NEET Physics: Alternative Sources of Energy questions with solutions

Q1. Coal can be converted into:

1. synthetic petrol
2. coal gas
3. electricity
4. All of these

Answer: All of these

Coal is a versatile fossil fuel. It can be converted into synthetic petrol by chemical processing, into coal gas by gasification, and into electricity by burning it in power plants.

Q2. What is not required in the formation of biogas in a biogas plant?

1. water
2. Oxygen
3. cow-dung
4. Anaerobic bacteria

Answer: Oxygen

Biogas is formed by anaerobic bacteria, which break down organic matter like cow-dung in the absence of oxygen. Therefore, oxygen is not required; in fact, it must be excluded for efficient biogas production.