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

Mass of proton is of order of

Question # 2

In wilson cloud chamber, the air becomes saturated with:

Question # 3

Neutrons are

Question # 4

The unit of decay constant is:

Question # 5

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

Question # 6

Neutron was suggested to be in the nucleus by:

Question # 7

Phenomenon of radioactivity is due to disintegration of

Question # 8

The number of protons inside a nucleus is called

Question # 9

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

Question # 10

The range of particle depends upon the factor

Question # 11

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

Question # 12

Electrons are

Question # 13

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

Question # 14

Gamma rays consist of steam of

Question # 15

The range ofβ-particle in air is greater than that ofα-particle by

Question # 16

Rate of decay is actually described by.

Question # 17

Curie is a unit of

Question # 18

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

Question # 19

The most abundant isotope of neon is

Question # 20

Nucleus of a hydrogen atom may contain:

Question # 21

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 22

Which of the following material has smaller has life

Question # 23

Binding energy per nucleus is

Question # 24

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 25

Alfa particles are

Question # 26

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

Question # 27

Beta particles are

Question # 28

Nucleus consists of

Question # 29

Neutron was disvovered by:

Question # 30

The number if neutrons in the nucleus of 92U235are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
2 Mass of proton is
A. 1.67 x 10-27kg
B. 1.67 x 10-31kg
C. 1.66 x 10-34kg
D. 1.67 x 10-17kg
3 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
4 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
5 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
6 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
7 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral
8 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
9 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
10 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity

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