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ECAT Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
Nucleus of a hydrogen atom may contain:
Choose an answer
One neutron only
Two protons and one neutron
Two protons and two neutrons
Aany of above
One proton only
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Question # 2
When certain nucleus emits aβ-particles, is mass number:
Choose an answer
Remain same
Increases by one
Decreases by one
Decreases by four
None of these
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Question # 3
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 # 4
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 # 5
Nuclei that have the same charge number but different mass number are called
Choose an answer
isotones
isomers
isotopes
isobars
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Question # 6
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 # 7
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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Question # 8
Three quarks make:
Choose an answer
An electron
A meson
A baryon
A photon
None of these
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Question # 9
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 # 10
Electrons are
Choose an answer
positive charged
negatively charged
massless
neutral
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Question # 11
The half life of uranium-238 is
Choose an answer
6.2 x 10
9
years
4.5 x 10
9
days
4.5 x 10
9
years
1.3 x 10
6
years
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Question # 12
1 amu is equal to
Choose an answer
1.66 x 10
-24
kg
1.66 x 10
-19
kg
1.66 x 10
-34
kg
1.66 x 10
-27
kg
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Question # 13
Neutron was disvovered by:
Choose an answer
Rutherford in 1920
Chadwick in 1922
Bohr in 1913
Compton in 1927
None of these
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Question # 14
An alpha particle has a charge of
Choose an answer
+2e
-2e
-e
+3e
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Question # 15
Rate of decay is actually described by.
Choose an answer
Half line
Decay constant
Mean life
Total life
None of these
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Question # 16
How many isotopes of helium are present?
Choose an answer
1
2
3
4
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