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PPSC Physics Chapter 7 Modern Physics MCQs With Answers
Question # 1
The working of cloud chamber is based in the presence of.
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Super heated vapours
Liquid
Super saturated vapors
Unsaturated vapours
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Question # 2
The average energy released per fission of U is about
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200 eV
2 keV
2 MeV
200 MeV
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Question # 3
A complete amplifier circuit made on a silicon chip and enclosed in a small capsule is
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Inductor
Metal detector
Diode
Operational amplifier
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Question # 4
The SI unit of absorbed dose in.
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Bel
Weber
Rem
Grey
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Question # 5
The Rutherford atom according to classical theory is
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Stable
Unstable
Partially stable
Quantized
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Question # 6
The Inner electrons in heavy atoms can be disturbed and dislodged by.
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X rays
Alpha particle
Beta particles
gama particles
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Question # 7
Which one the following is not a component of a Bipolar junction Transistor
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Base
Emitter
Collector
Grid
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Question # 8
Nuclear force exists between
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Proton proton
Neutron -neutron
neutron -proton
All of these
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Question # 9
The radius of second orbit of hydrogen atom is
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0.071 A
0.142 A
4.752 A
9.5298 A
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Question # 10
Two electrons approach each other their relative velocity will be.
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Zero
c
c/2
Infinity
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Question # 11
The continuous x rays spectrum is obtained due to
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Deceleration of impact electrons
Breaking potential
Excitation potential
Ionization potential
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Question # 12
Sub atomic particles which experience strong nuclear force are.
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Leptons
Hadrons
Mesons
Quarks
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Question # 13
There are how many types of forces or interactions.
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Two
Three
Four
Five
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Question # 14
Which of the following circuits is used as local oscillator in radio receivers.
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AF oscillator
Phase Local Loop
RF oscillator
All of the above
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Question # 15
At room temperature the potential difference between the two sides of depletion region for silicon is of the order of.
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0.3 v
0.5 V
0.7 V
0.9 V
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Question # 16
When an object moves with a very high speed the length in the direction of motion.
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Contracts
Expands
Remains the same
Becomes infinity
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Question # 17
In which of the following controlled nuclear chain reaction is used to liberate energy.
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Nuclear bomb
Atomic bomb
Hydrogen bomb
Nuclear reactor
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Question # 18
Which BJT configurations used for signal inversion.
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CE
CC
CB
BE
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Question # 19
The half life of uranium -238 is
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1620 years
4.5 x 10
9
years
3-8 days
23.5 minutes
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Question # 20
Besides U
235
what else is needed for making as atomic bomb.
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Electons
Protons
Neutrons
Photons
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Question # 21
Which one of the following is a neutron absorber
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Pb
Cd
Cu
Ag
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