuels causes air ___ and also leads to global ___ .

Q.

Why is natural gas a preferable fossil fuel?

1. It releases highest amount of energy when burnt.

2. It is easily transportable through pipes.

3. It is most abundant fossil fuel on earth.

4. It is has natural odour.

Q. is an organic substance which is formed due to the partial decomposition of dead matter.

1. Soil
2. Humus
3. Peat
4. Coal
5. Clay