Nuclear Stability

Q.

The total number of forces in the universe are:

1. even

2. odd

3. a multiple of three

4. could be any of these

Q.

___force is a short range force.

Q. ___force is a short range force.

Q.

Which of the following atomic mass of Uranium is the most radioactive?

1. 238

2. 235

3. 248

4. 226

Q.

Gamma rays are among the highest energy electromagnetic radiation because:

1. Gamma rays are emitted due to alpha decay.
2. They are emitted from radioactive elements.
3. All of the above.
4. They are the consequence of nuclear energy transitions and nuclei have very high difference between the allowed energy states, of the order of few MeVs.

Q.

The mass defect in a nucleus is because of:

1. nucleons

2. positrons

3. electrons

4. both electrons and protons

Q.

Match the following for a pair of protons:
1. Electrostatic Force I. AttractiveStrong
2. Nuclear Force II. Repulsive

1. 1-II, 2-II

2. 1-II, 2-I

3. 1-I, 2-I

4. 1-I, 2-II

Q.

A nucleus of mass $M+△m$ is at rest and decays into two daughter nuclei of equal mass $\frac{M}{2}$ each. Speed of light is $c$.
The binding energy per nucleon for the parent nucleus is $E_1$ and that for the daughter nuclei is $E_2$. Then

1. $E_2=E_1$

2. $E_1>E_2$

3. $E_2>E_1$

4. $E_1=2E_2$