ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

Try The 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

Pair production take place when energy ofγ-rays photon is

Question # 2

Neutron was discovered in

Question # 3

γ-rays are

Question # 4

The half lie of radium-226 is

Question # 5

The energy is found from Einstein's mass energy relation is called

Question # 6

The half life of uranium-238 is

Question # 7

The chemical properties of all the isotopes of an elements are

Question # 8

Mass of proton is

Question # 9

Nucleus of a hydrogen atom may contain:

Question # 10

Three quarks make:

Question # 11

Structure of the nucleus was explained by

Question # 12

The energy acquired by a mass of 1g moving with the speed of light is

Question # 13

For Protium, the mass defect is:

Question # 14

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 15

Neutrons are

Question # 16

1 amu is equal to

Question # 17

There is present in paraffin a large amount of:

Question # 18

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

Question # 19

In radio-active decay, the original element which disintegrate to another element is called

Question # 20

The range of particle depends upon the factor

Question # 21

U-238 present in the natural uranium is about:

Question # 22

Fraction of the decaying atoms per unit time is called

Question # 23

The counter, which also provides the power to the G.M. tube is called:

Question # 24

Neutron was suggested to be in the nucleus by:

Question # 25

The most abundant isotope of neon is

Question # 26

Which are not the elementary particles?

Question # 27

A curie represents a very strong source of

Question # 28

When a nucleus emits an alpha particles, its charge number decreases by

Question # 29

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

Question # 30

Beta particles are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
2 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
3 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
4 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
5 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
6 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
7 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
8 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity
9 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
10 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these

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