important MCQs Of Nuclear Chemistry – Multiple Choice Questions

1. Which scientist discovered Radio-activity.

A. J.J. Thomson
B. Madame Curie
C. Henry Becquerel
D. Rutherford

2. Have same atomic numbers but different atomic masses

A. Isotope
B. Atom
C. Radioisotope
D. None of these

3. When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

A. Increases only if the products are gaseous
B. Increase considerably
C. Decreases
D. Is not affected

4. Radioactive has an unstable nucleus and undergoes radioactive decay.

A. Isotope
B. Atom
C. Radioisotope
D. None of these

5. Which one of the following are Gamma rays.

A. Low energy waves
B. High energy protons
C. High energy electron
D. High energy electromagnetic waves

6. Which one of the following has no charge?

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

7. Which of the following is the smallest particle of an element that retains the properties of that element?

A. Isotope
B. Atom
C. Radioisotope
D. None of these

8. Hydrogen bomb is based on the phenomenon of

A. Nuclear explosion
B. Chemical reaction
C. Nuclear fusion
D. Nuclear fission

9. which of the following Uranium gives stable isotope of

A. Radon
B. Krypton
C. Polonium
D. Radium

10. Penetrating power of proton is

A. Greater than electron
B. Lesser than electron
C. Greater than neutron
D. None

11. The average life period of a radioactive element is

A. 1.44 T
B. 144 T
C. 0.144 T
D. 14.4 T

12. A certain nucleide has a half life period of 30 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remains.

A. 175 atoms
B. 250 atoms
C. 450 atoms
D. 75 atoms