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

1 amu is equal to

Question # 2

Three quarks make:

Question # 3

A curie represents a very strong source of

Question # 4

Radioactivity

Question # 5

Curie is a unit of

Question # 6

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 7

The chemical properties of all the isotopes of an elements are

Question # 8

Structure of the nucleus was explained by

Question # 9

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

Question # 10

Charge on proton is

Question # 11

Different radioactive material have

Question # 12

Neutrons are

Question # 13

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 14

Radium was discovered by:

Question # 15

Gamma rays consist of steam of

Question # 16

Which of the following material has longer half life

Question # 17

Rutherford performed an experiment on nuclear reactions in:

Question # 18

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

Question # 19

Pair production take place when energy ofγ-rays photon is

Question # 20

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

Question # 21

The energy is found from Einstein's mass energy relation is called

Question # 22

Binding energy per nucleus is

Question # 23

In wilson cloud chamber, the air becomes saturated with:

Question # 24

In 1932 Chadwick discovered

Question # 25

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 26

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

Question # 27

The number if neutrons in the nucleus of 92U235are

Question # 28

The range of particle depends upon the factor

Question # 29

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

Question # 30

There is present in paraffin a large amount of:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
2 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
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 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
5 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
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 counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
8 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
9 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
10 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times

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