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Online Tests
ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
γ-rays are
Choose an answer
electrostatic waves
electromagnetic waves
heavy particles
longitudinal waves
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Question # 2
Gamma rays consist of steam of
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electron
proton
photons
all of these
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Question # 3
When radioactive nucleus emits a
β-particle, the proton-neutron ratio
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decrease
increase
same
none of these
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Question # 4
Rate of decay is actually described by.
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Half line
Decay constant
Mean life
Total life
None of these
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Question # 5
Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called
Choose an answer
deuteron
deterium
protium
tritium
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Question # 6
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 # 7
An alpha particle has a charge of
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+2e
-2e
-e
+3e
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Question # 8
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 # 9
A mass spectrograph sort out
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molecules
atoms
elements
isotopes
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Question # 10
Proton was discovered by Rutherford in
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1915
1906
1910
1920
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Question # 11
Mass of neutron is
Choose an answer
1.67 x 10
-31
kg
1.67 x 10
-27
kg
9.1 x 10
-31
kg
1.67 x 10
-
19kg
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Question # 12
Charge on proton is
Choose an answer
1.59 x 10
-9
C
1.59 x 10
-7
C
-1.59 x 10
-19
C
1.59 x 10
-19
C
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Question # 13
Which of the following material has smaller has life
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uranium
polonium
radium
radian
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Question # 14
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 # 15
The most abundant isotope of neon is
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neon-20
neon-21
neon-22
neon-23
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Question # 16
For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
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A - Z
A + Z
Z
A
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Question # 17
For Protium, the mass defect is:
Choose an answer
Infinite
Zero
Very large
A few grams
None of these
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Question # 18
Mass of proton is of order of
Choose an answer
10
-31
gm
10
-27
kg
10
-24
gm
10
+27
kg
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Question # 19
The diameter of an atom is of the order
Choose an answer
10
-125
m
10
-11
m
10
-10
m
10
-9
m
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Question # 20
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 # 21
Electrons are
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positive charged
negatively charged
massless
neutral
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Question # 22
Neutron was discovered in
Choose an answer
1915
1920
1925
1932
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Question # 23
Mass of proton is
Choose an answer
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
The number if neutrons in the nucleus of
92
U
235
are
Choose an answer
Infinite
92
235
143
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Question # 25
The rate of decay of radioactive substance
Choose an answer
is constant
decrease exponentially with time
varies inversely as time
decreases linearly with time
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Question # 26
Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
Choose an answer
deuterium
protium
tritium
none of these
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Question # 27
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 # 28
After alpha decay the atomic number of the atom
Choose an answer
increase by four
decreases by two
increases by two
decrease by four
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Question # 29
The chemical properties of an element depends upon the number of
Choose an answer
electron
position
photons
neutrons
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Question # 30
The range of
β-particle in air is greater than that of
α-particle by
Choose an answer
1000 times
100 times
15 times
10 times
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Question # 31
Neon gas have three isotopes whose atomic numbers are
Choose an answer
20, 24 , 23
20, 21 , 22
20, 19 , 21
none of these
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