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

Mass of proton is of order of

Question # 2

The amount of energy equivalent to 1 a.m.u is

Question # 3

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

Question # 4

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

Question # 5

Neon gas have three isotopes whose atomic numbers are

Question # 6

Which are not the elementary particles?

Question # 7

U-238 present in the natural uranium is about:

Question # 8

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

Question # 9

The rate of decay of radioactive substance

Question # 10

Heavy water is made of one oxygen atom and two atoms of:

Question # 11

Fraction of the decaying atoms per unit time is called

Question # 12

Radioactivity is

Question # 13

Examples of moderators used in a fission reactor is/are:

Question # 14

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

Question # 15

When certain nucleus emits anα particle, its mass number:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
2 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
3 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
4 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
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 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
7 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
8 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
9 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
10 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

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