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

Mass of proton is of order of

Question # 2

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

Question # 3

A pair of quark and antiquark makes a:

Question # 4

The number if neutrons in the nucleus of 92U235are

Question # 5

Mass of proton is

Question # 6

The energy is found from Einstein's mass energy relation is called

Question # 7

Beta particles are

Question # 8

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

Question # 9

Different radioactive material have

Question # 10

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

Question # 11

The total charge of any nucleus is given as

Question # 12

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

Question # 13

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

Question # 14

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

Question # 15

Radium was discovered by:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
2 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
3 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
4 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
5 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
6 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
7 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
8 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
9 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
10 When a charged particle passes through matter, it produces ionization, this effect is used in
A. fission reaction
B. reactor
C. radiation detector
D. fusion reaction

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