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 ${}_1{}^2\mathrm{H}+{}_1{}^3\mathrm{H}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }<mspace\; width="1em"></mspace>{}_2{}^4\mathrm{H}+{}_0{}^1\mathrm{n}$, if the binding energies of ${}_1{}^2\mathrm{H},<mspace\; width="1em"></mspace>{}_1{}^3\mathrm{H}$ 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.

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

The nuclear reaction ${}_1{}^2\mathrm{H}+{}_1{}^2\mathrm{H}\to {}_2{}^4\mathrm{He}$ (mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is

(1) Fusion reaction releasing 24 MeV energy

(2) Fusion reaction absorbing 24 MeV energy

(3) Fission reaction releasing 0.0258 MeV energy

(4) Fission reaction absorbing 0.0258 MeV energy