ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

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

In 1932 Chadwick discovered

Question # 2

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

Question # 3

Mass of neutron is

Question # 4

Proton was discovered by Rutherford in

Question # 5

The chemical properties of an element depends upon the number of

Question # 6

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 7

An alpha particle has a charge of

Question # 8

The unit of decay constant is

Question # 9

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

Question # 10

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

Question # 11

The isotope/s of hydrogen is /are:

Question # 12

U-238 present in the natural uranium is about:

Question # 13

A curie represents a very strong source of

Question # 14

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 15

The half life of radioactive substances depends upon

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
2 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
3 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
4 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
5 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200
6 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
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 thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
9 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
10 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

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