For the nuclear reaction:

${}_{92}U_{235}$ $+$ ${}_{0}n_1$ $\to$ ${}_{56}B{a}^{144}$ $$ $+$ $...$ $$ $+$ $3_0{n}^1$

The blank space can be filled by:

1. ${}_{26}K{r}^{89}$

2.  ${}_{36}K{r}^{89}$

3. ${}_{26}S{r}^{90}$

4.  ${}_{38}S{r}^{89}$

Fusion reaction takes place at a higher temperature because:

Which of the following is used as a moderator in nuclear reactors? 

1. Plutonium 

2. Cadmium 

3. Heavy water

4. Uranium 

Which of the following are suitable for the fusion process?

If in nuclear reactor using U²³⁵ as fuel, the power output is 4.8 MW, the number of fissions per second is:
(Energy released per fission of U²³⁵ = 200 MeV watts, 1 eV = 1.6 X 10^–19 J)

1. 1.5×10¹⁷           

2. 3×10¹⁹           

3. 1.5×10²⁵           

4. 3×10²⁵

Solar energy is due to:

1. fusion reaction.

2. fission reaction.

3. combustion reaction.

4. chemical reaction.

The statement which is incorrect about nuclear force between two protons is?

The power obtained in a reactor using $U^{235}$ disintegration is 1000 kW. The mass decay of \(U^{235}\) per hour is:

1. 1 microgram           

2. 10 microgram       

3. 20 microgram     

4. 40 microgram

How long can an electric lamp of 100 W be kept glowing by fusion of 2.0 kg of deuterium? Take the fusion reaction as:

${}_1{}^{2}H+{}_1{}^{2}H$ $\to$ ${}_2{}^{3}He+n+3.27$ $MeV$.

If the nuclear force between two protons, two neutrons and between a proton and a neutron is denoted by $F_{pp},$ $F_{nn}$ $and$ $F_{pn}$ respectively, then:

1. $F_{pp}\approx F_{nn}\approx F_{pn}$

2. $F_{pp}\ne F_{nn}$ $and$ $F_{pn}=F_{nn}$

3. $F_{pp}=F_{nn}=F_{pn}$

4. $F_{pp}\ne F_{nn}\ne F_{pn}$