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Important Questions Test: Coal & Petroleum


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20 Questions MCQ Test Science Class 8 | Important Questions Test: Coal & Petroleum

Important Questions Test: Coal & Petroleum for Class 8 2022 is part of Science Class 8 preparation. The Important Questions Test: Coal & Petroleum questions and answers have been prepared according to the Class 8 exam syllabus.The Important Questions Test: Coal & Petroleum MCQs are made for Class 8 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Coal & Petroleum below.
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Important Questions Test: Coal & Petroleum - Question 1

A Which of the following is a fossil fuel?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 1

Petroleum is a fossil fuel as it is obtained by the decomposition of the remains of plants and animals under the sea over millions of years.

Important Questions Test: Coal & Petroleum - Question 2

Where does natural gas occur?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 2

Usually petroleum and natural gas occur at the same place. Petroleum occurs as liquid, whereas natural gas is in the gaseous state above petroleum.

Important Questions Test: Coal & Petroleum - Question 3

What is the common name of petroleum?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 3

Petroleum is a thick, black colored, viscous liquid which is a rich source of different, useful and expensive products like kerosene, petrol, diesel etc., as gold, hence it is called as black gold.

Important Questions Test: Coal & Petroleum - Question 4

A What are the most common sources of energy used in automobiles?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 4

The most common sources of energy used in automobiles are petroleum and diesel.

Important Questions Test: Coal & Petroleum - Question 5

When an oil well is drilled through rocks, which of the following comes out first?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 5

In the oil wells along with petroleum, natural gas also exists. It comes out first when an oil well is drilled through rocks.

Important Questions Test: Coal & Petroleum - Question 6

By what process is petroleum refined?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 6

Petroleum is refined by the process of fractional distillation as the constituents of petroleum products are in the liquid state and differ in their boiling points.

Important Questions Test: Coal & Petroleum - Question 7

During fractional distillation, the crude petroleum is heated to

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 7

During fractional distillation, crude petroleum that is obtained from the earth's crust is heated to a temperature of about 400−500oC. The different constituents present start separating out at different heights of the fractionating column depending upon their boiling points.

Important Questions Test: Coal & Petroleum - Question 8

Identify the fuel that leaves more smoke and ash on burning.

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 8

Solid fuels leave more smoke and ash on burning because they contain a large number of impurities.

Important Questions Test: Coal & Petroleum - Question 9

What is the underlying principle based on which fractional distillation is carried out?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 9

Fractional distillation is a method of separation of liquid substances based on their different boiling points.

Important Questions Test: Coal & Petroleum - Question 10

Which of the following is used as a fuel?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 10

Gasoline is one of the products obtained during the fractional distillation of petroleum. Gasoline works as petrol. Hence, it is used as fuel in vehicles.

Important Questions Test: Coal & Petroleum - Question 11

By which of the given processes is coal formed?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 11

When dead plants and animals get buried deep under the earth, they get decomposed by the action of anaerobic bacteria. Hydrogen and oxygen escape as gases leaving behind carbon. As years pass, layers of carbon atoms are added one above the other forming a stony substance called coal, this process is called carbonization.

Important Questions Test: Coal & Petroleum - Question 12

Which of the following has the lowest percentage of carbon?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 12

Coal is of four different varieties: peat, lignite, bituminous and anthracite. Among these, peat is the low grade quality coal. It is formed during the starting stage of coal formation. It has the lowest percentage of carbon around 10%-20%.

Important Questions Test: Coal & Petroleum - Question 13

Which of the forms of coal has the highest percentage of carbon?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 13

Anthracite is a fine quality coal. It contains the highest percentage of carbon. It contains 94-98% carbon.

Important Questions Test: Coal & Petroleum - Question 14

What do fuels combine with to produce heat and light?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 14

As oxygen is a supporter of combustion, fuels burn in oxygen to produce heat and light.

Important Questions Test: Coal & Petroleum - Question 15

What does natural gas mainly consist of?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 15

Natural gas is a mixture of methane, ethane, propane, butane, carbon dioxide, nitrogen and oxygen. But methane CH4 constitutes a major percentage of about 85.

Important Questions Test: Coal & Petroleum - Question 16

What does gobar gas produced from animal and plant waste contain?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 16

 

Gobar gas (produced by the decomposition of animal dung, domestic and agricultural waste in the presence of anaerobic bacteria) contains methane in bulk (50-68%) and other gases in relatively low proportions, i.e. CO2(25−35)

Important Questions Test: Coal & Petroleum - Question 17

In LPG cylinder, how is the gas liquified?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 17

Generally, gases are liquified by applying high pressure (or) low temperature. In LPG cylinders especially, the gas is liquified by applying high pressure and it is stored in cylinders.  

Important Questions Test: Coal & Petroleum - Question 18

In fractional distillation of petroleum, where do the vapours with highest boiling point condense?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 18

In fractional distillation of petroleum, the vapours with the highest boiling point cannot move up in the fractionating column, (as they have low vapour pressure). So, the liquids with high boiling points condense in the lowest (tray) portion of the fractionating tower.

Important Questions Test: Coal & Petroleum - Question 19

Why is kerosene oil regarded more suitable than petrol in oil lamps?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 19

Kerosene oil is more suitable than petrol in oil lamps because kerosene oil is less volatile than petrol. It costs less and is easy to handle.  

Important Questions Test: Coal & Petroleum - Question 20

Where is kerosene mainly used?

Detailed Solution for Important Questions Test: Coal & Petroleum - Question 20

Kerosene is mainly gused as a fuel in jet engines.

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