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1st Year Physics Chapter Nine Physical Optics MCQs Quiz Test

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 If you are looking first Year Chapter Nine Physics PHYSICAL OPTICS Chapter Wise MCQs question answers, You are here on right website all of these Multiple Choice Question answers are helpful for learning exams MCQs Questions with solutions. Learn these important Key points for upcoming board exams and tests preparations.

1st Year Physics Chapter Nine MCQs
1st Year Physics MCQs Chapter Nine Physical Optics MCQs

On this website you will learn first Year Physics Unit Nine PHYSICAL OPTICS MCQs with solved Answers. Mostly past papers important MCQs are helpful for getting better marks. You will easily learn this chapter by learning these solved MCQs of PHYSICAL OPTICS.

Important Key Points You Will Learn in Chapter Nine:

  • Waterfronts
  • Huygens Principle
  • Interference of Light Waves
  • Young’s Double Slit Experiment
  • Interference in Thin Film
  • Newton’s Rings
  • Michelson Interferometer
  • Diffraction of light
  • Diffraction Grating
  • Diffraction of X-rays by Crystals
  • Polarization

Q.1: Optically active crystals rotate the?
  1. Vibrating plane
  2. Polarization plane
  3. Diffraction plane
  4. Interference plane
B
Q.2: Which is not an optically active substance?
  1. Sugar
  2. Tartaric acid
  3. Water
  4. Sodium chlorate
C
Q.3: In double slit experiment, we observe?
  1. Interference fringes only
  2. Diffraction fringes only
  3. Both interference and diffraction fringes
  4. Polarized fringes
C
Q.4: When light incident normally on thin film, the path difference depends upon?
  1. Thickness of the film only
  2. Nature of the film only
  3. The angle of incidence only
  4. All thickness, nature, and angle of incidence
D
Q.5: Which one of the following properties of light does not change with the nature of the medium?
  1. Velocity
  2. Wavelength
  3. Amplitude
  4. Frequency
D
Q.6: Huygen wave theory explain?
  1. Diffraction
  2. Interference
  3. Polarization
  4. Photoelectric effect
D
Q.7: The photoelectric effect was explained by?
  1. Hertz
  2. Fresnel
  3. Einstein
  4. Plank
C
Q.8: According to Einstein, light travels from one place to another in the form of?
  1. Waves
  2. Particles
  3. Photons
  4. It was not his discovery
C
Q.9: Longitudinal waves do not exhibit?
  1. Reflection
  2. Refraction
  3. Diffraction
  4. Polarization
D
Q.10: Signal from the T.V remote control travels:?
  1. With speed of sound
  2. With the speed of light
  3. With the speed of ultrasonic
  4. With the speed of supersonic
B
Q.11: A point source of light placed in a homogenous medium gives rise to?
  1. A cylindrical wavefront
  2. An elliptical wavefront
  3. Spherical wavefront
  4. A plane wavefront
C
Q.12: The locus of all points in a medium having the same phase of vibration is called?
  1. Crest
  2. Trough
  3. Wavelength
  4. Wavefront
D
Q.13: Which one of the following is nearly monochromatic light?
  1. Light from a fluorescent tube
  2. Light from a mercury lamp
  3. Light from a sodium lamp
  4. Light from a simple lamp
C
Q.14: Two sources of light are coherent if they emit rays of?
  1. Same wavelength
  2. The same amplitude of vibration
  3. Same wavelength with a constant phase difference
  4. Same amplitude and wavelength
C
Q.15: When the crest of one wave falls over the trough of the other wave, this phenomenon is known as?
  1. Polarization
  2. Constructive interference
  3. Destructive interference
  4. Diffraction
C
Q.16: In Young’s double slit experiment, the fringe spacing is equal to (d=slit separation and D = distance of the screen from slits):?
  1. dλD
  2. 2λd/D
  3. λD/d
  4. λd/D
C
Q.17: In the Young double-slit experiment, if white light is used?
  1. Alternate dark and bright fringes will be seen
  2. Coloured fringes will be seen
  3. No interference fringes will be seen
  4. Impossible to predict
B
Q.18: The velocity of light was determined accurately by?
  1. Newton
  2. Michelson
  3. Huygen
  4. Young
B
Q.19: The condition of constructive interference of two coherent beams is that the path difference should be?
  1. Integral multiple of λ/2
  2. Integral multiple of λ
  3. Odd integral multiple of λ/2
  4. Even integral multiple of λ
D
Q.20: In an interference pattern:?
  1. Bright fringes are wider than dark fringes
  2. Dark fringes are wider than bright fringe
  3. Both dark and bright fringes are equal width
  4. Central fringes are dimmer than the outer fringes
C
Q.21: In Young’s double-slit experiment, the separation between the slit is halved and the distance between the slit and screen is doubled. The fringe width is:?
  1. Remain the same
  2. Double
  3. Half
  4. Quadrupled
D
Q.22: The blue color of the sky is due to?
  1. Diffraction
  2. Reflection
  3. Polarization
  4. Scattering
D
Q.23: A light ray traveling from denser to rarer medium suffers a phase change of?
  1. 0°
  2. 90°
  3. 180°
  4. 45°
A
Q.24: When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm, we observe 2000 fringes. What will be a wavelength of light used?
  1. 5000nm
  2. 5000A°
  3. 500m
  4. 2000μm
B
Q.25: Diffraction effect is:?
  1. More for round edge
  2. Less for round edge
  3. More for a sharp edge
  4. Less for a sharp edge
C
Q.26: The wavelength of X – rays is of the order of?
  1. 10A°
  2. 1000A°
  3. 1A°
  4. 100A°
C
Q.27: The wavelength of X-rays falling at a glancing angle of 30° on a crystal with atomic spacing 2 x 10-10m for the first-order diffraction is?
  1. 4×10-10m
  2. 2×10-10m
  3. 0.02×10-10m
  4. 20×10-10m
B
Q.28: A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to?
  1. 500mm
  2. 5×10-3mm
  3. 2×10-5mm
  4. 2×10-3mm
D
Q.29: In a plane-polarized light electric vibration are:?
  1. In all direction
  2. In two mutually perpendicular directions
  3. Taking place perpendicular to the direction of propagation of light
  4. No vibration at all
C
Q.30: Light on passing through a Polaroid is?
  1. Plane polarized
  2. Un-polarized
  3. Circularly polarized
  4. Elliptically polarized
A
Q.31: Which one of the following cannot be polarized?
  1. Radio waves
  2. Ultraviolet rays
  3. X-rays
  4. Ultrasonic waves
D
Q.32: A compact disc having rulings of 0.5 μm each wide shows colors under white light due to?
  1. Equally spaced
  2. Distance between them increases
  3. Distance between them does not remain constant
  4. They are adjacent with no space in between
C
Q.33: In monochromatic red light, a blue book will probably appear to be?
  1. Black
  2. Purple
  3. Green
  4. No scientific reasoning available
A
Q.34: A polarizer is used to?
  1. Reduce the intensity of light
  2. Produce polarized light
  3. Increase intensity of light
  4. Both a and b
D
Q.35: In a double-slit experiment, if one of the two-slit is covered then?
  1. No interference fringes are observed
  2. No diffraction fringes are observed
  3. No fringes observed
  4. Interference pattern not disturbed
A
Q.36: ________ gives the definition of a metre in terms of the wavelength of red cadmium light?
  1. Newton
  2. Einstein
  3. Michelson
  4. Galileo
C
Q.37: In Michelson interferometer to switch the fringe from bright to dark the mirror should be displaced through?
  1. λ/(b)
  2. λ/3
  3. λ/6
  4. λ/4
D
Q.38: In the shadow of a ball the central portion appears bright that happens due to?
  1. Interference
  2. Diffraction
  3. Polarization
  4. Refraction
B
Q.39: Which experiment shows that wavelength of light is smaller than that of sound?
  1. Diffraction
  2. Polarization
  3. Interference
  4. Reflection
A
Q.40: Crystals of material can behave as?
  1. Convex lens
  2. Interferometer
  3. Diffraction grating
  4. Concave
C
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