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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
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 # 2
A pair of quark and antiquark makes a:
Choose an answer
Meson
Baryon
Proton
Neutron
None of these
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Question # 3
The energy acquired by a mass of 1g moving with the speed of light is
Choose an answer
3 x 10
8
J
9 x 10
13
J
3 x 10
13
J
9 x 10
16
J
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Question # 4
For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
Choose an answer
A - Z
A + Z
Z
A
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Question # 5
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 # 6
The figure 1.007276μ shows the mass of an:
Choose an answer
Atom
Positron
Electron
Neutron
Proton
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Question # 7
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 # 8
Marie curie and Pierre curie discovered:
Choose an answer
Uranium
Polonium
Radium
Both (A) and (C)
Plutonium
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Question # 9
Neutron was discovered in
Choose an answer
1915
1920
1925
1932
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Question # 10
The number of all the protons and neutrons in a nucleus is known as
Choose an answer
atomic number
mass number
charge number
none of these
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Question # 11
When a nucleus emits an alpha particles, its charge number decreases by
Choose an answer
3
2
6
5
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Question # 12
U-238 present in the natural uranium is about:
Choose an answer
59%
0.007%
99%
39%
19%
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Question # 13
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 # 14
Nucleon means:
Choose an answer
Only electrons
Only neutrons
Only protons
Both (A ) and (C)
Both (B) and (C)
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Question # 15
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 # 16
Phenomenon of radioactivity is due to disintegration of
Choose an answer
nucleus
neutron
proton
molecule
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