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Physics FSC Part 2 Chapter 21 Online MCQ's Test MCQs With Answers
Question # 1
One joule of energy absorbed per kilogram of a body is
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Roentgen
Grey
Rem
Curie
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Question # 2
The number of protons in any atom are always equal to the number of
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Neutrons
Electrons
Positrons
Mesoris
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Question # 3
When nitrogen is bombarded by alpha particles nitrogen nucleus changes into
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Oxygen
Carbon
Barium
Helium
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Question # 4
The reciprocal of decay construct lamda of a radioactive element is.
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Half life
Mean life
Curie
total life
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Question # 5
What is difference is isotopes
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Number of protons
Number of neutrons
Number of electrons
Charge number
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Question # 6
Those elements whose charge number z is greater then __________ are unstable:
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80
79
82
83
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Question # 7
Unit of decay constant
λ is:
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ms
m
-1
m
S
-1
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Question # 8
The number of neutrons in Li are
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2
3
4
7
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Question # 9
Absorbed Dose 'D' is defined as
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m/E
E/C
C/m
E/m
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Question # 10
Alpha particle carries a charge.
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-e
+2e
-2e
No charge
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Question # 11
The potential difference between the top and bottom of a cloud chamber is of the order of
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290 v
400 v
1 kv
None of above
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Question # 12
X -rays are similar in nature to.
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Gama rays
Beta rays
Alpha rays
Cathode rays
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Question # 13
The dead time of G.M tube is.
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10
-1
sec
10
-6
sec
10
-4
sec
10
-8
sec
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Question # 14
Which pair belongs to hadrons.
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Protons and Neutrons
Neutrons and electrons
Photons and electrons
positrons and electrons
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Question # 15
Both xenon and caesium each have:
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41 isotopes
36 isotopes
43 isotopes
33 isotopes
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Question # 16
Two up quarks and one down quarks makes a
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Proton
Newton
Photon
Meson
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Question # 17
The charge number of Ba is.
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197
141
56
85
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Question # 18
The most abundant isotope of neon is:
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Neon 21
Neon 20
Neon 22
None of above
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