Class 8 Science Chapter 3 MCQ

Here, all these statements are correct. Hence, your answer will be option [D].

Petroleum was formed by the decomposition of the remains of tiny plants and animals buried under the sea millions of years ago.

Here, all these statements are correct. Hence, your answer will be option [D].

Resources which are present in unlimited quantity in nature are called in-exhaustible natural resources.

Coke is not a constituent of petroleum. Coke is prepared by heating coal in the absence of air.

Naphthalene balls are used to repel moths and other insects (in stored clothes, etc.)

Sunlight, air and water are the examples of inexhaustible nature resources. There is a never ending in nature and they can be used again and again. But coal, petroleum and natural gas are non-renewable resources of energy. By using or exhausted, no more supply of these fuels will be available in the near future.

Here, all these statements are correct. Hence, your answer will be option [D].

Coal gas, coal tar and coke are called products of coal. These products are obtained when coal is heated in the absence of air. This is because if coal is heated in the presence of air, then coal burns to produce mainly carbon dioxide gas and no other useful products obtained. The strong heating of coal in the absence of air is called destructive distillation of coal. And coal gas is a gaseous fuel which is obtained by the strong heating of coal in the absence of air during the process of coal to get coke.

Coal is formed by the decomposition of large land plants and trees buried under the earth about 300 million years ago.

Here, all these statements are correct. Hence, your answer will be option [D].

Bitumen is used for road surfacing. It is also used for water-proofing the roofs of building. Bitumen is used in making black paints.

Natural gas is called a clean fuel because it burns without producing any smoke and does not cause air pollution. In fact, natural gas is stored under high pressure as compressed natural gas. It becomes easier to store, transport and use natural gas in the form of CNG.

Exhaustible natural resources are present in limited quantity in nature and can be exhausted by human activities. Note: Coal, petroleum and natural gas, minerals, forest and wildlife, etc. are exhaustible natural resources.

The most common fuel used in homes is liquefied petroleum gas because it is obtained from petroleum and it is liquefied by compression before filling into the gas cylinders. Liquefied Petroleum Gas consists mainly of butane. LPG burns easily and it does not produce any poisonous gas on burning. LPG burns with a smokeless flame and hence does not cause air pollution.

Wildlife and minerals are exhaustible natural resources because these resources are present in a limited quantity in nature and can be exhausted by human activities.

The major component of LPG and CNG are butane and methane respectively.

Here, all these statements are correct about fossil fuel. Hence, your answer will be option [D].

Sunlight, air and water are inexhaustible natural resources that means which cannot be exhausted by human activities.

Natural gas is stored under high pressure as compressed natural gas. Note: It is easy to transport natural gas through pipes and it can be used directly for burning in homes where it can be supplied through pipes. Natural gas is used for power generation

Sunlight, air and water are the examples of inexhaustible nature resources. There is a never ending in nature and they can be used again and again. But coal, petroleum and natural gas are non-renewable resources of energy. By using or exhausted, no more supply of these fuels will be available in the near future.

Minerals, water and soil are the natural resources but plastic is a man-made material. So, plastic is not a natural resource.

Coal is used to make coke, not Coca-Cola. Coke is an almost pure form of carbon. Coal is important because it can be used as a source of heat energy. Coke is a porous and tough, black solid substance. Coke is prepared by heating coal in the absence of air. Coke is used in the manufacturing of “steel”. Although, coke burns without producing any smoke whereas coal produces a lot of smoke on burning.

Coke is prepared by heating coal in the absence of air. Coke is mainly used as a reducing agent in the extraction of metals. Such as iron, zinc etc. Coke is used in the manufacturing of Steel.

Coal tar is black liquid which have unpleasant smell and obtained from coke. Although, coal tar is a not a single compound, it is a mixture of 200 types of carbon compounds. Such as, benzene, naphthalene, phenol etc.