NCERT Class VIII Science Solutions: Chapter 5-Coal and Petroleum Part 2

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Question 8:

Which substance is formed by the Carbonisation of dead vegetation?

  1. Coal

  2. Coke

  3. Coal gas

  4. Coal tar

Answer: A

Question 9:

Naphthalene balls are obtained from coal tar and are used as

  1. Mosquito repellant

  2. Honey bee repellant

  3. Moth repellant

  4. Snake repellant

Answer: C

Question 10:

Which of the following is not a constituent of petroleum?

  1. Paraffin wax

  2. Lubricating oil

  3. Petrol

  4. Coke

Answer: D

Question 11:

Petroleum was formed from organisms:

  1. Living on the land

  2. Living on the plants

  3. Living in the sea

  4. Living on the rocks

Answer: C

Question 12:

Choose the correct statement from the following:

  1. It is difficult to transport natural gas through pipes.

  2. The disadvantage of natural gas is that it cannot be used directly for burning in homes.

  3. Natural gas is stored under high pressure as compressed natural gas.

  4. Natural gas cannot be used for power generation.

Answer: C

VERY SHORT ANSWER QUESTIONS

Question 13:

You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?

Answer:

Decantation

Image of what is decantation

What is Decantation

Image of what is decantation

Question 14:

What does CNG stand for and why is it considered to be a better fuel than petrol?

Answer:

CNG stands for Compressed Natural Gas. It is considered to be a better fuel because it is less polluting.