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

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

Question # 2

When certain nucleus emits anα particle, its mass number:

Question # 3

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

Question # 4

The isotope/s of hydrogen is /are:

Question # 5

Mass of neutron is

Question # 6

1 amu is equal to

Question # 7

Mass of proton is of order of

Question # 8

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

Question # 9

γ-rays are

Question # 10

A mass spectrograph sort out

Question # 11

Nucleus consists of

Question # 12

The nucleus/nuclei of hydrogen is/are:

Question # 13

Curie is a unit of

Question # 14

Beta particles are

Question # 15

The number of isotopes of hydrogen are

Question # 16

The penetration power ofβ-particle is

Question # 17

Fraction of the decaying atoms per unit time is called

Question # 18

A curie represents a very strong source of

Question # 19

Nucleus of a hydrogen atom may contain:

Question # 20

Pair production take place when energy ofγ-rays photon is

Question # 21

Three quarks make:

Question # 22

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

Question # 23

Neutron was discovered by

Question # 24

The unit of decay constant is:

Question # 25

The rate of decay of radioactive substance

Question # 26

Radioactivity

Question # 27

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

Question # 28

Which of the following material has smaller has life

Question # 29

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

Question # 30

β-particles are easily deflected by collisions than heavy

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
2 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
A. A - Z
B. A
C. Z
D. A + Z
3 The amount of energy equivalent to 1 a.m.u is
A. 9.315 Mev
B. 93.15 Mev
C. 931.5 Mev
D. 2.22 Mev
4 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
5 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
6 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
7 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
8 Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called
A. deuteron
B. deterium
C. protium
D. tritium
9 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
10 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these

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