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

Gamma rays consist of steam of

Question # 2

How many isotopes of helium are present?

Question # 3

Electrons are

Question # 4

Radium was discovered by:

Question # 5

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

Question # 6

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

Question # 7

An alpha particle has a charge of

Question # 8

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

Question # 9

Which of the following material has longer half life

Question # 10

In 1932 Chadwick discovered

Question # 11

Charge on neutron is

Question # 12

The diameter of an atom is of the order

Question # 13

The chemical behaviour of an atom is determined by

Question # 14

Fraction of the decaying atoms per unit time is called

Question # 15

A mass spectrograph sort out

Question # 16

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

Question # 17

Radioactivity is

Question # 18

The half life of uranium-238 is

Question # 19

1 amu is equal to

Question # 20

Mass of neutron is

Question # 21

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

Question # 22

Radioactivity

Question # 23

Rate of decay is actually described by.

Question # 24

Neon gas have three isotopes whose atomic numbers are

Question # 25

Charge on proton is

Question # 26

Nucleus consists of

Question # 27

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

Question # 28

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

Question # 29

In radio-active decay, the original element which disintegrate to another element is called

Question # 30

In wilson cloud chamber, the air becomes saturated with:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
2 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
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 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
5 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
6 The energy acquired by a mass of 1g moving with the speed of light is
A. 3 x 108J
B. 9 x 1013J
C. 3 x 1013J
D. 9 x 1016J
7 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
8 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg
9 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
10 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these

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