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

Proton was discovered by Rutherford in

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

Mass of proton is of order of

Question # 6

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

Question # 7

Alfa , beta and gamma rays are emitted from a radio-active substance

Question # 8

Radioactivity

Question # 9

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

Question # 10

After alpha decay the atomic number of the atom

Question # 11

Radioactivity is

Question # 12

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

Question # 13

The rate of decay of a radioactive substance

Question # 14

Which are not the elementary particles?

Question # 15

The nucleus/nuclei of hydrogen is/are:

Question # 16

The energy is found from Einstein's mass energy relation is called

Question # 17

When certain nucleus emits anα particle, its mass number:

Question # 18

Neutron was discovered by

Question # 19

The number of isotopes of hydrogen are

Question # 20

Neon gas have three isotopes whose atomic numbers are

Question # 21

For Protium, the mass defect is:

Question # 22

1 amu is equal to.

Question # 23

Rutherford performed an experiment on nuclear reactions in:

Question # 24

Neutron was disvovered by:

Question # 25

Radioactivity was discovered by:

Question # 26

Charge on proton is

Question # 27

The diameter of an atom is of the order

Question # 28

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

Question # 29

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

Question # 30

Charge on neutron is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
3 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
4 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
5 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
6 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
7 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
8 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above
9 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
10 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years

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