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

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 # 2

The number if neutrons in the nucleus of 92U235are

Question # 3

The chemical behaviour of an atom is determined by

Question # 4

When certain nucleus emits anα particle, its mass number:

Question # 5

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

Question # 6

Neutron was disvovered by:

Question # 7

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 8

Radiation detector are used to

Question # 9

Structure of the nucleus was explained by

Question # 10

Radioactivity

Question # 11

The half lie of radium-226 is

Question # 12

Mass of proton is of order of

Question # 13

Mass of neutron is

Question # 14

Phenomenon of radioactivity is due to disintegration of

Question # 15

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

Question # 16

Radioactivity is

Question # 17

Rate of decay is actually described by.

Question # 18

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

Question # 19

Pair production take place when energy ofγ-rays photon is

Question # 20

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

Question # 21

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

Question # 22

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 23

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

Question # 24

The diameter of an atom is of the order

Question # 25

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 26

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

Question # 27

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

Question # 28

The figure 1.007276μ shows the mass of an:

Question # 29

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

Question # 30

Neutrons are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 1 amu is equal to
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-34kg
D. 1.66 x 10-27kg
2 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
3 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
4 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
5 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
6 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
7 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
8 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
9 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
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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