ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

00:00
Question # 1

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 2

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 3

Curie is a unit of

Question # 4

The diameter of an atom is of the order

Question # 5

Radioactivity

Question # 6

The nucleus/nuclei of hydrogen is/are:

Question # 7

The number of isotopes of hydrogen are

Question # 8

In radio-active decay, the original element which disintegrate to another element is called

Question # 9

For Protium, the mass defect is:

Question # 10

In 1932 Chadwick discovered

Question # 11

Radioactivity was discovered by

Question # 12

The total charge of any nucleus is given as

Question # 13

Rutherford performed an experiment on nuclear reactions in:

Question # 14

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

Question # 15

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 16

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

Question # 17

Rate of decay is actually described by.

Question # 18

The nucleus left after the emission of some radiation is called:

Question # 19

Radioactivity was discovered by:

Question # 20

Structure of the nucleus was explained by

Question # 21

When certain nucleus emits aβ-particles, is mass number:

Question # 22

The chemical properties of an element depends upon the number of

Question # 23

The half life of radioactive substances depends upon

Question # 24

Beta particles are

Question # 25

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

Question # 26

Mass of proton is

Question # 27

The half life of uranium-238 is

Question # 28

Neutron was discovered by

Question # 29

γ-rays behave like a particle because they explain the

Question # 30

γ-rays are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
2 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
3 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
4 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
5 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
6 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
7 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
8 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
9 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
10 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

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