ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Physics ECAT Pre Engineering 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

A curie represents a very strong source of

Question # 3

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

Question # 4

Neutron was disvovered by:

Question # 5

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

Question # 6

γ-rays behave like a particle because they explain the

Question # 7

Rutherford performed an experiment on nuclear reactions in:

Question # 8

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 9

Alfa particles are

Question # 10

In radio-active decay, the original element which disintegrate to another element is called

Question # 11

Nucleus of a hydrogen atom may contain:

Question # 12

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 13

Gamma rays consist of steam of

Question # 14

Phenomenon of radioactivity is due to disintegration of

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
2 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
3 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
4 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
5 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
6 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
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 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
9 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
10 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200

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