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

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

Question # 2

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

Question # 3

γ-rays are

Question # 4

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

Question # 5

Radioactivity is

Question # 6

Neon gas have three isotopes whose atomic numbers are

Question # 7

Radioactivity was discovered by:

Question # 8

The unit of decay constant is:

Question # 9

Mass of proton is of order of

Question # 10

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 11

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 12

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

Question # 13

γ-rays behave like a particle because they explain the

Question # 14

Which are not the elementary particles?

Question # 15

The number of protons inside a nucleus is called

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Neon gas have three isotopes whose atomic numbers are
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
2 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
3 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
4 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
5 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
6 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
7 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
8 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
9 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
10 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four

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