ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

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

Try The 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

U-238 present in the natural uranium is about:

Question # 2

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

Question # 3

Mass of neutron is

Question # 4

γ-rays are

Question # 5

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

Question # 6

Neutron was disvovered by:

Question # 7

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

Question # 8

The unit of decay constant is:

Question # 9

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

Question # 10

Radioactivity was discovered by

Question # 11

Fraction of the decaying atoms per unit time is called

Question # 12

The number of isotopes of hydrogen are

Question # 13

Beta particles are

Question # 14

The penetration power ofβ-particle is

Question # 15

γ-rays behave like a particle because they explain the

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 In his experiment on nuclear reactions, Rutherford bombardedα particles on:
A. Nitrogen
B. Hydrogen
C. Lead
D. Oxygen
2 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
3 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
4 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
5 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
6 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
7 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
8 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
9 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
10 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these

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