ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

Heavy water is made of one oxygen atom and two atoms of:

Question # 2

Radiation detector are used to

Question # 3

When certain nucleus emits aβ-particles, is mass number:

Question # 4

The half lie of radium-226 is

Question # 5

The half life of radioactive substances depends upon

Question # 6

The reciprocal of decay constant λ of a radioactive material is:

Question # 7

Examples of moderators used in a fission reactor is/are:

Question # 8

A particle having the mass of electron and charge of a proton is called a

Question # 9

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

Question # 10

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 11

Curie is a unit of

Question # 12

The number of protons inside a nucleus is called

Question # 13

The isotope/s of hydrogen is /are:

Question # 14

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 15

The chemical properties of an element depends upon the number of

Question # 16

Neutron was disvovered by:

Question # 17

Fraction of the decaying atoms per unit time is called

Question # 18

U-238 present in the natural uranium is about:

Question # 19

The number of isotopes of hydrogen are

Question # 20

The rate of decay of a radioactive substance

Question # 21

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 22

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Question # 23

A pair of quark and antiquark makes a:

Question # 24

The number if neutrons in the nucleus of 92U235are

Question # 25

When certain nucleus emits anα particle, its mass number:

Question # 26

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 27

A curie represents a very strong source of

Question # 28

The unit of decay constant is:

Question # 29

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 30

Pair production take place when energy ofγ-rays photon is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
2 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
3 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
4 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
5 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
6 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
7 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
8 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
9 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
10 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four

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