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Science true or false. [1 M]

Coal and Petroleum · Bihar Board (BSEB) STD 8 (BSEB - English Medium). 25 questions.

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true or false. [1 M]

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25 questions · timed · auto-graded

Question 11 Mark
State whether the following statements are true or false: Kerosene is not a fossil fuel.
Answer
False Explanation: Kerosene is a fossil fuel. It is used as a fuel for stoves, lamps and for jet aircrafts.
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Question 21 Mark
State whether the following statements are true or false: Coal tar is a mixture of various substances.
Answer
Coal tar is the product of coal which is a thick black liquid having an unpleasant smell. It is a mixture of about $200$ substances.
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Question 31 Mark
State whether the following statements are true or false: Coke is almost pure form of carbon.
Answer
True Explanation: It is a tough, porous and black substance. It is almost pure form of carbon.
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Question 51 Mark
State whether the following statements are true or false:
Fossil fuels can be made in the laboratory.
Answer
False
Explanation:
The formation of fossil fuels is a very slow process. These are formed under very high pressure and high temperature. The conditions for their formation cannot be created in the laboratory.
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Question 251 Mark
State whether the following statements are true or false: $CNG$ is more polluting than petrol.
Answer
$CNG$ is less polluting than petrol. It is a clean burning fuel. It produces $45\%$ less hydrocarbons than petrol.
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