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 neutron is

Question # 2

1 amu is equal to.

Question # 3

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

Question # 4

Alfa particles are

Question # 5

The number of protons inside a nucleus is called

Question # 6

The half life of uranium-238 is

Question # 7

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

Question # 8

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

Question # 9

A curie represents a very strong source of

Question # 10

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

Question # 11

An alpha particle has a charge of

Question # 12

The half life of radioactive substances depends upon

Question # 13

The chemical properties of an element depends upon the number of

Question # 14

U-238 present in the natural uranium is about:

Question # 15

The diameter of an atom is of the order

Question # 16

A pair of quark and antiquark makes a:

Question # 17

A mass spectrograph sort out

Question # 18

The chemical properties of all the isotopes of an elements are

Question # 19

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

Question # 20

Mass of proton is of order of

Question # 21

The penetration power ofβ-particle is

Question # 22

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

Question # 23

Pair production take place when energy ofγ-rays photon is

Question # 24

Gamma rays consist of steam of

Question # 25

γ-rays are

Question # 26

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

Question # 27

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

Question # 28

The time required for a radioactive material to decrease in active by one half is called

Question # 29

Beta particles are

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
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 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
4 Binding energy per nucleus is
A. greater for heavy nucleus
B. least for heavy nucleus
C. greatest for light nuclei
D. decreases for medium weight niclei
5 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
6 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
7 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
8 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
9 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
10 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes

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