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

Pair production take place when energy ofγ-rays photon is

Question # 2

A pair of quark and antiquark makes a:

Question # 3

The number if neutrons in the nucleus of 92U235are

Question # 4

1 amu is equal to.

Question # 5

The chemical behaviour of an atom is determined by

Question # 6

Radium was discovered by:

Question # 7

Three quarks make:

Question # 8

In wilson cloud chamber, the air becomes saturated with:

Question # 9

Radioactivity was discovered by

Question # 10

Alfa , beta and gamma rays are emitted from a radio-active substance

Question # 11

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 12

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

Question # 13

Fraction of the decaying atoms per unit time is called

Question # 14

The range ofβ-particle in air is greater than that ofα-particle by

Question # 15

The unit of decay constant is:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
2 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
3 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
4 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
5 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
6 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
7 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
8 A particle having the mass of electron and charge of a proton is called a
A. photon
B. position
C. antiproton
D. antineutrino
9 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
10 Radiation detector are used to
A. measure intensity of radiation
B. measure energy of radiation
C. difference between different types of radiation
D. all the above

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