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

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

Question # 2

The number if neutrons in the nucleus of 92U235are

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Radiation detector are used to

Question # 7

The chemical behaviour of an atom is determined by

Question # 8

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

Question # 9

After alpha decay the atomic number of the atom

Question # 10

The penetration power ofβ-particle is

Question # 11

In wilson cloud chamber, the air becomes saturated with:

Question # 12

Nucleon means:

Question # 13

Gamma rays consist of steam of

Question # 14

Three quarks make:

Question # 15

Radioactivity

Question # 16

In 1932 Chadwick discovered

Question # 17

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

Question # 18

Neutron was suggested to be in the nucleus by:

Question # 19

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

Question # 20

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

Question # 21

The number of protons inside a nucleus is called

Question # 22

γ-rays behave like a particle because they explain the

Question # 23

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

Question # 24

The unit of decay constant is

Question # 25

γ-rays are

Question # 26

Radium was discovered by:

Question # 27

The emission of radiations take place in elements, having charge number greater than

Question # 28

The time required for a radioactive material to decrease in active by one half is called

Question # 29

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 30

Which are not the elementary particles?

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
2 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
3 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
4 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
5 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
6 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
7 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
8 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
9 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
10 Neutron was suggested to be in the nucleus by:
A. Rutherford in 1920
B. Bohar in 1913
C. Dirac in 1928
D. Anderson in 1932

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