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

Charge on neutron is

Question # 2

A pair of quark and antiquark makes a:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The number of protons inside a nucleus is called

Question # 7

Mass of proton is

Question # 8

The half life of uranium-238 is

Question # 9

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

Question # 10

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

Question # 11

In wilson cloud chamber, the air becomes saturated with:

Question # 12

Nucleon means:

Question # 13

The chemical properties of an element depends upon the number of

Question # 14

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

Question # 15

Rate of decay is actually described by.

Question # 16

The total charge of any nucleus is given as

Question # 17

The reciprocal of decay constant λ of a radioactive material is:

Question # 18

Phenomenon of radioactivity is due to disintegration of

Question # 19

The emission of radiations take place in elements, having charge number greater than

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

The penetration power ofβ-particle is

Question # 24

A mass spectrograph sort out

Question # 25

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

Question # 26

γ-rays are

Question # 27

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

Question # 28

An alpha particle has a charge of

Question # 29

Radioactivity is

Question # 30

U-238 present in the natural uranium is about:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
2 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1
3 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
4 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
5 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
6 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
7 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
8 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above
9 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
10 Rutherford performed an experiment on nuclear reactions in:
A. 1718 A.D
B. 1818 A.D
C. 1918 A.D
D. 2001 A.D.

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