Class 12 Physics Chapter 13 Nuclei MCQs

# Class 12 Physics Chapter 13 Nuclei MCQs

Introducing the latest Class 12 Physics MCQs for Chapter 13, complete with answers. These MCQs, aligned with the current exam pattern, are designed to enhance students’ understanding of the chapter and help them achieve high scores in their board exams.

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## Class 12 Nuclei MCQs

Explore multiple-choice questions for the Class 12 Physics chapter on Nuclei. Each question offers four options, with only one correct answer. Students need to select the right option and verify their choice with the provided answers.

Q. The density of nuclei is of the order of:

a) 1010 kg/m3

b) 1014 kg/m3

c) 1017 kg/m3

d) 1021 kg/m3

Q. A neutron can decay to:

a) Proton and electron

b) Proton, electron, and antineutrino

c) Proton and neutrino

d) Proton, electron, and neutrino

Answer: b) Proton, electron, and antineutrino

Q. The atomic number of an element is determined by:

a) Number of neutrons

b) Number of protons

c) Number of electrons

d) Sum of protons and neutrons

Also Read: Electric Charges and Fields

Q. The half-life of a radioactive substance depends on:

a) Amount of substance

b) Temperature

c) Pressure

d) Nature of substance

Q. The process of splitting a heavy nucleus into two lighter nuclei is called:

a) Fusion

b) Fission

d) Beta decay

Q. In nuclear reactors, the control rods are made of:

b) Graphite

c) Plutonium

d) Krypton

Q. The volume of a nucleus is smaller than that of an atom by a factor of:

a) 10

b) 10510^5105

c) 101010^{10}1010

d) 101510^{15}1015

Q. Which of the following is the best nuclear fuel?

a) Thorium-236

b) Plutonium-239

c) Neptunium-239

d) Uranium-236

Q. For the fission of heavy nucleus, neutron is more effective than proton because:

a) Neutron is heavier

b) Neutron is lighter

c) Neutron is uncharged

d) Neutron moves with small velocity

Q. For thorium with A=232A = 232A=232 and Z=90Z = 90Z=90, at the end of radioactive disintegrations resulting in 82208_{82}^{208}82208Pb, the number of emitted α and β particles are:

a) α = 4, β = 6

b) α = 5, β = 5

c) α = 6, β = 4

d) α = 6, β = 6

Answer: c) α = 6, β = 4

Q. The energy released in the fission of a single 92235_{92}^{235}92235U nucleus is:

a) 200 MeV

b) 300 MeV

c) 400 MeV

d) 500 MeV

Q. Heavy water is used as a moderator in nuclear reactors to:

a) Absorb neutrons

b) Slow down neutrons

c) Cool the reactor

d) Stop chain reaction

Q. The binding energy per nucleon of a nucleus is a measure of its:

a) Stability

b) Instability

d) Mass defect

Q. The half-life of a radioactive substance is the time taken for:

a) Half of the atoms to decay

b) All atoms to decay

c) The activity to become zero

Answer: a) Half of the atoms to decay

Q. The process in which a neutron decays into a proton, an electron, and an antineutrino is called:

a) Alpha decay

b) Beta decay

c) Gamma decay

d) Nuclear fusion

Q. Which of the following is a measure of a radioactive material’s instability?

a) Full life

b) Mean life

c) Half-life

d) None of these

a) Heavy

b) Strong

c) Good absorber

Q. In nuclear reactions, there is conservation of:

a) Mass only

b) Energy only

c) Momentum only

d) Mass, energy, and momentum

Answer: d) Mass, energy, and momentum

Q. Artificial radioactivity was discovered by:

a) Klaproth

b) Rontgen

c) Irene Curie and Joliot

d) P. Curie and M. Curie

Answer: c) Irene Curie and Joliot

a) Physical changes

b) Chemical changes

c) Electric or magnetic fields

d) All of the above

Answer: d) All of the above

Q. An electron emitted in beta radiation originates from:

a) Inner orbits of an atom

b) Free electrons existing in the nucleus

c) Decay of a neutron in the nucleus

d) Photon escaping from the nucleus

Answer: c) Decay of a neutron in the nucleus

Q. The binding energy per nucleon is maximum for nuclei with a mass number around:

a) 50

b) 100

c) 150

d) 200

Q. The primary function ofthe moderator in a nuclear reactor is to:

a) Slow down neutrons

b) Absorb neutrons

c) Cool the reactor

d) Accelerate neutrons

Q. Heavy stable nuclei have more neutrons than protons because:

a) Neutrons are heavier than protons

b) Electrostatic force between protons is repulsive

c) Neutrons decay into protons

d) Nuclear forces between neutrons are weaker than between protons

Answer: b) Electrostatic force between protons is repulsive

Q. The process in which two light nuclei combine to form a heavier nucleus is called:

a) Fission

b) Fusion

d) Beta decay

#### More Resources for Class 12

Q. The binding energy of a nucleus is:

a) Energy needed to break the nucleus into its constituent protons and neutrons

b) Energy needed to create the nucleus from its constituent protons and neutrons

c) Energy released during the formation of the nucleus

d) Both a and c

Answer: d) Both a and c

Q. The term ‘radioactive decay’ refers to:

a) Spontaneous disintegration of unstable atomic nuclei

b) Decay of a nucleus by emission of radiation

c) Decay of an atom by losing electrons

d) Both a and b

Answer: d) Both a and b

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