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

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

Question # 2

The energy is found from Einstein's mass energy relation is called

Question # 3

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

Question # 4

Neutron was discovered by

Question # 5

The half life of radioactive substances depends upon

Question # 6

The nucleus left after the emission of some radiation is called:

Question # 7

The amount of energy equivalent to 1 a.m.u is

Question # 8

Alfa particles are

Question # 9

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

Question # 10

The total charge of any nucleus is given as

Question # 11

Neutrons are

Question # 12

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

Question # 13

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

Question # 14

Rutherford performed an experiment on nuclear reactions in:

Question # 15

Radiation detector are used to

Question # 16

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

Question # 17

Three quarks make:

Question # 18

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

Question # 19

Neon gas have three isotopes whose atomic numbers are

Question # 20

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

Question # 21

Marie curie and Pierre curie discovered:

Question # 22

The number if neutrons in the nucleus of 92U235are

Question # 23

The rate of decay of radioactive substance

Question # 24

Fraction of the decaying atoms per unit time is called

Question # 25

γ-rays are

Question # 26

The rate of decay of a radioactive substance

Question # 27

A curie represents a very strong source of

Question # 28

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

Question # 29

Which are not the elementary particles?

Question # 30

Mass of neutron is

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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 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
3 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
4 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
5 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
6 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
7 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
8 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
9 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
10 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23

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