ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

γ-rays behave like a particle because they explain the

Question # 2

The unit of decay constant is

Question # 3

The energy is found from Einstein's mass energy relation is called

Question # 4

When certain nucleus emits anα particle, its mass number:

Question # 5

Radium was discovered by:

Question # 6

Gamma rays consist of steam of

Question # 7

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

Question # 8

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

Question # 9

Radiation detector are used to

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

A mass spectrograph sort out

Question # 14

Mass of proton is

Question # 15

The chemical properties of all the isotopes of an elements are

Question # 16

The range of particle depends upon the factor

Question # 17

Neutron was discovered in

Question # 18

Pair production take place when energy ofγ-rays photon is

Question # 19

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 20

The total charge of any nucleus is given as

Question # 21

In wilson cloud chamber, the air becomes saturated with:

Question # 22

Mass of proton is of order of

Question # 23

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

Question # 24

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

Question # 25

Nuclei that have the same charge number but different mass number are called

Question # 26

Heavy water is made of one oxygen atom and two atoms of:

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
2 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200
3 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
4 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
5 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
6 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
7 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
8 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
9 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
10 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143

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