Physics MCQs for Class 12 with Answers Chapter 13 Nuclei

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 13 Nuclei. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Nuclei MCQs Pdf with Answers to know their preparation level.

Nuclei Class 12 Physics MCQs Pdf

1. The set which represent the isotope, isobar, and isotone respectively is
Physics MCQs for Class 12 with Answers Chapter 13 Nuclei

Answer

Answer: d


2. The mass number of iron nucleus is 56 the nuclear density is
(a) 2.29 × 1016 kg m-3
(b) 2.29 × 1017 kg m-3
(c) 2.29 × 1018 kg m-3
(d) 2.29 × 1015 kg m-3

Answer

Answer: b


3. Order of magnitude of density of uranium nucleus is
(a) 1020 kg m-3
(b) 1017 kg m-3
(c) 1014 kg m-3
(d) 1011 kg m-3

Answer

Answer: b


4. The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass number of the nucleus most likely to be?
(a) 27
(b) 40
(c) 56
(d) 120

Answer

Answer: a


5. The half life of a radioactive susbtance is 30 days. What is the time taken to disintegrate to 3/4th of its original mass?
(a) 30 days
(b) 15 days
(c) 60 days
(d) 90 days

Answer

Answer: c


6. The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an
(a) isomer of parent
(b) isotone of parent
(c) isotope of parent
(d) isobar of parent

Answer

Answer: c


7. During negative β-decay, an antineutrino is also emitted along with the emitted electron. Then,
(a) only linear momentum will be conserved
(b) total linear momentum and total angular momentum but not total energy will be conserved
(c) total linear momentum, and total energy but not total angular momentum will conserved
(d) total linear momentum, total angular momentum and total energy will be conserved

Answer

Answer: d


8. Consider α and β particles and γ-rays each having an energy of 0.5 MeV. In the increasing order of penetrating power, the radiation are respectively
(a) α, β, γ
(b) α, γ, β
(c) β, γ, α
(d) γ β, α

Answer

Answer: a


9. An electron emitted in beta radiation originates from
(a) inner orbits of atom
(b) free electrons existing in the nuclei
(c) decay of a neutron in a nuclei
(d) photon escaping from the nucleus

Answer

Answer: c


10. Complete the series 6He → e + 6Li +
(a) neutrino
(b) antineutrino
(c) proton
(d) neutron

Answer

Answer: b


11. An element A decays into an element C by a two step process A → B+ 2He4 and B → C + 2e. Then,
(a) A and C are isotopes
(b) A and C are isobars
(c) B and C are isotopes
(d) A and B are isobars

Answer

Answer: a


12. The equation 41 1H+ → 24He2+ + 2e + 26 MeV
represents
(a) β-decay
(b) γ-decay
(c) fusion
(d) fission

Answer

Answer: c


13. Light energy emitted by star is due to
(a) breaking of nuclei
(b) joining of nuclei
(c) burning of nuclei
(d) reflection of solar light

Answer

Answer: b


14. In nuclear reaction, there is conservation of
(a) mass only
(b) energy only
(c) momentum only
(d) mass, energy and momentum

Answer

Answer: d


15. In nuclear reactors, the control rods are made of
(a) cadmium
(b) graphite
(c) krypton
(d) plutonium

Answer

Answer: a


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