# Nuclei MCQ Questions for Class 12 Physics Chapter 13 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 13 Nuclei with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Nuclei. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

(ii) graphite
(iii) krypton
(iv) plutonium

## Q2. When the mass of a sample of a radioactive substance decreases, the mean life of the sample:

(i) increases
(ii) decreases
(iii) remain unchanged
(iv) first decreases then increases

(iii) remain unchanged

(i) 1 kg
(ii) 0.01 kg
(iii) 3.84 kg
(iv) 0.384 kg

(iv) 0.384 kg

## Q4. Particles which can be added to the nucleus of an atom without changing its chemical properties are called

(i) neutrons
(ii) electrons
(iii) protons
(iv) alpha particles

(i) neutrons

## Q5. The neutron was discovered by whom?

(i) Marie Curie
(ii) Pierre Curie
(iii) Rutherford

## Q6. The mass of an atomic nucleus is less than the sum of the masses of its constituents. This mass defect is converted into

(i) heat energy
(ii) light energy
(iii) electrical energy
(iv) energy which binds nucleons together

(iv) energy which binds nucleons together

## Q7. In nuclear reaction, there is conservation of

(i) mass only
(ii) energy only
(iii) momentum only
(iv) mass, energy and momentum

(iv) mass, energy and momentum

## Q8. Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:

(i) electron
(ii) proton
(iii) neutron
(iv) None of these

(iii) neutron

(i) 20
(ii) 10
(iii) 30
(iv) 15

(i) 20

## Q10. For a nuclear fusion process, suitable nuclei are

(i) any nuclei
(ii) heavy nuclei
(iii) lighter nuclei
(iv) nuclei lying in the middle of periodic table

(iii) lighter nuclei

## Q11. When a radioactive substance emits an α-particle, its position in the periodic table is lowered by which of the following?

(i) One place
(ii) Two places
(iii) Three places
(iv) Four places

(ii) Two places

(i) isobars
(ii) isomers
(iii) isotones
(iv) isotopes

(iii) isotones

## Q13. Light energy emitted by star is due to

(i) breaking of nuclei
(ii) joining of nuclei
(iii) burning of nuclei
(iv) reflection of solar light

(ii) joining of nuclei

## Q14. Alpha particle emitted from a radioactive material are:

(i) Helium nuclei
(ii) Hydrogen nuclei
(iii) Lithium nuclei
(iv) None of the above

(i) Helium nuclei

(i) 5 T
(ii) 6.654 T
(iii) 5.645 T
(iv) 6.654 T

(i) 5 T

## Q16. Nucleus of an atom whose atomic mass is 24 consists of

(i) 11 electrons, 11 protons and 13 neutrons
(ii) 11 electrons, 13 protons and 11 neutrons
(iii) 11 protons and 13 neutrons
(iv) 11 protons and 13 electrons

(iii) Nucleus does not contain electron.

## Q17. If alpha, beta, and gamma rays carry the same momentum, which has the longest wavelength?

(i) Alpha rays
(ii) Beta rays
(iii) Gamma rays
(iv) All have the same wavelength

(iv) All have the same wavelength

## Q18. A moderator is used in nuclear reactors in order to

(i) slow down the speed of the nuetrons
(ii) acceleerate the neutrons
(iii) increase the number of neutrons
(iv) decrease the number of neutrons

(iii) increase the number of neutrons

(i) 27
(ii) 40
(iii) 56
(iv) 120

(i) 27

## Q20. Rutherford is the unit of:

(ii) energy
(iii) photoelectric current
(iv) magnetic field

(i) isobars
(ii) isomers
(iii) isotones
(iv) isotopes

(iii) isotones

(i) 60
(ii) 20
(iii) 4
(iv) 64

(i) 60

(i) electron
(ii) proton
(iii) neutron
(iv) positron

(iii) neutron

(i) 30 days
(ii) 15 days
(iii) 60 days
(iv) 90 days

(iii) 60 days

(i) mesons
(ii) photons
(iii) electrons
(iv) positrons

(ii) photons

## Q26. Which one of the following has the identical property for isotopes?

(i) Physical property
(ii) Chemical property
(iii) Nuclear property
(iv) Thermal property

(ii) Chemical property

## Q27. Which is a non-central force?

(i) Electrostatic force
(ii) Nuclear force
(iii) Gravitational force
(iv) Spring force

(ii) Nuclear force

## Q28. Nucleus of an atom whose atomic mass is 24 consists of

(i) 11 electrons, 11 protons and 13 neutrons
(ii) 11 electrons, 13 protons and 11 neutrons
(iii) 11 protons and 13 neutrons
(iv) 11 protons and 13 electrons

(iii) 11 protons and 13 neutrons

## Q29. An electron emitted in beta radiation originates from

(i) inner orbits of atom
(ii) free electrons existing in the nuclei
(iii) decay of a neutron in a nuclei
(iv) photon escaping from the nucleus

(iii) decay of a neutron in a nuclei

(i) 0.53 MeV
(ii) 1.06 MeV
(iii) 2.12 MeV
(iv) zero

(ii) 1.06 MeV

(i) zero
(ii) Z
(iii) A – Z
(iv) A

(ii) Z

## Q32. The electron emitted in β – radiation originates from where?

(i) Inner orbits of atoms
(ii) Free electrons existing in nuclei
(iii) The decay of a neutron in nuclei
(iv) Photon escaping from the nucleus

(iii) The decay of a neutron in nuclei

(i) isobars
(ii) isomers
(iii) isotones
(iv) isotopes

(iii) isotones

(i) α, β, γ
(ii) α, γ, β
(iii) β, γ, α
(iv) γ β, α

(i) α, β, γ

(i) 0 eV
(ii) -13.6 eV
(iii) 2 eV
(iv) -27.2 eV

(iv) -27.2 eV

## Q36. Mass energy equation was propounded by

(i) Newton
(iii) C. V. Raman
(iv) Einstein

(iv) Einstein

## Q37. Nuclear forces are

(i) spin dependent and have no non-central part
(ii) spin dependent and have a non-central part
(iii) spin independent and have no non-central part
(iv) spin independent and have a non-central part

(ii) spin dependent and have a non-central part

## Q38. If radio active nuclei emits β-particle, then mass-number:

(i) increased by 1 unit
(ii) decreases by 1 unit
(iii) increases by 2 unit
(iv) decreases by 2 unit

(i) increased by 1 unit

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