NCERT Solutions for class 12 Physics | Chapter 13 - Nuclei

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Questions
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

Nuclei

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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