ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

Which of the following material has smaller has life

Question # 2

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

Question # 3

Radioactivity was discovered by

Question # 4

Neon gas have three isotopes whose atomic numbers are

Question # 5

The range of particle depends upon the factor

Question # 6

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 7

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

Question # 8

The nucleus/nuclei of hydrogen is/are:

Question # 9

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 10

The chemical properties of an element depends upon the number of

Question # 11

The number of isotopes of hydrogen are

Question # 12

An alpha particle has a charge of

Question # 13

Which of these is not a radiation detector

Question # 14

In wilson cloud chamber, the air becomes saturated with:

Question # 15

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 16

The penetration power ofβ-particle is

Question # 17

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

Question # 18

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

Question # 19

Mass of proton is

Question # 20

Mass of proton is of order of

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

The half life of uranium-238 is

Question # 25

The number of all the protons and neutrons in a nucleus is known as

Question # 26

A curie represents a very strong source of

Question # 27

Radium was discovered by:

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
2 The nucleus left after the emission of some radiation is called:
A. Parent nucleus
B. Daughter necleus
C. Mother necleus
D. Any of these
3 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
4 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
5 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
6 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these
7 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200
8 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
9 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
10 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4

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