MCQ nuclei -2
Class 12 Physics Science

MCQ Questions Class 12 Nuclei With Answers

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CBSE Class 12 Nuclei Multiple Choice Questions with Answers. MCQ Questions Class 12 Nuclei with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Nuclei MCQs with Answers to know their preparation level.

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MCQ Questions Class 12 Nuclei with Answers - Set - 2

Question 1: 

Fusion reations place at high temp, because
(a) Kinetic energy is high enough to overcome repulsion between nuclei.
(b) Nuclei break up at high temperature.
(c) Atoms are ionised at high temperature.
(d) Molecules break up at high temperature.

Correct Answer – (A)

Question 2 : 

The volume of a nucleus is smaller than that of an atom by a factor of:
(a) 10
(b) 105
(c) 1015
(d) 1010

Correct Answer – (C)

Question 3 : 

The energy released in the fission of a single 23592U nucleus is 200 MeV. The fission rate of 23592U fueled reactor operating a power level of 5 Watt is
(a) 1.56 × 1014 per sec.
(b) 1.56 × 1017 per sec.
(c) 1.56 × 1020 per sec.
(d) 1.56 × 1017 per sec

Correct Answer – (B)

Question 4 : 

For the fission of heavy nucleus, neutron is more effective than the proton or a particle because
(a) Neutron is heavier than α-particle.
(b) Neutron is lighter than α-particle.
(c) Neutron moves with a small velocity.
(d) Neutron is uncharged.

Correct Answer – (D)

Question 5 : 

If 10 % of a radioactive material decays in 5 days, then the amount of the original material left after 20 days is nearly.
(a) 60%
(c) 75%
(b) 70%
(d) 66%

Correct Answer – (D)

MCQ Questions Class 12 Nuclei with Answers

Question 6 : 

Consider the fission reaction :
23696U → x117 + Y117 + 0n1 + 0n1
i.e., two nuclei of same mass numbers 117 are formed plus two neutrons. The binding energy per nuclear of X and Y is 8.5 MeV whereas U236 is 7.6 MeV. The total energy liberated will be about:
(a) 2 MeV
(b) 20 MeV
(c) 2,000 MeV
(d) 200 MeV

Correct Answer – (D)

Question 7 : 

Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is to
(a) absorb neutrons and stop chain reaction
(b) To cool the reactor
(c) To slow down the neutrons to thermal energies.
(d) To control the energy released.

Correct Answer – (C)

Question 8 : 

Which of the following is the best nuclear fuel.
(a) Thorium-236
(b) Plutonium – 239
(c) Neptunium-239
(d) Uranium-236.

Correct Answer – (B)

Question 9 : 

If the atomic masses for the parent and daughter element in a radioactive decay are Mp and Md and the mass of the electron me then the Q-value for the radioactive ß decay is given by
(a) Q = Mp C²
(b) Q = (Mp – Md – Mc) C²
(c) Q = (Mp – Md)C²
(d) Q = (Mp – md – 2Me)C².

Correct Answer – (C)

Question 10 : 

For thorium A = 232 and Z = 90. At the end of some radioactive disintegrations we obtain an isotope of lead with 20882pb. Then the number of emitted α and ß particles are
(a) α = 4, ß = 6
(b) α = 5, ß = 5
(c) α = 6, ß = 4
(d) α = 6, ß = 6

Correct Answer – (C)
MCQ Questions Class 12 Nuclei with Answers
Set 1
Set 2
Set 3
Set 4
Set 5

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