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

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Question # 1

Neutron was suggested to be in the nucleus by:

Question # 2

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

Question # 3

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

Question # 4

Charge on neutron is

Question # 5

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

Question # 6

1 amu is equal to.

Question # 7

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

Question # 8

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 9

The range of particle depends upon the factor

Question # 10

The unit of decay constant is:

Question # 11

Mass of proton is of order of

Question # 12

1 amu is equal to

Question # 13

Alfa particles are

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

A curie represents a very strong source of

Question # 18

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

Question # 19

The half life of uranium-238 is

Question # 20

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

Proton was discovered by Rutherford in

Question # 25

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

Question # 26

How many isotopes of helium are present?

Question # 27

Nucleon means:

Question # 28

The rate of decay of a radioactive substance

Question # 29

When certain nucleus emits anα particle, its mass number:

Question # 30

The chemical properties of an element depends upon the number of

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
2 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
3 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
4 Which of these is not a radiation detector
A. Wilson cloud chamber
B. cyclotron acceleration
C. Geiger Miller counter
D. solid state detector
5 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
6 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1
7 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
8 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
9 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
10 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these

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