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

00:00
Question # 1

Nucleon means:

Question # 2

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

Question # 3

Which are not the elementary particles?

Question # 4

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Question # 5

Pair production take place when energy ofγ-rays photon is

Question # 6

Marie curie and Pierre curie discovered:

Question # 7

U-238 present in the natural uranium is about:

Question # 8

Curie is a unit of

Question # 9

The chemical behaviour of an atom is determined by

Question # 10

The rate of decay of radioactive substance

Question # 11

The diameter of an atom is of the order

Question # 12

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

Question # 13

Radium was discovered by:

Question # 14

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

Question # 15

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

Question # 16

After alpha decay the atomic number of the atom

Question # 17

An alpha particle has a charge of

Question # 18

The half life of radioactive substances depends upon

Question # 19

The unit of decay constant is:

Question # 20

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

Question # 21

The chemical properties of all the isotopes of an elements are

Question # 22

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

Question # 23

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

Question # 24

In 1932 Chadwick discovered

Question # 25

Mass of proton is

Question # 26

Radioactivity is

Question # 27

Nucleus of a hydrogen atom may contain:

Question # 28

Which of the following material has longer half life

Question # 29

There is present in paraffin a large amount of:

Question # 30

Radioactivity

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
2 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
3 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
4 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
5 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
6 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
7 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
8 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
9 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
10 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

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