Tarun Goyal Solutions for Chapter: Physics, Exercise 1: MCQs

An atom of carbon has 6 protons. Its mass number is $12$. How many neutrons are present in an atom of carbon?

The function of heavy water in a nuclear reactor is to_____.

A ball rolling along the ground gradually slows down and finally comes to rest is due to:

Paper becomes brittle and yellow with age. Why?

1. The acid content in paper causes brittleness to develop.

2. In the presence of visible light, photosensitized oxidation occurs.

3. The ultra-violet component of sunlight causes photolysis of cellulose by direct cleavage of the cellulose polymer.

Which of the following polymers is widely used for making bulletproof material?

Sodium thiosulphate is used in photography because:

The pH of water at ${25}^{o}C$ is $7$. When it is heated to ${100}^{o}C$, the pH of water:

Match List-I with List-II and select the correct answer using the codes given below the lists: