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

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Question # 1

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

Question # 2

In wilson cloud chamber, the air becomes saturated with:

Question # 3

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 4

The half life of radioactive substances depends upon

Question # 5

The number of protons inside a nucleus is called

Question # 6

Which of the following material has longer half life

Question # 7

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

Question # 8

The unit of decay constant is:

Question # 9

γ-rays are

Question # 10

Phenomenon of radioactivity is due to disintegration of

Question # 11

The half lie of radium-226 is

Question # 12

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

Question # 13

The chemical properties of all the isotopes of an elements are

Question # 14

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

Question # 15

Neutron was suggested to be in the nucleus by:

Question # 16

β-particles are easily deflected by collisions than heavy

Question # 17

Marie curie and Pierre curie discovered:

Question # 18

The half life of uranium-238 is

Question # 19

A curie represents a very strong source of

Question # 20

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

Question # 21

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

Question # 22

After alpha decay the atomic number of the atom

Question # 23

Radioactivity was discovered by:

Question # 24

Radioactivity is

Question # 25

Binding energy per nucleus is

Question # 26

The chemical behaviour of an atom is determined by

Question # 27

Which of these is not a radiation detector

Question # 28

Neutrons are

Question # 29

The rate of decay of a radioactive substance

Question # 30

The nucleus/nuclei of hydrogen is/are:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
2 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons
3 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
A. nuclear fission
B. nuclear fusion
C. man defect
D. radioactivity
4 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
5 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
6 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
7 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
8 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
9 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
10 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2

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