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

Beta particles are

Question # 2

The rate of decay of a radioactive substance

Question # 3

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

Question # 4

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 5

Pair production take place when energy ofγ-rays photon is

Question # 6

The counter, which also provides the power to the G.M. tube is called:

Question # 7

The penetration power ofβ-particle is

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The unit of decay constant is:

Question # 13

The isotope/s of hydrogen is /are:

Question # 14

Mass of neutron is

Question # 15

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
2 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
3 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
4 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
5 Neutron was suggested to be in the nucleus by:
A. Rutherford in 1920
B. Bohar in 1913
C. Dirac in 1928
D. Anderson in 1932
6 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
7 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
8 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
9 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
10 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
A. A - Z
B. A
C. Z
D. A + Z

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