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 radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 2

Pair production take place when energy ofγ-rays photon is

Question # 3

Radioactivity

Question # 4

In 1932 Chadwick discovered

Question # 5

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

Question # 6

The half life of radioactive substances depends upon

Question # 7

Nucleus of a hydrogen atom may contain:

Question # 8

Phenomenon of radioactivity is due to disintegration of

Question # 9

Radium was discovered by:

Question # 10

A pair of quark and antiquark makes a:

Question # 11

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

Question # 12

Neutron was suggested to be in the nucleus by:

Question # 13

The half lie of radium-226 is

Question # 14

The penetration power ofβ-particle is

Question # 15

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

Question # 16

Radioactivity is

Question # 17

After alpha decay the atomic number of the atom

Question # 18

Neutrons are

Question # 19

The number of all the protons and neutrons in a nucleus is known as

Question # 20

1 amu is equal to

Question # 21

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

Question # 22

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 # 23

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

Question # 24

Which are not the elementary particles?

Question # 25

Gamma rays consist of steam of

Question # 26

γ-rays are

Question # 27

The most abundant isotope of neon is

Question # 28

The number of isotopes of hydrogen are

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
2 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
3 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
4 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
5 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
6 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
7 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these
8 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
9 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
10 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1

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