In nuclear fission 0.1% mass is converted into energy. How much electrical energy can be generated by the fission of 1kg of fuel?

1.  1 kWh

2.  10⁷ kWh

3.  2.5 kWh

4.  2.5$\times$10⁷ kWh

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV?

1.  28

2.  7

3.  4

4.  1

In the reaction ${}_1{}^2\mathrm{H}+{}_1{}^3\mathrm{H} \stackrel{ }{\to } {}_2{}^4\mathrm{H}+{}_0{}^1\mathrm{n}$, if the binding energies of ${}_1{}^2\mathrm{H}, {}_1{}^3\mathrm{H}$ and ${}_2{}^4\mathrm{H}$ are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction is

1.  $\mathrm{a}+\mathrm{b}+\mathrm{c}$

2.  $\mathrm{a}+\mathrm{b}-\mathrm{c}$

3.  $\mathrm{c}-\mathrm{a}-\mathrm{b}$

4.  $\mathrm{c}+\mathrm{a}-\mathrm{b}$

Assume that the nuclear binding energy per nuclear (B/A) versus mass number (A) is as shown in the figure. Use this plot to choose the correct choice(s) given below:

1. Fusion of two nuclei with mass number lying in the range of 51<A<100 will release energy

2. Fusion of a nucleus lying in the mass range of 200<A<260 will release energy when broken into two equal fragments

3. Both A and B

4. None of these

The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is:

1. 15

2. 30

3. 45

4. 60

The ratio of radii of nuclei ${}_{13}{}^{27}\mathrm{Al}$ and ${}_{52}{}^{\mathrm{A}}\mathrm{X}$ is 3 : 5. The number of neutrons in the nuclei of X will be
1. 52             

2. 73

3. 125             

4. 13

A radioactive nucleus \(X\) decays to a stable nucleus \(Y.\) Then, the graph of the rate of formation of \(Y\) against time \(t\) will be:

1.		2.
3.		4.

 If in a nuclear fusion process the masses of the fusing nuclei be ${\mathrm{m}}_1$ and ${\mathrm{m}}_2$ and the mass of the resultant nucleus be $m_3$, then 

(1) ${\mathrm{m}}_3={\mathrm{m}}_1+{\mathrm{m}}_2$         

(2) ${\mathrm{m}}_3=\left|{\mathrm{m}}_1+{\mathrm{m}}_2\right|$

(3) ${\mathrm{m}}_3<\left({\mathrm{m}}_1+{\mathrm{m}}_2\right)$       

(4) ${\mathrm{m}}_3>\left({\mathrm{m}}_1+{\mathrm{m}}_2\right)$

Heavy water is

(1) Water at 4$°\mathrm{C}$

(2) Compound of deuterium and oxygen

(3) Compound of heavy oxygen and heavy hydrogen

(4) Water in which soap does not lather