Please refer to MCQ on Nuclei Class 12 Physics Chapter 13 with Answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Physics. Students should refer to MCQ Questions for Class 12 Physics with Answers to score more marks in Grade 12 Physics exams. Students should read the chapter Nuclei and then attempt the following objective questions.

MCQ on Nuclei Class 12 Physics Chapter 13 with Answers

MCQ on Nuclei Class 12 Physics provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The binding energy per nucleon is almost constant for many nuclei. It shows that nuclear forces are
(a) Charge independent
(b) saturated in nature
(c) short range in nature
(d) attractive in nature

Question. One milligram of matter convert into energy will give
(a) 90 joule
(b) 9 × 10³ joule
(c) 9 × 10⁵ joule
(d) 9 × 10¹⁰ joule

Question. The apparatus to find masses of positive ions or photons and to detect the isotopes is called
(a) Geiger
(b) Solid state detector
(c) Wilson and Cloud chamber
(d) Aston and Mass Spectrometer

Question. The name electron was suggested by
(a) Rutherford
(b) J.J Thomson
(c) Einstein
(d) Stoney

Question. Cadmium rods are used in nuclear reactor for
(a) Slow down the fast neutron
(b) Speeding up slow neutrons
(c) absorbing neutrons
(d) regulating the power level of the rection

Question. In a {93/41}Nb nucleus, the number of protons, neutrons, and electrons is
(a) 41, 52, 93
(b) 41, 52, 52
(c) 41, 52, 41
(d) 41, 52, 0

Question. When mass m is converted into energy it releases energy equal to
(a) mc²
(b) mc³
(c) m²c
(d mc

Question. Cosmic rays consist of
(a) Protons
(b) High energy photons
(c) Positron 
(d) All of the above

Question. Which is not radio active element
(a) Polonium
(b) Uranium
(c) Radium
(d) Hydrogen

Question. Atomic bomb is based on the principle of
(a) Nuclear Fission
(b) Nuclear Fusion
(c) Nuclear chain reaction
(d) All of the above

Question. For an atomic reactor being critical, the ratio (k) of the average number of neutrons produced and used in chain reaction
(a) depends upon the mass of the fissionable material.
(b) is greater than one.
(c) is less than one.
(d) is equal to one.

Question. Chadwick discovered neutron by the study of scattering of alpha particle from
(a) Gold Foil
(b) Nitrogen
(c) Beryllium
(d) Oxygen

Question. The binding energy of Deutron is
(a) 22.24 Mev
(b) 2.224 Mev
(c) 0.224 Mev
(d) 222.4 Mev

Question. For a nuclear fusion process, suitable nuclei are
(a) any nuclei
(b) heavy nuclei
(c) lighter nuclei
(d) nuclei lying in the middle of periodic table

Question. Which of the following of a radioactive material is a measure of its instability?
(a) Full life
(b) Mean life
(c) Half life
(d) None of these

Question. When an alpha particle is emitted from an unstable nucleus, the atomic mass number of the nucleus
(a) increases by 2.
(b) decreases by 2.
(c) increases by 4.
(d) decreases by 4.
(e) none of the above.

Question. Atomic theory was announced by Dalton in
(a) 1895
(b) 1905
(c) 1808
(d) 1708

Question. The radius of a nucleus is
(a) directly proportional to its mass number
(b) inversely proportional to its atomic weight
(c) directly proportional to the cube root of its mass number
(d) None of these

Question0. One curie is equal to
(a) 3.7 × 1010 disintegration/sec
(b) 3.2 × 108 disintegration/sec
(c) 2.8 × 1010 disintegration/sec
(d) None of these

Question. Which is a non-central force?
(a) Electrostatic force
(b) Nuclear force
(c) Gravitational force
(d) Spring force

Question. Curie is the unit of
(a) Conductivity 
(b) Binding energy
(c) Resistivity
(d) Radioactivity

Question. The atomic mass unit is defined as
(a) the mass of a proton.
(b) the mass of an electron.
(c) the mass of a hydrogen-1 atom.
(d) one twelfth the mass of a carbon-12 atom.

Question. A nuclei having same number of neutron but different number of protons / atomic number are called
(a) isobars
(b) isomers
(c) isotones
(d) isotopes

Question. 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) isobar of parent
(b) isomer of parent
(c) isotone of parent
(d) isotope of parent

Question. The electron emitted in β – radiation originates from where?
(a) Inner orbits of atoms
(b) Free electrons existing in nuclei
(c) The decay of a neutron in nuclei
(d) Photon escaping from the nucleus

Question. Mass energy equation was propounded by
(a) Newton
(b) Madam Curie
(c) C. V. Raman
(d) Einstein

Question. Boron rods in a nuclear reactor are used to
(a) absorb excess neutrons
(b) absorb alpha particle
(c) slow down the reaction
(d) speed up the reaction

Question. Natural radioactivity introduced in
(a) 1896
(b) 1996
(c) 1796
(d) 1696

