ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

Try The MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

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ECAT Physics Chapter 21 Nuclear Physics

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Question # 1

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

Question # 2

Fraction of the decaying atoms per unit time is called

Question # 3

The rate of decay of a radioactive substance

Question # 4

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

Question # 5

Marie curie and Pierre curie discovered:

Question # 6

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

Question # 7

The chemical properties of an element depends upon the number of

Question # 8

The range of particle depends upon the factor

Question # 9

The total charge of any nucleus is given as

Question # 10

Electrons are

Question # 11

The unit of decay constant is:

Question # 12

Phenomenon of radioactivity is due to disintegration of

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
2 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
3 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
4 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
5 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
6 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
7 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these
8 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
9 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
10 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

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