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

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

Question # 2

The chemical properties of an element depends upon the number of

Question # 3

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

Question # 4

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

Question # 5

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 6

The figure 1.007276μ shows the mass of an:

Question # 7

Mass of neutron is

Question # 8

Fraction of the decaying atoms per unit time is called

Question # 9

Phenomenon of radioactivity is due to disintegration of

Question # 10

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

Question # 11

Neutron was disvovered by:

Question # 12

The chemical behaviour of an atom is determined by

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

Nuclei that have the same charge number but different mass number are called

Question # 17

How much time, theα-particle more massive than an electron

Question # 18

The rate of decay of a radioactive substance

Question # 19

1 amu is equal to.

Question # 20

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 21

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

Question # 22

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 23

The emission of radiations take place in elements, having charge number greater than

Question # 24

Neutrons are

Question # 25

The half lie of radium-226 is

Question # 26

Alfa particles are

Question # 27

The energy acquired by a mass of 1g moving with the speed of light is

Question # 28

Radioactivity

Question # 29

After alpha decay the atomic number of the atom

Question # 30

A mass spectrograph sort out

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Which of these is not a radiation detector
A. Wilson cloud chamber
B. cyclotron acceleration
C. Geiger Miller counter
D. solid state detector
2 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
3 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
4 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
5 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons
6 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
7 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
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 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
10 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral

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