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NCERT Class VIII Science Solutions: Chapter 5 - Coal and Petroleum Part 2
Question 8:
Which substance is formed by the Carbonisation of dead vegetation?
- Coal
- Coke
- Coal gas
- Coal tar
Answer: A
Question 9:
Naphthalene balls are obtained from coal tar and are used as
- Mosquito repellant
- Honey bee repellant
- Moth repellant
- Snake repellant
Answer: C
Question 10:
Which of the following is not a constituent of petroleum?
- Paraffin wax
- Lubricating oil
- Petrol
- Coke
Answer: D
Question 11:
Petroleum was formed from organisms:
- Living on the land
- Living on the plants
- Living in the sea
- Living on the rocks
Answer: C
Question 12:
Choose the correct statement from the following:
- It is difficult to transport natural gas through pipes.
- The disadvantage of natural gas is that it cannot be used directly for burning in homes.
- Natural gas is stored under high pressure as compressed natural gas.
- 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
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.