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

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 # 2

A particle having the mass of electron and charge of a proton is called a

Question # 3

Nucleon means:

Question # 4

The rate of decay of a radioactive substance

Question # 5

Mass of neutron is

Question # 6

1 amu is equal to.

Question # 7

In wilson cloud chamber, the air becomes saturated with:

Question # 8

Structure of the nucleus was explained by

Question # 9

The range of particle depends upon the factor

Question # 10

Neutrons are

Question # 11

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

Question # 12

The number of protons inside a nucleus is called

Question # 13

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

Question # 14

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

Question # 15

The penetration power ofβ-particle is

Question # 16

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

Question # 17

Neutron was discovered by

Question # 18

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 19

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

Question # 20

There is present in paraffin a large amount of:

Question # 21

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

Question # 22

The chemical properties of all the isotopes of an elements are

Question # 23

Mass of proton is

Question # 24

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

Question # 25

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 # 26

The half lie of radium-226 is

Question # 27

Phenomenon of radioactivity is due to disintegration of

Question # 28

The half life of uranium-238 is

Question # 29

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

Question # 30

When certain nucleus emits aβ-particles, is mass number:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
2 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
3 The energy acquired by a mass of 1g moving with the speed of light is
A. 3 x 108J
B. 9 x 1013J
C. 3 x 1013J
D. 9 x 1016J
4 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
5 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg
6 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
7 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
8 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
9 A particle having the mass of electron and charge of a proton is called a
A. photon
B. position
C. antiproton
D. antineutrino
10 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143

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