Nuclear Stability

Q.

The graph of $ln\frac{R}{R_0}$ versus ln A (R radius of a nucleus and A - its mass number) is

1. a straight line

2. a parabola

3. an ellipse

4. none

Q. Which of the following is a short range force?

1. Nuclear Force
2. Electrostatic Force
3. Both of these
4. Neither of these

Q.

Is Pauli’s exclusion principle a force?

Q. Which of the following facts are inferred from the given N vs Z graph?

1. For lighter stable nuclei $\frac{N}{Z}=1$
2. For lighter stable nuclei $\frac{N}{Z}>1$
3. For heavier stable nuclei $\frac{N}{Z}=1$
4. For heavier stable nuclei $\frac{N}{Z}>1$

Q.

Outside a nucleus

1. Neutron is stable

2. Proton and neutron both are stable

3. Neutron is unstable

4. Neither neutron nor proton is stable

Q. Nucleus that does not change its state spontaneously is called a stable nuclide.

1. False
2. True

Q. Too much neutrons which are unpaired with protons lead to instability of a nucleus.

1. False
2. True

Q. Too much neutrons which are unpaired with protons lead to instability of a nucleus.

1. False
2. True

Q. $M_n$ and $M_p$ represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be

1. $M<[N{M}_n+Z{M}_p]$
2. $M>[N{M}_n+Z{M}_p]$
3. $M=[N{M}_n+Z{M}_p]$
4. $M=N[M_n+M_p]$