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

The penetration power ofβ-particle is

Question # 2

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 3

The unit of decay constant is:

Question # 4

Mass of proton is

Question # 5

The time required for a radioactive material to decrease in active by one half is called

Question # 6

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

Question # 7

1 amu is equal to

Question # 8

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

Question # 9

γ-rays are

Question # 10

In wilson cloud chamber, the air becomes saturated with:

Question # 11

The number of isotopes of hydrogen are

Question # 12

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

Question # 13

The number of all the protons and neutrons in a nucleus is known as

Question # 14

The amount of energy equivalent to 1 a.m.u is

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these
2 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
3 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
4 The half life of uranium-238 is
A. 6.2 x 109years
B. 4.5 x 109days
C. 4.5 x 109years
D. 1.3 x 106years
5 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
6 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
7 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
8 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
9 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these
10 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

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