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

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Question # 1

U-238 present in the natural uranium is about:

Question # 2

Neutrons are

Question # 3

Pair production take place when energy ofγ-rays photon is

Question # 4

There is present in paraffin a large amount of:

Question # 5

Curie is a unit of

Question # 6

Which of the following material has smaller has life

Question # 7

The penetration power ofβ-particle is

Question # 8

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

Question # 9

Which are not the elementary particles?

Question # 10

Mass of proton is of order of

Question # 11

Alfa particles are

Question # 12

A curie represents a very strong source of

Question # 13

Neutron was discovered by

Question # 14

A mass spectrograph sort out

Question # 15

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

Question # 16

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 # 17

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

Question # 18

The diameter of an atom is of the order

Question # 19

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

Question # 20

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

Question # 21

The number of protons inside a nucleus is called

Question # 22

Rutherford performed an experiment on nuclear reactions in:

Question # 23

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

Question # 24

Which of these is not a radiation detector

Question # 25

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

Question # 26

The number of isotopes of hydrogen are

Question # 27

The half life of radioactive substances depends upon

Question # 28

Radioactivity

Question # 29

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

Question # 30

The nucleus left after the emission of some radiation is called:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
2 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
3 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
4 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
5 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
6 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
7 Which of the following material has smaller has life
A. uranium
B. polonium
C. radium
D. radian
8 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
9 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
10 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)

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