ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

Try The 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

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

Question # 2

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

Question # 3

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

Question # 4

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 5

The number of protons inside a nucleus is called

Question # 6

Which of the following material has smaller has life

Question # 7

In 1932 Chadwick discovered

Question # 8

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 9

Radioactivity

Question # 10

Radioactivity was discovered by:

Question # 11

Radioactivity was discovered by

Question # 12

Which of these is not a radiation detector

Question # 13

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

Question # 14

The isotope/s of hydrogen is /are:

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
4 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
5 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
6 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
7 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
8 The energy acquired by a mass of 1g moving with the speed of light is
A. 3 x 108J
B. 9 x 1013J
C. 3 x 1013J
D. 9 x 1016J
9 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
10 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m

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