Question. Nuclear forces are
(a) spin dependent and have no non-central part
(b) spin dependent and have a non-central part
(c) spin independent and have no non-central part
(d) spin independent and have a non-central part

Question. Radioactivity is
(a) irreversible process
(b) self disintegration process
(c) spontaneous
(d) all of the above

Question. Mass energy equation was propounded by
(a) Newton
(b) Madam Curie
(c) C. V. Raman
(d) Einstein

Question. If an electron jumps from Ist orbit to 4th Orbit then it will
(a) not lose energy.
(b) absorb energy.
(c) release energy.
(d) increases and decreases periodically

Question. If radio active nuclei emits β-particle, then mass-number:
(a) increased by 1 unit
(b) decreases by 1 unit
(c) increases by 2 unit
(d) decreases by 2 unit

Question. The neutron was discovered by whom?
(a) Marie Curie
(b) Pierre Curie
(c) Rutherford
(d) James Chadwick

Question. X-ray was discovered by :
(a) Becqueral
(b) Marie curie
(c) Roengton
(d) Vanlaw

Question. When the mass of a sample of a radioactive substance decreases, the mean life of the sample:
(a) increases
(b) decreases
(c) remain unchanged
(d) first decreases then increases

Question. The half life period of a radioactive material if its activity drops to (1/16)th of its initial value in 30 years is
(a) 1.5 years
(b) 3.5 years
(c) 7.5 years
(d) 15 years

Question. A radioactive isotope has a half-life of T years. The time it takes its activity to reduce to 3.125% is
(a) 5 T
(b) 6.654 T
(c) 5.645 T
(d) 6.654 T

Question. Artificial radioactivity was discovered by
(a) Klaproth
(b) Rontgen
(c) Irene Curie and Joliot
(d) P. Curie and M. Curie

Question. The helium atom does not contain
(a) two protons
(b) two electrons
(c) two neutrons
(d) six nucleons

Question. If R is the radius and A is the mass of a nucleus then the graph of log R versus log A will be:
(a) A straight line
(b) A parabola
(c) An Ellipse’
(d) None of these

Question. Alpha particle emitted from a radioactive material are:
(a) Helium nuclei
(b) Hydrogen nuclei
(c) Lithium nuclei
(d) None of the above

Question. Fusion reaction takes place, at high temperature because:
(a) nuclei break up at high temperature
(b) atoms get ionised at high temperature
(c) kinetic energy is high enough to overcome the coulomb repulsion between nuclei
(d) molecules break up at high temperature

Question. Chadwick was awarded the 1935 nobel prize in physics for his discovery of the
(a) electron
(b) proton
(c) neutron
(d) positron

Question. Rutherford experiment on the scattering of the alpha particles by thin foils establishes the existence of     
(a) Positively Charged nucleus
(b) Negatively Charged nucleus
(c) Neutron in the nucleus
(d) Distribution of charge in the atom

Question. The phenomena of radioactivity is:
(a) Exothermic change with increase or decrease with temperature
(b) increases on applied pressure
(c) nuclear process does not depend on external factors
(d) None of these

Question. 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

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

Question. Which one of following is charge less?
(a) Alpha particle
(b) Beta particle
(c) Photon particle
(d) Proton

Question. A moderator is used in nuclear reactors in order to
(a) slow down the speed of the nuetrons
(b) acceleerate the neutrons
(c) increase the number of neutrons
(d) decrease the number of neutrons

Question. Atomic number decreases with the emission of a particles from the nucleus :
(a) 1
(b) 2
(c) 3
(d) 4

Question. 1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is
(a) 63 × 10⁷ J
(b) 63 × 10¹⁰ J
(c) 63 × 10¹⁴ J
(d) 63 × 10²⁰ J

Question. The radioactivity of a sample is R₁ at a time T₁ and R₂ at a time T₂. If the half-life of the specimen is T, the number of atoms that have disintegrated in the time (T₁ – T₂) is proportional to
(a) (R₁T₁ – R₂T₂)
(b) (R₁ – R₂)
(c) (R₁ – R₂)/T
(d) (R₁ – R₂) T

Question. A radioactive element X converts into another stable element Y. Half life of X is 2 hrs. Initially only X is present. After time t, the ratio of atoms of X and Y is found to be 1 : 4, then t in hours is
(a) 2
(b) 4
(c) between 4 and 6
(d) 6

Question. After 150 days, the activity of a radioactive sample is 5000 dps. The activity becomes 2500 dps after another 75 days. The initial activity of the sample is
(a) 20000 dps
(b) 40000 dps
(c) 7500 dps
(d) 10000 dps

Question. The binding energy per nucleon for ²₁H and ⁴₂He respectively are 1.1 MeV and 7.1 MeV. The energy released in MeV when two ²₁H nuclei fuse to form ⁴₂He is
(a) 4.4
(b) 8.2
(c) 24
(d) 28.4

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