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NCERT Solutions for class 12 Physics | Chapter 13 - Nuclei

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Free download in PDF Class 12 Physics Chapter 13 Nuclei Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) Which of the following statement is not true regarding Einsteins mass energy relation?
[A] Mass disappears to reappear as energy.
[B] Energy disappears to reappear as mass.
[C] Mass and energy are two different forms of the same entity.
[D] Mass and energy can never be related to each other.
Answer: Mass and energy can never be related to each other.
(2) Mass energy equation was propounded by
[A] Newton
[B] Madam Curie
[C] C. V. Raman
[D] Einstein
Answer: Einstein

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(3) The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium
[A] can easily be broken up
[B] is very stable
[C] can be used as fissionable material
[D] is radioactive
Answer: is very stable
(4) In γ ray emission from a nucleus
[A] only the proton number changes
[B] both the neutron number and the proton number change
[C] there is no change in the proton number and the neutron number
[D] only the neutron number changes
Answer: there is no change in the proton number and the neutron number
(5) Neutron decay in free space is given as follows

Then the parenthesis [ ] represents a

[A] neutrino
[B] photon
[C] antineutrino
[D] graviton
Answer: antineutrino
(6) The half-life period and the mean life period of a radioactive element are denoted respectively by Th and Tm. Then
[A] Th = Tm
[B] Th > Tm
[C] Th < Tm
[D] Th ≥ Tm
Answer: Th < Tm
(7) The process of radioactive radiations remains unaffected due to
[A] physical changes
[B] chemical changes
[C] electric or magnetic fields
[D] all of the above
Answer: all of the above
(8) 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
Answer: Half life
(9) hree specimens A, B, C of same radioactive element has activities 1 microcurie, 1 rutherford and 1 becquerel respectively. Which specimen has maximum mass?
[A] A
[B] B
[C] C
[D] all have equal masses
Answer: B
(10) Radioactive substance emits
[A] α-rays
[B] β-rays
[C] γ-rays
[D] All of the above
Answer: All of the above
(11) 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
Answer: Boron rods absorb excess neutrons.
(12) Fusion reactions take place at high temperature because
[A] atoms are ionised at high temperature
[B] molecules break up at high temperature
[C] nuclei break up at high temperature
[D] kinetic enrgy is high enough to overcome repulsion between nuclei
Answer: kinetic enrgy is high enough to overcome repulsion between nuclei
(13) Control rods used in nuclear reactors are made of
[A] stainless steel
[B] graphite
[C] cadmium
[D] plutonium
Answer: cadmium
(14) Half life of radioactive element depends upon
[A] amount of element present
[B] temperature
[C] pressure
[D] nature of element
Answer: nature of element
(15) The ‘rad’ is the correct unit used to report the measurement of
[A] the ability of a beam of gamma ray photons to produceions in a target
[B] the energy delivered by radiation to a target
[C] the biological effect of radiation
[D] the rate of decay of a radioactive source
Answer: the biological effect of radiation
(16) If a radioactive element is placed in an evacuated chamber, then the rate of radioactive decay will
[A] decrease
[B] remains unchanged
[C] increase
[D] none of these
Answer: remains unchanged
(17) The same radioactive nucleus may emit
[A] all the three α, β and γ one after another
[B] all the three α, β and γ radiations simultaneously
[C] only α and βsimultaneously
[D] only one α, β and γ at a time
Answer: only one α, β and γ at a time
(18) Radioactivity is
[A] irreversible process
[B] self disintegration process
[C] spontaneous
[D] all of the above
Answer: all of the above
(19) Nuclear forces exists between
[A] neutron – neutron
[B] proton – proton
[C] neutron – proton
[D] all of these
Answer: all of these
(20) The mass of an atomic nucleus is less than the sum of the masses of its constituents. This mass defect is converted into
[A] heat energy
[B] light energy
[C] electrical energy
[D] energy which binds nucleons together
Answer: energy which binds nucleons together

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