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

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 2

The figure 1.007276μ shows the mass of an:

Question # 3

The number if neutrons in the nucleus of 92U235are

Question # 4

The rate of decay of a radioactive substance

Question # 5

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

Question # 6

Mass of proton is of order of

Question # 7

In 1932 Chadwick discovered

Question # 8

The chemical behaviour of an atom is determined by

Question # 9

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

Question # 10

Charge on neutron is

Question # 11

How many isotopes of helium are present?

Question # 12

The number of protons inside a nucleus is called

Question # 13

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

Question # 14

The unit of decay constant is

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
3 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
4 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
5 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
6 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons
7 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
8 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
9 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
10 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4

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