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PPSC Physics Chapter 7 Modern Physics MCQs With Answers
Question # 1
The most convenient unit for energy at the atomic level is.
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Joule
Watt second
Newton metre
Electron volt
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Question # 2
x-rays cannot produce
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Photoelectron
Compton electron
Electron positron pair
All of these
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Question # 3
The number of electrons in U nucleus are.
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92
235
zero
143
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Question # 4
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 # 5
The ionization potential of hydrogen atom is.
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10.2 V
13.6 V
12.97 V
27.2 V
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Question # 6
Which of the following has the highest relative biological effectiveness or the quality factor.
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X rays and Gama rays
Electrons
Photons
Alpha particles
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Question # 7
Which particle are not emitted by a radioactive substance.
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Alpha particles
Beta particles
Gama particles
Neutrons
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Question # 8
In Compton's effect it was considered that X-rays consist of
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Electrons
Holes
Neutrons
Protons
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Question # 9
Which of the following are particle accelerators.
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Cyclotrons
Synchrotrons
Linear accelerators
All of the above
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Question # 10
If an object moves with velocity of light the apparent length of the object moving the direction of motion becomes.
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Larger
Smaller
Zero
Infinity
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Question # 11
Push pull amplifiers employ
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One transistor
Two transistors
Three transistors
Four transistors
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Question # 12
The binding energy to pull the deuterium H apart into a proton and a neutron is equal to.
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1.22 MeV
2.22 MeV
3.22 Mev
4.22 MeV
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Question # 13
The most readily fissionable isotope of uranium has atomic mass of
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234
235
236
238
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Question # 14
A logic circuit with one input and one output that inverts the input signal at the output is.
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AND gate
NOT gate
OR gate
NOR gate
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Question # 15
Marie Curie and Pierre Curie discovered two new radioactive elements which are.
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Uranium and radkum
Platinum and radium
Polonium and radium
Crypton and radon
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Question # 16
The process of pair production will take place if the energy of photon is greater than.
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0.21 MeV
0.51 MeV
1.51 MeV
1.21 MeV
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Question # 17
An Alpha particle is the same as
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A helium nucleus
A high speed electron
A hydrogen nucleus
Electromagnetic radiation of short wavelength
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Question # 18
The ionization energy for hydrogen atom is
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-11.6 eV
-12.6 eV
-13.6 eV
-19.6 eV
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Question # 19
The total energy of an electron in an orbit around the nucleus is.
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Zero
Unity
Infinity
Negative
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Question # 20
A deuteron is
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A type of proton
A proton neutron bounded to gather.
A type of beta particle
A type of neutron
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Question # 21
X-ray are
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Streams of negatively charted particles.
Electromagnetic wave
Streams of positively charged particles
Visible light
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