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

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

Question # 2

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

Question # 3

γ-rays behave like a particle because they explain the

Question # 4

A pair of quark and antiquark makes a:

Question # 5

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 6

Curie is a unit of

Question # 7

Fraction of the decaying atoms per unit time is called

Question # 8

The number of all the protons and neutrons in a nucleus is known as

Question # 9

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

Question # 10

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

Question # 11

The half life of radioactive substances depends upon

Question # 12

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

Question # 13

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 14

The energy acquired by a mass of 1g moving with the speed of light is

Question # 15

Phenomenon of radioactivity is due to disintegration of

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
3 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
4 Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called
A. deuteron
B. deterium
C. protium
D. tritium
5 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these
6 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
7 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
8 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
9 For Protium, the mass defect is:
A. Infinite
B. Zero
C. Very large
D. A few grams
10 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these

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