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The MCQs below are drawn from the Physics subject category.
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1331
Two identical light sources S1 and S2 emit light of the same wavelength. These light rays will exhibit interference if
A. their light intensities change randomly
B. the light intensities remain constant
C. their phase difference remains constant
D. their phases are distributed randomly
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Explanation
Interference requires coherence, which means the relative phase must remain constant so stable interference fringes form.
1332
Two waves each of frequency 540 hertz travel at a speed of 330 m/s. If the sources are in phase, in the beginning, the phase difference of the waves at a point 4 m from one source and 4.4 m from the other is
A. 59°
B. 236°
C. 177°
D. 118°
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Explanation
Wavelength λ = 330/540 ≈ 0.611 m; path difference 0.4 m gives phase difference 2π·0.4/0.611 ≈ 4.11 rad ≈ 235.6°, i.e. ≈ 236°.
1333
Interference occurs in which of the following waves?
A. Longitudinal
B. Transverse
C. Electromagnetic
D. All of these
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Explanation
Interference is a general wave phenomenon and can occur for longitudinal, transverse and electromagnetic waves.
1334
The bending of beam of light around corners of obstacles is called
A. reflection
B. refraction
C. diffraction
D. interference
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Explanation
Diffraction is the phenomenon where waves spread and bend around obstacles and apertures.
1335
Michelson's interferometer can be used to find
A. wavelength of light
B. velocity of sound
C. velocity of light
D. wavelength of sound
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Explanation
A Michelson interferometer is commonly used to measure wavelengths and small changes in optical path, so it can determine the wavelength of light.
1336
The condition for observing Fraunhofer diffraction from a single slit is that the light wavefronts incident on the slit should be:
A. cylindrical.
B. elliptical.
C. spherical.
D. planar.
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Explanation
Fraunhofer (far-field) diffraction assumes plane (planar) incident wavefronts so that the diffraction pattern is observed at essentially infinite distance or with a lens.
1337
When the prongs of a tuning fork is filed, its frequency:
A. Increases
B. Decreases
C. Remains unchanged
D. None of these
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Explanation
Filing removes mass from the prongs, increasing their natural frequency.
1338
Intensity of the dark bands in interference pattern becomes zero, when two waves
A. are of the same frequency
B. are of the same amplitude
C. travel in opposite direction
D. of light are monochromatic
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Explanation
For complete destructive interference (intensity zero), the two waves must have equal amplitudes and be π out of phase.
1339
Diffraction is the property according to which light waves
A. produce chemical effects
B. bend round the corners
C. change their direction on entering a different medium
D. bend towards the centre
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Explanation
Diffraction is the bending of waves around obstacles or through apertures, allowing them to bend around corners.
1340
If biprism experiment is performed in water instead of air then:
A. Fringe width will decrease
B. Fringe width will increase
C. No fringe pattern will be formed
D. Fringe width will remain unchanged
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Explanation
Fringe width ∝ wavelength in the medium, and wavelength in water is reduced (λ = λ0/n), so the fringe width decreases.
