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

Phenomenon of radioactivity is due to disintegration of

Question # 2

1 amu is equal to

Question # 3

Pair production take place when energy ofγ-rays photon is

Question # 4

Which of the following material has longer half life

Question # 5

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

Question # 6

Rutherford performed an experiment on nuclear reactions in:

Question # 7

The rate of decay of a radioactive substance

Question # 8

The unit of decay constant is

Question # 9

In 1932 Chadwick discovered

Question # 10

The nucleus left after the emission of some radiation is called:

Question # 11

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

Question # 12

The unit of decay constant is:

Question # 13

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

Question # 14

In wilson cloud chamber, the air becomes saturated with:

Question # 15

Neutron was discovered in

Question # 16

How many isotopes of helium are present?

Question # 17

Radium was discovered by:

Question # 18

The number of protons inside a nucleus is called

Question # 19

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

Question # 20

The penetration power ofβ-particle is

Question # 21

Charge on proton is

Question # 22

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

Question # 23

Marie curie and Pierre curie discovered:

Question # 24

The diameter of an atom is of the order

Question # 25

A curie represents a very strong source of

Question # 26

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

Question # 27

Fraction of the decaying atoms per unit time is called

Question # 28

Which are not the elementary particles?

Question # 29

The number if neutrons in the nucleus of 92U235are

Question # 30

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

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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 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
3 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes
4 Radioactivity
A. is exhibited more by semiconductors in general
B. in exhibited more by the element when they are coupled
C. with other radioactive elements by a covalent bond
D. is an atomic property of radioactive elements
5 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
6 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
7 In his experiment on nuclear reactions, Rutherford bombardedα particles on:
A. Nitrogen
B. Hydrogen
C. Lead
D. Oxygen
8 Neon gas have three isotopes whose atomic numbers are
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
9 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
10 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)

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