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

Question # 2

β-particles are easily deflected by collisions than heavy

Question # 3

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

Question # 4

The number if neutrons in the nucleus of 92U235are

Question # 5

Radioactivity was discovered by:

Question # 6

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

Question # 7

The unit of decay constant is:

Question # 8

Beta particles are

Question # 9

Which of the following material has longer half life

Question # 10

When a nucleus emits an alpha particles, its charge number decreases by

Question # 11

An alpha particle has a charge of

Question # 12

Radioactivity was discovered by

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

After alpha decay the atomic number of the atom

Question # 18

Gamma rays consist of steam of

Question # 19

Rate of decay is actually described by.

Question # 20

The range of particle depends upon the factor

Question # 21

In wilson cloud chamber, the air becomes saturated with:

Question # 22

Which of the following material has smaller has life

Question # 23

The total charge of any nucleus is given as

Question # 24

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

Question # 25

Mass of neutron is

Question # 26

Binding energy per nucleus is

Question # 27

A mass spectrograph sort out

Question # 28

The isotope/s of hydrogen is /are:

Question # 29

Charge on proton is

Question # 30

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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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 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
3 The nucleus left after the emission of some radiation is called:
A. Parent nucleus
B. Daughter necleus
C. Mother necleus
D. Any of these
4 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
5 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
6 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
7 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
8 The energy is found from Einstein's mass energy relation is called
A. binding energy of electron
B. binding energy of proton
C. binding energy of neutron
D. binding energy of nucleus
9 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
10 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron

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