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

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

Question # 2

Gamma rays consist of steam of

Question # 3

Fraction of the decaying atoms per unit time is called

Question # 4

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

Question # 5

How many isotopes of helium are present?

Question # 6

The unit of decay constant is:

Question # 7

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

Question # 8

The reciprocal of decay constant λ of a radioactive material is:

Question # 9

β-particles are easily deflected by collisions than heavy

Question # 10

Neutron was discovered in

Question # 11

U-238 present in the natural uranium is about:

Question # 12

Neutron was suggested to be in the nucleus by:

Question # 13

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

Question # 14

The chemical properties of all the isotopes of an elements are

Question # 15

In 1932 Chadwick discovered

Question # 16

Pair production take place when energy ofγ-rays photon is

Question # 17

The chemical properties of an element depends upon the number of

Question # 18

Neutron was disvovered by:

Question # 19

Charge on neutron is

Question # 20

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

Question # 21

Which of the following material has longer half life

Question # 22

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

Question # 23

A pair of quark and antiquark makes a:

Question # 24

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

Question # 25

The diameter of an atom is of the order

Question # 26

The number if neutrons in the nucleus of 92U235are

Question # 27

For Protium, the mass defect is:

Question # 28

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

Question # 29

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

Question # 30

Electrons are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
2 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
3 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
4 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
5 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
6 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
7 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
8 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
9 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
10 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick

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