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

γ-rays are

Question # 2

Which are not the elementary particles?

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Radioactivity

Question # 7

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

Question # 8

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

Question # 9

The half life of uranium-238 is

Question # 10

Rate of decay is actually described by.

Question # 11

Alfa particles are

Question # 12

The half life of radioactive substances depends upon

Question # 13

Three quarks make:

Question # 14

The counter, which also provides the power to the G.M. tube is called:

Question # 15

Which of the following material has longer half life

Question # 16

Gamma rays consist of steam of

Question # 17

The unit of decay constant is

Question # 18

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

Question # 19

Fraction of the decaying atoms per unit time is called

Question # 20

Radioactivity was discovered by:

Question # 21

In wilson cloud chamber, the air becomes saturated with:

Question # 22

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

Question # 23

A mass spectrograph sort out

Question # 24

The half lie of radium-226 is

Question # 25

Neutron was disvovered by:

Question # 26

Radium was discovered by:

Question # 27

The isotope/s of hydrogen is /are:

Question # 28

Charge on proton is

Question # 29

The rate of decay of a radioactive substance

Question # 30

The penetration power ofβ-particle is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
A. A - Z
B. A + Z
C. Z
D. A
2 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
3 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral
4 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
5 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
6 Which of the following material has smaller has life
A. uranium
B. polonium
C. radium
D. radian
7 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
8 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
9 The counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
10 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52

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