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

00:00
Question # 1

A pair of quark and antiquark makes a:

Question # 2

Radioactivity was discovered by

Question # 3

Neutrons are

Question # 4

Gamma rays consist of steam of

Question # 5

Beta particles are

Question # 6

The nucleus/nuclei of hydrogen is/are:

Question # 7

A curie represents a very strong source of

Question # 8

Mass of proton is

Question # 9

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

Question # 10

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

Question # 11

β-particles are easily deflected by collisions than heavy

Question # 12

The rate of decay of a radioactive substance

Question # 13

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

Question # 14

According to Rutherford atomic model, the positive charge in an atom

Question # 15

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

Question # 16

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

Question # 17

The rate of decay of radioactive substance

Question # 18

Structure of the nucleus was explained by

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

Marie curie and Pierre curie discovered:

Question # 25

The range ofβ-particle in air is greater than that ofα-particle by

Question # 26

Neutron was suggested to be in the nucleus by:

Question # 27

Radioactivity is

Question # 28

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

Question # 29

The figure 1.007276μ shows the mass of an:

Question # 30

The chemical behaviour of an atom is determined by

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
2 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity
3 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
4 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
5 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
6 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
7 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
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 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
10 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

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