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

Gamma rays consist of steam of

Question # 2

Mass of neutron is

Question # 3

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

Question # 4

Neutrons are

Question # 5

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

Question # 6

Phenomenon of radioactivity is due to disintegration of

Question # 7

Charge on proton is

Question # 8

Neutron was disvovered by:

Question # 9

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

Question # 10

Binding energy per nucleus is

Question # 11

The diameter of an atom is of the order

Question # 12

The number if neutrons in the nucleus of 92U235are

Question # 13

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

Question # 14

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

Question # 15

γ-rays behave like a particle because they explain the

Question # 16

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

Question # 17

The chemical properties of an element depends upon the number of

Question # 18

Radioactivity

Question # 19

The unit of decay constant is

Question # 20

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 21

Marie curie and Pierre curie discovered:

Question # 22

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

Question # 23

Charge on neutron is

Question # 24

The rate of decay of a radioactive substance

Question # 25

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

Question # 26

The penetration power ofβ-particle is

Question # 27

Radioactivity was discovered by

Question # 28

Which of the following material has longer half life

Question # 29

U-238 present in the natural uranium is about:

Question # 30

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

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Sr.# Question Answer
1 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
2 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
3 A pair of quark and antiquark makes a:
A. Meson
B. Baryon
C. Proton
D. Neutron
4 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above
5 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
6 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
7 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
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 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
10 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass

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