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

How many isotopes of helium are present?

Question # 2

The unit of decay constant is

Question # 3

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

Question # 4

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

Question # 5

The amount of energy equivalent to 1 a.m.u is

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 11

Binding energy per nucleus is

Question # 12

Fraction of the decaying atoms per unit time is called

Question # 13

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 14

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

Question # 15

The counter, which also provides the power to the G.M. tube is called:

Question # 16

The penetration power ofβ-particle is

Question # 17

In 1932 Chadwick discovered

Question # 18

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

Question # 19

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

Question # 20

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

Question # 21

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

Question # 22

Rate of decay is actually described by.

Question # 23

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

Question # 24

Which are not the elementary particles?

Question # 25

Mass of proton is of order of

Question # 26

After alpha decay the atomic number of the atom

Question # 27

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

Question # 28

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

Question # 29

The rate of decay of radioactive substance

Question # 30

A pair of quark and antiquark makes a:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
3 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
4 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
5 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
6 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
7 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
8 Radiation detector are used to
A. measure intensity of radiation
B. measure energy of radiation
C. difference between different types of radiation
D. all the above
9 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
10 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5

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