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

00:00
Question # 1

The half lie of radium-226 is

Question # 2

Radioactivity was discovered by

Question # 3

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

Question # 4

Neutron was disvovered by:

Question # 5

Neutron was discovered in

Question # 6

Neutron was discovered by

Question # 7

The number of isotopes of hydrogen are

Question # 8

Heavy water is made of one oxygen atom and two atoms of:

Question # 9

Nucleus consists of

Question # 10

β-particles are easily deflected by collisions than heavy

Question # 11

A pair of quark and antiquark makes a:

Question # 12

The unit of decay constant is:

Question # 13

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

Question # 14

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

A curie represents a very strong source of

Question # 19

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

Question # 20

The total charge of any nucleus is given as

Question # 21

The nucleus/nuclei of hydrogen is/are:

Question # 22

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

Question # 23

γ-rays behave like a particle because they explain the

Question # 24

Mass of proton is of order of

Question # 25

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 26

Radioactivity was discovered by:

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

Three quarks make:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes
2 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
3 The energy acquired by a mass of 1g moving with the speed of light is
A. 3 x 108J
B. 9 x 1013J
C. 3 x 1013J
D. 9 x 1016J
4 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
5 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
6 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
7 Neon gas have three isotopes whose atomic numbers are
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
8 1 amu is equal to
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-34kg
D. 1.66 x 10-27kg
9 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
10 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times

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