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

The number if neutrons in the nucleus of 92U235are

Question # 2

The diameter of an atom is of the order

Question # 3

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

Question # 4

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

Question # 5

Rate of decay is actually described by.

Question # 6

Curie is a unit of

Question # 7

1 amu is equal to.

Question # 8

Fraction of the decaying atoms per unit time is called

Question # 9

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

Question # 10

Marie curie and Pierre curie discovered:

Question # 11

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

Question # 12

Radioactivity

Question # 13

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

Question # 14

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

Question # 15

Neutron was discovered by

Question # 16

The chemical properties of all the isotopes of an elements are

Question # 17

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 18

The number of protons inside a nucleus is called

Question # 19

Phenomenon of radioactivity is due to disintegration of

Question # 20

Which of the following material has longer half life

Question # 21

Which are not the elementary particles?

Question # 22

U-238 present in the natural uranium is about:

Question # 23

The total charge of any nucleus is given as

Question # 24

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

Question # 25

In 1932 Chadwick discovered

Question # 26

Which of the following material has smaller has life

Question # 27

The penetration power ofβ-particle is

Question # 28

The rate of decay of a radioactive substance

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 A particle having the mass of electron and charge of a proton is called a
A. photon
B. position
C. antiproton
D. antineutrino
2 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
3 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
4 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
5 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
6 When a charged particle passes through matter, it produces ionization, this effect is used in
A. fission reaction
B. reactor
C. radiation detector
D. fusion reaction
7 A pair of quark and antiquark makes a:
A. Meson
B. Baryon
C. Proton
D. Neutron
8 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
9 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
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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