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

Radium was discovered by:

Question # 2

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

Question # 3

The half life of radioactive substances depends upon

Question # 4

Radioactivity was discovered by

Question # 5

The number if neutrons in the nucleus of 92U235are

Question # 6

The chemical properties of an element depends upon the number of

Question # 7

Radioactivity

Question # 8

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 9

The half life of uranium-238 is

Question # 10

Nucleus consists of

Question # 11

Which are not the elementary particles?

Question # 12

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

Question # 13

Three quarks make:

Question # 14

When certain nucleus emits anα particle, its mass number:

Question # 15

The rate of decay of a radioactive substance

Question # 16

Which of the following material has smaller has life

Question # 17

Beta particles are

Question # 18

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

Question # 19

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

Question # 20

1 amu is equal to

Question # 21

Alfa particles are

Question # 22

In wilson cloud chamber, the air becomes saturated with:

Question # 23

The most abundant isotope of neon is

Question # 24

When certain nucleus emits aβ-particles, is mass number:

Question # 25

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

Question # 26

After alpha decay the atomic number of the atom

Question # 27

The range ofβ-particle in air is greater than that ofα-particle by

Question # 28

A pair of quark and antiquark makes a:

Question # 29

Which of the following material has longer half life

Question # 30

Neutron was disvovered by:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
2 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
3 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
4 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
5 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
6 Three quarks make:
A. An electron
B. A meson
C. A baryon
D. A photon
7 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
8 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
9 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
10 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons

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