ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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

Nucleus consists of

Question # 2

The half life of radioactive substances depends upon

Question # 3

The chemical properties of an element depends upon the number of

Question # 4

An alpha particle has a charge of

Question # 5

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 6

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 7

In wilson cloud chamber, the air becomes saturated with:

Question # 8

A mass spectrograph sort out

Question # 9

The figure 1.007276μ shows the mass of an:

Question # 10

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

Question # 11

Nucleon means:

Question # 12

1 amu is equal to.

Question # 13

U-238 present in the natural uranium is about:

Question # 14

The chemical properties of all the isotopes of an elements are

Question # 15

Charge on neutron is

Question # 16

Phenomenon of radioactivity is due to disintegration of

Question # 17

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 18

Which of these is not a radiation detector

Question # 19

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

Question # 20

Neon gas have three isotopes whose atomic numbers are

Question # 21

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 22

Different radioactive material have

Question # 23

The counter, which also provides the power to the G.M. tube is called:

Question # 24

The number of isotopes of hydrogen are

Question # 25

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

Question # 26

The half lie of radium-226 is

Question # 27

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

Question # 28

Rate of decay is actually described by.

Question # 29

1 amu is equal to

Question # 30

How many isotopes of helium are present?

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
2 Neon gas have three isotopes whose atomic numbers are
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
3 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
4 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
5 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
6 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
7 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
8 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
9 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
10 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four

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