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

The nucleus/nuclei of hydrogen is/are:

Question # 2

The half life of radioactive substances depends upon

Question # 3

The diameter of an atom is of the order

Question # 4

Radioactivity was discovered by:

Question # 5

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

Question # 6

Neutron was discovered by

Question # 7

The number of isotopes of hydrogen are

Question # 8

Curie is a unit of

Question # 9

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

Question # 10

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

Question # 11

How many isotopes of helium are present?

Question # 12

Nucleus consists of

Question # 13

Neutron was discovered in

Question # 14

Different radioactive material have

Question # 15

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

Question # 16

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 17

Binding energy per nucleus is

Question # 18

A pair of quark and antiquark makes a:

Question # 19

Which are not the elementary particles?

Question # 20

Mass of neutron is

Question # 21

Fraction of the decaying atoms per unit time is called

Question # 22

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 23

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

Question # 24

Which of the following material has longer half life

Question # 25

When certain nucleus emits anα particle, its mass number:

Question # 26

Examples of moderators used in a fission reactor is/are:

Question # 27

A particle having the mass of electron and charge of a proton is called a

Question # 28

Rate of decay is actually described by.

Question # 29

The rate of decay of radioactive substance

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
2 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
3 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
4 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
5 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
6 Nucleus of a hydrogen atom may contain:
A. One neutron only
B. Two protons and one neutron
C. Two protons and two neutrons
D. Aany of above
7 A particle having the mass of electron and charge of a proton is called a
A. photon
B. position
C. antiproton
D. antineutrino
8 The amount of energy equivalent to 1 a.m.u is
A. 9.315 Mev
B. 93.15 Mev
C. 931.5 Mev
D. 2.22 Mev
9 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
10 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'

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