1.

Which of the following is used as a moderator in nuclear reactor?
A. Thorium B. Graphite
C. Radium D. Ordinary water
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
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 and Explanation
Answer:B
Explanation: No answer description available for this question.
3.

Atoms are composed of
A. electrons and protons B. electrons only
C. protons only D. electrons and nuclei
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.