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

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

Question # 2

γ-rays are

Question # 3

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

Question # 4

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

Question # 5

The number of protons inside a nucleus is called

Question # 6

The emission of radiations take place in elements, having charge number greater than

Question # 7

Mass of proton is of order of

Question # 8

In 1932 Chadwick discovered

Question # 9

A particle having the mass of electron and charge of a proton is called a

Question # 10

A curie represents a very strong source of

Question # 11

Charge on neutron is

Question # 12

When certain nucleus emits anα particle, its mass number:

Question # 13

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

Question # 14

When a nucleus emits an alpha particles, its charge number decreases by

Question # 15

In wilson cloud chamber, the air becomes saturated with:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 For Protium, the mass defect is:
A. Infinite
B. Zero
C. Very large
D. A few grams
2 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
3 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
4 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
5 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
6 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
7 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
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 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
10 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4

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