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

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

Question # 2

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

Question # 3

The number of isotopes of hydrogen are

Question # 4

Rutherford performed an experiment on nuclear reactions in:

Question # 5

Radium was discovered by:

Question # 6

Radioactivity was discovered by

Question # 7

Radioactivity is

Question # 8

Marie curie and Pierre curie discovered:

Question # 9

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

Question # 10

In wilson cloud chamber, the air becomes saturated with:

Question # 11

The diameter of an atom is of the order

Question # 12

Neutron was disvovered by:

Question # 13

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 14

Radiation detector are used to

Question # 15

U-238 present in the natural uranium is about:

Question # 16

Three quarks make:

Question # 17

The total charge of any nucleus is given as

Question # 18

The isotope/s of hydrogen is /are:

Question # 19

The rate of decay of radioactive substance

Question # 20

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

Question # 21

Electrons are

Question # 22

Radioactivity

Question # 23

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

Question # 24

According to Rutherford atomic model, the positive charge in an atom

Question # 25

The unit of decay constant is

Question # 26

Which of these is not a radiation detector

Question # 27

Pair production take place when energy ofγ-rays photon is

Question # 28

Phenomenon of radioactivity is due to disintegration of

Question # 29

The unit of decay constant is:

Question # 30

Which are not the elementary particles?

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
2 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
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 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
5 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
6 The half life of uranium-238 is
A. 6.2 x 109years
B. 4.5 x 109days
C. 4.5 x 109years
D. 1.3 x 106years
7 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
8 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
9 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
10 The energy acquired by a mass of 1g moving with the speed of light is
A. 3 x 108J
B. 9 x 1013J
C. 3 x 1013J
D. 9 x 1016J

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