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

A pair of quark and antiquark makes a:

Question # 2

When certain nucleus emits anα particle, its mass number:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Which of the following material has smaller has life

Question # 7

Nucleus consists of

Question # 8

Nuclei that have the same charge number but different mass number are called

Question # 9

In 1932 Chadwick discovered

Question # 10

A curie represents a very strong source of

Question # 11

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

Question # 12

The nucleus/nuclei of hydrogen is/are:

Question # 13

Radioactivity was discovered by

Question # 14

Neutron was discovered in

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
2 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
3 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
4 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
5 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
6 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
7 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
8 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
9 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
10 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons

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