set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Hydrogen bomb is based on the principle of

a) Controlled fission reaction

b) Uncontrolled fusion reaction

c) Controlled fusion reaction

d) Uncontrolled fission reaction

Question : 2

The ultimate product of radioactive disintegration of uranium is

a) Thorium

b) Radium

c) Lead

d) Plutonium

Question : 3

The highest temperature attained by a super conductor is

a) 133 K

b) 150 K

c) 24 K

d) 300 K

Question : 4

The half-life of a radioactive element is 5 years, then the fraction of the radioactive substance that remains after 20 years is

a) 1/8

b) 1/4

c) 1/2

d) 1/16

Question : 5

Among the following radiations, which has the highest energy?

a) Ultra-violet

b) X-ray

c) Visible

d) Infra-red

Question : 6

Photovoltaic cells are

a) Sulphur cells

b) Thermal cells

c) Solar cells

d) Molar cells