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

00:00
Question # 1

Pair production take place when energy ofγ-rays photon is

Question # 2

Structure of the nucleus was explained by

Question # 3

The chemical properties of an element depends upon the number of

Question # 4

β-particles are easily deflected by collisions than heavy

Question # 5

Neutron was discovered in

Question # 6

Charge on neutron is

Question # 7

Electrons are

Question # 8

The rate of decay of a radioactive substance

Question # 9

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

Question # 10

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

Question # 11

Nucleon means:

Question # 12

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

Question # 13

Mass of proton is of order of

Question # 14

The nucleus/nuclei of hydrogen is/are:

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these
2 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
3 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
4 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
5 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
6 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
7 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
8 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
9 There is present in paraffin a large amount of:
A. Nitrogen
B. Hydrogen
C. Carbon
D. Baryllium
10 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5

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