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PPSC Physics Chapter 7 Modern Physics MCQs With Answers
Question # 1
Compton scattering experiment seemed to indicate that radiation had
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Wave nature
Particle nature
Wave particle nature
X-rays nature
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Question # 2
Which of the following is not a mode of radioactive decay
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Nuclear fusion
Alpha decay
Electron capture
Positron emission
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Question # 3
The division and germier experiment relates to
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Diffusion
interference
Polarization
Electron diffraction
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Question # 4
In which of the following studies x-rays are not helpful.
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Crystal structure
Crystal surface
Crystal symmetry
Crystal atoms
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Question # 5
In CE amplifier phased reversal occurs when the output voltage is taken between
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Base and collector
Base and emitter
Collector and emitter
None of the terminals
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Question # 6
A transistor consists of.
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One p-n junction
Two p-n junctions
Three p-n junctions
Four p-n junction
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Question # 7
The strength of photo electric current depends upon.
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Intensity of incident light
Frequency of incident light
Angle of incident light
Distance between anode and cathode
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Question # 8
Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.
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20 minutes
40 minutes
80 minutes
120 minutes
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Question # 9
Which of the following is required for maintaining sustained chain reaction.
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Neutrons
Protons
Electrons
Photons
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Question # 10
An emitter follower has
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High input impedance and high output impedance
High input impedance and low output impedance
Low input impedance and low output impedance
Low input impedance and high output impedance
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Question # 11
Matter waves
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Are electromagnetic in nature
Travel with the speed of light
Can be diffracted
Are longitudinal waves
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Question # 12
At what speed the mass of a body will be doubled.
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0.67 C
0.77 C
0.87 C
0.97 C
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Question # 13
Which of the following are electromagnetic waves.
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Alpha particles
Beta particles
Gama rays
Water waves
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Question # 14
X-rays spectrum may be
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Continuous spectrum
Discontinuous spectrum
Line spectrum
Continuous and line spectrum
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Question # 15
Which of the following particles leave no trail in a cloud chamber.
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Electrons
Protons
Alpha particles
Neutrons
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Question # 16
The half life of a radioactive substance depend on.
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Pressure
Temperature
Amount of substance
No external influences
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Question # 17
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 # 18
Both xenon and cesium each have
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24 isotopes
28 isotopes
32 isotopes
36 isotopes
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Question # 19
The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.
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Directly proportional to n
Directly proportional to n2
Inversely proportional to n
Inversely proportional to n2
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Question # 20
In a Nuclear reactor which material is often used as modeerator.
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Water
Graphite
Uranium
Water and graphite
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Question # 21
The bunding energy per nucleon for iron is.
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zero
Maximum
Negative
Minimum
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