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

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

Question # 2

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 3

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

Question # 4

The number if neutrons in the nucleus of 92U235are

Question # 5

Structure of the nucleus was explained by

Question # 6

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

Question # 7

Binding energy per nucleus is

Question # 8

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

Question # 9

Neutron was disvovered by:

Question # 10

The isotope/s of hydrogen is /are:

Question # 11

Neutron was discovered by

Question # 12

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

Question # 13

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

Question # 14

The chemical behaviour of an atom is determined by

Question # 15

Phenomenon of radioactivity is due to disintegration of

Question # 16

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 # 17

1 amu is equal to

Question # 18

Electrons are

Question # 19

Radium was discovered by:

Question # 20

When certain nucleus emits anα particle, its mass number:

Question # 21

Curie is a unit of

Question # 22

In wilson cloud chamber, the air becomes saturated with:

Question # 23

Radioactivity

Question # 24

How much time, theα-particle more massive than an electron

Question # 25

The most abundant isotope of neon is

Question # 26

Which of the following material has smaller has life

Question # 27

Radioactivity was discovered by:

Question # 28

The half life of radioactive substances depends upon

Question # 29

The chemical properties of all the isotopes of an elements are

Question # 30

The diameter of an atom is of the order

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
2 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
3 Nucleus of a hydrogen atom may contain:
A. One neutron only
B. Two protons and one neutron
C. Two protons and two neutrons
D. Aany of above
4 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
5 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
6 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
7 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
8 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
9 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
10 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay

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