Physical Optics — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#57 The speed of light in a medium of refractive index \( \mu \) is given by:
A) \( \mu c \)
B) \( \frac{c}{\mu} \)
C) \( c + \mu \)
D) \( c - \mu \)
#58 In a transverse wave, the direction of vibration of the particles is:
A) Parallel to the direction of wave propagation
B) Perpendicular to the direction of wave propagation
C) At 45° to the direction of wave propagation
D) Random
#59 The time taken for one complete oscillation of a wave is called its:
A) Frequency
B) Wavelength
C) Period
D) Amplitude
#60 The number of oscillations per second is called the:
A) Wavelength
B) Period
C) Frequency
D) Speed
#61 For a given medium, the frequency of a wave:
A) Changes with wavelength
B) Is independent of wavelength
C) Is always constant
D) Is zero
#62 The law of reflection can be derived from:
A) Newton's laws
B) Huygens' principle
C) Einstein's postulates
D) Maxwell's equations
#63 In a standing wave, the points that have zero amplitude are called:
A) Antinodes
B) Nodes
C) Crests
D) Troughs
#64 The Doppler effect is the change in the observed frequency of a wave due to the:
A) Relative motion between the source and the observer
B) Change in the medium
C) Change in temperature
D) Interference of waves
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