Modern Physics Mcqs
This collections of Multiple choice questions and answers focuses on study of Modern Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Modern Physics comprehensively.
32. The linear momentum of an X-ray photon of wavelength 0.1A is
6.625x1023N-s
66.25x1023N-s
662.5x1023N-s
Data is insufficient
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33. The name of the photon for quantum of light was proposed by
Ampere
Plank
Thomson
Einstein
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34. The relativistic energy E is equivalent to relativistic mass given by
Ec2
E/c2
E/c
C2/E
35. The uncertainty in momentum & position is due to its
Property of matter and radiation.
Two dimensional motion.
Emission of certain wavelength
Very high velocity.
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36. The velocity of a particle of mass m of de-Broglie wavelength ? is
D
37. Tick the correct statement
The flight path of a vertically falling body appears straight to the stationary observer
The flight path of vertically falling body appears parabolic to an observer in uniform relative motion
All states of rest and motion are relative and there is no such thing as absolute motion
All the above
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38. Tick the right statement.
No photo electronic emission takes place if the frequency of radiation however intense it may be is less than a certain critical value called threshold frequency
Threshold frequency depends upon the nature of the metal surface
Maximum energy of a photoelectron is a function of frequency rather than intensity of radiation
All of the above
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39. Which one of the following has the largest energy content?
103 photons of wavelength 2pm (?-rays).
102 photons of wavelength 1nm (x-rays).
106 photons of wavelength 50?m (infrared).
106 photons of wavelength 200nm (UV).
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40. Which one of the following radiations has the strongest photon?
T.V waves
Micro waves
X-rays
?-rays