Question

Which of the following is not used as a rocket fuel?

• A. Synthetic rubber
• B. Liquid hydrogen
• C. Paraffin
• D. Liquid nitrogen

Answer 1

The correct option is D

Liquid nitrogen

Explanation for the correct answer-

Option (D)

1. Liquid nitrogen is not used as a rocket fuel.
2. It is a liquid at a very low temperature.
3. At normal temperature it is a gas.
4. When nitrogen boils, excess pressure will be created which can explode the nitrogen tank when we store liquid nitrogen.

Explanation for the incorrect options-

1. Option (A) Synthetic rubber- It is one of the most popular rocket fuels.
2. Option (B) Liquid hydrogen- It is light and most popular rocket fuel due to his lowest molecular weight etc.
3. Option (C) Paraffin- It is also the solid fuel.

Hence, option (D) is the correct option.