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

Mass of proton is of order of

Question # 2

Neutron was discovered in

Question # 3

Phenomenon of radioactivity is due to disintegration of

Question # 4

The rate of decay of a radioactive substance

Question # 5

Which are not the elementary particles?

Question # 6

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 7

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

Question # 8

The unit of decay constant is:

Question # 9

Structure of the nucleus was explained by

Question # 10

Neutron was suggested to be in the nucleus by:

Question # 11

A pair of quark and antiquark makes a:

Question # 12

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

Question # 13

Radium was discovered by:

Question # 14

Radioactivity is

Question # 15

Nucleus of a hydrogen atom may contain:

Question # 16

How many isotopes of helium are present?

Question # 17

γ-rays behave like a particle because they explain the

Question # 18

The diameter of an atom is of the order

Question # 19

Curie is a unit of

Question # 20

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

Question # 21

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 22

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

Question # 23

The isotope/s of hydrogen is /are:

Question # 24

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

Question # 25

A mass spectrograph sort out

Question # 26

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

Question # 27

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

Question # 28

An alpha particle has a charge of

Question # 29

The number of isotopes of hydrogen are

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
3 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these
4 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
5 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
6 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
7 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
8 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
9 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
10 Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called
A. deuteron
B. deterium
C. protium
D. tritium

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