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

When certain nucleus emits anα particle, its mass number:

Question # 2

Neutrons are

Question # 3

The most abundant isotope of neon is

Question # 4

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 5

In wilson cloud chamber, the air becomes saturated with:

Question # 6

Radiation detector are used to

Question # 7

Beta particles are

Question # 8

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

Question # 9

γ-rays behave like a particle because they explain the

Question # 10

Which of the following material has smaller has life

Question # 11

Fraction of the decaying atoms per unit time is called

Question # 12

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

Question # 13

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 14

There is present in paraffin a large amount of:

Question # 15

Structure of the nucleus was explained by

Question # 16

The penetration power ofβ-particle is

Question # 17

The range ofβ-particle in air is greater than that ofα-particle by

Question # 18

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

Question # 19

The amount of energy equivalent to 1 a.m.u is

Question # 20

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 21

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 22

Three quarks make:

Question # 23

Curie is a unit of

Question # 24

Rate of decay is actually described by.

Question # 25

Charge on neutron is

Question # 26

Which are not the elementary particles?

Question # 27

For Protium, the mass defect is:

Question # 28

Radioactivity was discovered by

Question # 29

β-particles are easily deflected by collisions than heavy

Question # 30

Nucleon means:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these
2 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
3 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
4 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
5 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
6 A pair of quark and antiquark makes a:
A. Meson
B. Baryon
C. Proton
D. Neutron
7 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
A. A - Z
B. A
C. Z
D. A + Z
8 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
9 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
10 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e

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