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

Charge on proton is

Question # 2

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

Question # 3

The penetration power ofβ-particle is

Question # 4

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

Question # 5

Neutrons are

Question # 6

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

Question # 7

Proton was discovered by Rutherford in

Question # 8

Radium was discovered by:

Question # 9

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

Question # 10

Radiation detector are used to

Question # 11

Fraction of the decaying atoms per unit time is called

Question # 12

Curie is a unit of

Question # 13

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

Question # 14

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

Question # 15

Radioactivity was discovered by:

Question # 16

Phenomenon of radioactivity is due to disintegration of

Question # 17

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

Question # 18

Gamma rays consist of steam of

Question # 19

The range of particle depends upon the factor

Question # 20

1 amu is equal to

Question # 21

An alpha particle has a charge of

Question # 22

The half lie of radium-226 is

Question # 23

Charge on neutron is

Question # 24

Mass of neutron is

Question # 25

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

Question # 26

The most abundant isotope of neon is

Question # 27

Nucleus of a hydrogen atom may contain:

Question # 28

In wilson cloud chamber, the air becomes saturated with:

Question # 29

The rate of decay of a radioactive substance

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
2 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
3 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
4 Which of the following material has smaller has life
A. uranium
B. polonium
C. radium
D. radian
5 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
6 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons
7 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
8 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
9 Binding energy per nucleus is
A. greater for heavy nucleus
B. least for heavy nucleus
C. greatest for light nuclei
D. decreases for medium weight niclei
10 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance

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