Question

State whether the statement given below are true or false :
1) Coke is harder and denser than charcoal.
2) Exhaustible sources can't be exhausted by the human activities.
3) Fossil fuels are inexhaustible natural resources.
4) CNG stands combined natural gas.
5) A good fuel must leave very little ash after burning.
6) We get Naphthalene ball from coal tar.
7) Petroleum is found in pure form under the sedimentary rocks.
8) Fossil fuels can be made in the laboratory.
9) Coal tar is a mixture of various substances.
10) Kerosene is not a fossil fuel.​

Answer 1

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Answer 2

$\textbf{Answer:}$

1) Coke is harder and denser than charcoal.

True

Coke is a black, tough and porous substance. It is harder and denser than charcoal.

2) Exhaustible sources can't be exhausted by the human activities.

False

Inexhaustible sources can't be exhausted by the human activities. On the other hand, exhaustible forces can easily be exhausted by human activities.

3) Fossil fuels are inexhaustible natural resources.

False

Formation of fossil fuels take millions of years.Nowadays,they are used rapidly as well.Therefore they are exhaustible natural resources.

4) CNG stands for combined natural gas.

False

CNG stands for compressed natural gas.

5) A good fuel must leave very little ash after burning.

True

It is one of the main qualities of a good fuel.It should leave a very little ash after burning.

6) We get Naphthalene ball from coal tar.

True

We get naphthalene balls from coal tar. These are used as repellents against moths.

7) Petroleum is found in pure form under the sedimentary rocks.

True

Petroleum is found in pure form under the sedimentary rocks.They are formed from dead and decaying organisms in the sea.

8) Fossil fuels can be made in the laboratory.

False

It is not possible to make fossil fuels in the laboratory since it requires a very high temperature as well as a long period of time which can't be provided in the laboratory.

9) Coal tar is a mixture of various substances.

True

Coal tar is a mixture of various substances(almost 200 substances).

10) Kerosene is not a fossil fuel.

False

Kerosene is a fossil fuel though it is more like a derivative of fuel.