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

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Question # 1

Nucleus consists of

Question # 2

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

Question # 3

The number of all the protons and neutrons in a nucleus is known as

Question # 4

Beta particles are

Question # 5

1 amu is equal to.

Question # 6

Curie is a unit of

Question # 7

β-particles are easily deflected by collisions than heavy

Question # 8

The chemical properties of all the isotopes of an elements are

Question # 9

The range of particle depends upon the factor

Question # 10

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

Question # 11

Marie curie and Pierre curie discovered:

Question # 12

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

Question # 13

When a nucleus emits an alpha particles, its charge number decreases by

Question # 14

The unit of decay constant is:

Question # 15

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

Question # 16

Radium was discovered by:

Question # 17

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

Question # 18

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 19

Radioactivity was discovered by

Question # 20

Rate of decay is actually described by.

Question # 21

Structure of the nucleus was explained by

Question # 22

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

Question # 23

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

Question # 24

Pair production take place when energy ofγ-rays photon is

Question # 25

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

Question # 26

The rate of decay of a radioactive substance

Question # 27

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

Question # 28

The rate of decay of radioactive substance

Question # 29

Phenomenon of radioactivity is due to disintegration of

Question # 30

Neon gas have three isotopes whose atomic numbers are

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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 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
3 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes
4 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
5 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
6 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
7 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
8 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
9 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
10 Radiation detector are used to
A. measure intensity of radiation
B. measure energy of radiation
C. difference between different types of radiation
D. all the above

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