Q 1 :    

Which of the following nuclear fragments corresponding to nuclear fission between neutron $\left({}_0{}^{1}n\right)$ and uranium isotope $\left({}_{92}{}^{235}U\right)$ is correct?        [2024]

• ${}_{56}{}^{144}Ba+{}_{36}{}^{89}Kr+3{}_0{}^1\mathrm{n}$

   

• ${}_{56}{}^{144}Ba+{}_{36}{}^{89}Kr+4{}_0{}^{1}n$

   

• ${}_{51}{}^{153}Sb+{}_{41}{}^{99}Nb+3{}_0{}^{1}n$

   

• ${}_{56}{}^{140}Xe+{}_{38}{}^{94}Sr+3{}_0{}^{1}n$

   

Q 2 :    

In a hypothetical fission reaction

${}_{92}{X}^{236}\to {}_{56}{Y}^{141}+{}_{36}{Z}^{92}+3R$

The identity of emitted particles (R) is                   [2024]

• $\gamma -radiations$

   

• $Electron$

   

• $Neutron$

   

• $Proton$

   

Q 3 :    

The energy released in the fusion of 2 kg of hydrogen deep in the sun is $E_H$ and the energy released in the fission of 2 kg of ${}^{235}U$ is $E_U$. The ratio $\frac{E_H}{E_U}$ is approximately      

(Consider the fusion reaction as $4{}_1{}^{1}H+2e^{-}\to {}_2{}^{4}He+2v+6\gamma +26.7$ MeV, energy released in the fission reaction of ${}^{235}U$ is 200 MeV per fission nucleus  and $N_A=6.023\times {10}^{23}$)                  [2024]

• 9.13

   

• 15.04

   

• 7.62

   

• 25.6

   

Q 4 :    

The explosive in a Hydrogen bomb is a mixture of ${}_1{H}^2,{}_{1}H^3$ and ${}_{3}L{i}^6$ in some condensed form. The chain reaction is given by 

${}_{3}L{i}^6+{}_0{n}^1\to {}_{2}H{e}^4+{}_1{H}^3$

${}_1{H}^2+{}_{1}H^3\to {}_{2}H{e}^4+{}_0{n}^1$

During the explosion the energy released is approximately [Given : M(Li) = 6.01690 amu, M (${}_1{H}^2$) = 2.01471 amu, M(${}_{2}H{e}^4$) = 4.00388 amu, and 1 amu = 931.5 MeV]                       [2024]

• 28.12 MeV

   

• 12.64 MeV

   

• 16.48 MeV

   

• 22.22 MeV

   

Q 5 :    

The disintegration energy Q for the nuclear fission of ${}^{235}U\to {}^{140}Ce+{}^{94}Zr+n$ is _________ MeV.

Given atomic masses of ${}^{235}U:235.0439 u; Ce:139.905 u {}^{94}Zr:93.9063 u; n:1.0086 u,$ Value of $c^2=931 MeV.$                [2024]

Q 6 :    

Choose the correct nuclear process from the below options

$[p:\text{proton}, n:\text{neutron}, e^{-}:\text{electron}, e^{+}:\text{positron}, \nu :\text{neutrino}, \overline{\nu }:\text{antineutrino}]$             [2025]

• $n\to p+e^{-}+\overline{\nu }$

   

• $n\to p+e^{-}+\nu$

   

• $n\to p+e^{+}+\overline{\nu }$

   

• $n\to p+e^{+}+\nu$

   

Q 7 :    

Match the List I with List II                             [2025]

	List I		List II
(A)	${}_0{}^1\text{n}{+}_{92}^{235}\text{U}{\to }_{54}^{140}\text{Xe}{+}_{38}^{94}\text{Sr}+2{ }_0^1\text{n}$	(I)	Chemical reaction
(B)	$2{\text{H}}_2+{\text{O}}_2\to 2{\text{H}}_2\text{O}$	(II)	Fusion with +ve Q value
(C)	${}_1{}^2\text{H}{+}_1^2\text{H}{\to }_2^3\text{He}{+}_0^1\text{n}$	(III)	Fission
(D)	${}_1{}^1\text{H}{+}_1^3\text{H}{\to }_1^2\text{H}{+}_1^2\text{H}$	(IV)	Fusion with −ve Q value

 

Choose the correct answer from the options given below:

• A–II, B–I, C–III, D–IV

   

• A–III, B–I, C–II, D–IV

   

• A–II, B–I, C–IV, D–III

   

• A–III, B–I, C–IV, D–II