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.

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31.
The existence of Ether wind was experimentally rejected by

Equal to its rest mass

Double of its rest mass

Infinite

Zero

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

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.

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

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

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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