MCQ based Questions SMMCQ025

1. Which of the following is used as a moderator in nuclear reactor?

A. Thorium
B. Graphite
C. Radium
D. Ordinary water

Answer: Option B

2. Which among the following is a positively charged particle emitted by a radioactive element?

A. Beta ray
B. Alpha ray
C. Cathode ray
D. Gamma ray

Answer: Option B

3. Atoms are composed of

A. electrons and protons
B. electrons only
C. protons only
D. electrons and nuclei

Answer: Option D

4. In an atomic explosion, enormous energy is released which is due to

A. conversion of chemical energy into heat energy
B. conversion of mechanical energy into nuclear energy
C. conversion of mass into energy
D. conversion of neutrons into protons

Answer: Option C

5. Isotopes are separated by

A. crystallization
B. sublimation
C. distillation
D. filtration

Answer: Option C