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

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

Question # 2

The number of protons inside a nucleus is called

Question # 3

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 4

Structure of the nucleus was explained by

Question # 5

When certain nucleus emits anα particle, its mass number:

Question # 6

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

Question # 7

Nucleus consists of

Question # 8

The half life of radioactive substances depends upon

Question # 9

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

Question # 10

γ-rays behave like a particle because they explain the

Question # 11

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

Question # 12

The diameter of an atom is of the order

Question # 13

Radioactivity is

Question # 14

Mass of proton is of order of

Question # 15

Binding energy per nucleus is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Mass of proton is
A. 1.67 x 10-27kg
B. 1.67 x 10-31kg
C. 1.66 x 10-34kg
D. 1.67 x 10-17kg
2 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
3 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
4 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
5 The energy is found from Einstein's mass energy relation is called
A. binding energy of electron
B. binding energy of proton
C. binding energy of neutron
D. binding energy of nucleus
6 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
7 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
8 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
9 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
10 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

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