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

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 2

Neutron was discovered in

Question # 3

The rate of decay of a radioactive substance

Question # 4

There is present in paraffin a large amount of:

Question # 5

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

Question # 6

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

Question # 7

The half life of radioactive substances depends upon

Question # 8

The penetration power ofβ-particle is

Question # 9

How much time, theα-particle more massive than an electron

Question # 10

Radioactivity

Question # 11

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

Question # 12

When certain nucleus emits aβ-particles, is mass number:

Question # 13

Gamma rays consist of steam of

Question # 14

The total charge of any nucleus is given as

Question # 15

The unit of decay constant is:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above
2 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
3 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
4 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
5 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
6 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
7 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
8 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
9 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
10 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

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