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Online Tests
ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
According to Rutherford atomic model, the positive charge in an atom
Choose an answer
is concentrated at its centre
is in the form of positive electron at same distance from its centre
is spread uniformly through its volume
none of these
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Question # 2
Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
Choose an answer
50
100
150
200
250
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Question # 3
A curie represents a very strong source of
Choose an answer
α-particle
β-particle
γ-particle
none of these
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Question # 4
γ-rays are
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electrostatic waves
electromagnetic waves
heavy particles
longitudinal waves
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Question # 5
The rate of decay of radioactive substance
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is constant
decrease exponentially with time
varies inversely as time
decreases linearly with time
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Question # 6
The nucleus left after the emission of some radiation is called:
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Parent nucleus
Daughter necleus
Mother necleus
Any of these
None of these
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Question # 7
If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
Choose an answer
-4
4
2
1
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Question # 8
The penetration power of
β-particle is
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zero
less than
α-particle
equal to
α-particle
greater than
α-particle
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Question # 9
Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
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deuterium
protium
tritium
none of these
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Question # 10
Which of these is not a radiation detector
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Wilson cloud chamber
cyclotron acceleration
Geiger Miller counter
solid state detector
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Question # 11
The time required for a radioactive material to decrease in active by one half is called
Choose an answer
half time
half life
disintegration time
mean life
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Question # 12
Neutrons are
Choose an answer
positive charge
negatively charged
massless
neutral
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Question # 13
1 amu is equal to.
Choose an answer
1.66 x 10
-24
kg
1.66 x 10
-19
kg
1.66 x 10
-24
kg
1.66 x 10
-27
kg
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Question # 14
Pair production take place when energy of
γ-rays photon is
Choose an answer
equal to 1.02 Mev-
greater than 1.02 Mev
less than 1.02 Mev
none of these
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Question # 15
Different radioactive material have
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same half lives
different half lives
same mean lives
same total lives
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Question # 16
Marie curie and Pierre curie discovered:
Choose an answer
Uranium
Polonium
Radium
Both (A) and (C)
Plutonium
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Question # 17
Examples of moderators used in a fission reactor is/are:
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Water
Heavy water
Carbon
Hydrocarbon
All of these
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Question # 18
When certain nucleus emits anα particle, its mass number:
Choose an answer
Increases by one
Decreases by one
Remain same
Decreases by four
None of these
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Question # 19
Neutron was suggested to be in the nucleus by:
Choose an answer
Rutherford in 1920
Bohar in 1913
Dirac in 1928
Anderson in 1932
None of these
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Question # 20
Referring to the above figure, we can say that of all the elements, the most stable element is
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Phosphours
Iron
uranium
Lithium
Bismuth
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Question # 21
In radio-active decay, the original element which disintegrate to another element is called
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element
daughter element
parent element
none of these
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Question # 22
The number of isotopes of hydrogen are
Choose an answer
2
1
3
4
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Question # 23
Mass of proton is
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1.67 x 10
-27
kg
1.67 x 10
-31
kg
1.66 x 10
-34
kg
1.67 x 10
-17
kg
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Question # 24
Which of the following material has longer half life
Choose an answer
radium
polonium
radium
uranium
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Question # 25
For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
Choose an answer
A - Z
A
Z
A + Z
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Question # 26
The half lie of radium-226 is
Choose an answer
238 years
4.5 x 10
9
days
1620 years
332 years
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Question # 27
The number of protons inside a nucleus is called
Choose an answer
mass number
atomic weight
atomic number
none of these
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Question # 28
The chemical properties of all the isotopes of an elements are
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same
different
slightly different
none of these
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Question # 29
Proton was discovered by Rutherford in
Choose an answer
1915
1906
1910
1920
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Question # 30
The number if neutrons in the nucleus of
92
U
235
are
Choose an answer
Infinite
92
235
143
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Question # 31
In his experiment on nuclear reactions, Rutherford bombardedα particles on:
Choose an answer
Nitrogen
Hydrogen
Lead
Oxygen
Krypton
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