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

The total charge of any nucleus is given as

Question # 2

A pair of quark and antiquark makes a:

Question # 3

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

Question # 4

Neutrons are

Question # 5

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

Question # 6

Neutron was discovered in

Question # 7

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 8

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

Question # 9

Mass of proton is of order of

Question # 10

The reciprocal of decay constant λ of a radioactive material is:

Question # 11

Curie is a unit of

Question # 12

The rate of decay of radioactive substance

Question # 13

Different radioactive material have

Question # 14

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 15

The nuclei of an element having the same charge number but different mass numbers are called:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 1 amu is equal to
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-34kg
D. 1.66 x 10-27kg
2 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
3 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
4 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
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 range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
7 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
8 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
9 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
10 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four

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