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

Alfa , beta and gamma rays are emitted from a radio-active substance

Question # 2

Radiation detector are used to

Question # 3

Gamma rays consist of steam of

Question # 4

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

Question # 5

The number if neutrons in the nucleus of 92U235are

Question # 6

Mass of proton is

Question # 7

The half life of radioactive substances depends upon

Question # 8

Which of the following material has smaller has life

Question # 9

The range of particle depends upon the factor

Question # 10

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

Question # 11

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

Question # 12

Which of the following material has longer half life

Question # 13

The chemical behaviour of an atom is determined by

Question # 14

Marie curie and Pierre curie discovered:

Question # 15

U-238 present in the natural uranium is about:

Question # 16

In wilson cloud chamber, the air becomes saturated with:

Question # 17

The unit of decay constant is:

Question # 18

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 19

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

Question # 20

The half life of uranium-238 is

Question # 21

The rate of decay of radioactive substance

Question # 22

How much time, theα-particle more massive than an electron

Question # 23

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 # 24

The isotope/s of hydrogen is /are:

Question # 25

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

Question # 26

How many isotopes of helium are present?

Question # 27

Rutherford performed an experiment on nuclear reactions in:

Question # 28

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

Question # 29

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

Question # 30

Neutrons are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
2 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
3 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
4 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
5 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
6 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
7 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
8 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
9 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
10 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5

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