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1st Year Physics Chapter Ten Optical Instruments MCQs Quiz Test

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 If you are looking first Year Chapter Ten Physics OPTICAL INSTRUMENTS 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.

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First Year Optical Instruments MCQs Quiz Test

On this website you will learn first Year Physics Unit Ten OPTICAL INSTRUMENTS 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 OPTICAL INSTRUMENTS.

Important Key Points You Will Learn in Chapter Ten:

  • Magnifying power and resolving power of Optical Instruments
  • Simple Microscope
  • Compound Microscope
  • Astronomical Telescope
  • Spectrometer
  • Speed of light
  • Fibre Optics / its principle/ its types
  • Signal Transmission and conversion of sound
  • Losses of power

Q.1: Large astronomical telescopes are of which type?
  1. Refraction
  2. Reflection
  3. Diffraction
  4. Dispersing
B
Q.2: A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called?
  1. Center of curvature
  2. Focus
  3. Optical center
  4. Aperture
B
Q.3: Who invented photophone?
  1. Graham Bell
  2. Galileo
  3. Torricelli
  4. Maxwell
A
Q.4: In going from a denser to rare medium a ray of light is?
  1. Undaviated
  2. Bent away from the normal
  3. Bent towards the normal
  4. Polarized
B
Q.5: Typical fibre optic communication system uses the light of which wavelength?
  1. 1.3μm
  2. 1.3nm
  3. 13μm
  4. 13nm
A
Q.6: The diamond shines due to:?
  1. Interference
  2. Diffraction
  3. Scattering
  4. Total internal reflection
D
Q.7: If a lens is covered with wax then?
  1. Intensity becomes double
  2. The image will not formed
  3. Intensity will remain the same
  4. Intensity will become half
D
Q.8: The minimum distance between an object and its real image in a convex lens is:?
  1. 2 f
  2. 2.5 f
  3. 3 f
  4. 4 f
D
Q.9: If an object is placed away from ‘2f’ of a converging lens, then the image will be?
  1. Real and erect
  2. Virtual and erect
  3. Real and inverted
  4. Virtual
C
Q.10: If the length of the telescope is 96cm the focal lengths of its lenses is:?
  1. 100cm, -4cm
  2. -80cm, -6cm
  3. 90cm, -6cm
  4. 90cm, 6cm
C
Q.11: The magnifying power of a simple microscope:?
  1. Increase with increase in focal length
  2. Increase with decrease in focal length
  3. No effect with decrease or increase with the focal length
  4. List distance of distinct vision
B
Q.12: Image of an object 5 mm high is only 1 cm high. Magnification produced by a lens is:?
  1. 0.5
  2. 0.2
  3. 1
  4. 2
D
Q.13: The speed of light in the medium of the refractive index of 1.5 is?
  1. 2×108ms-1
  2. 3×108ms-1
  3. 0.5×108mms-1
  4. 1.5×108ms-1
A
Q.14: Least distance of distinct vision of normal and healthy people:?
  1. Increases with increase in age
  2. Decreases with increase in age
  3. Neither increases nor decreases
  4. Becomes infinite after 60 years
A
Q.15: In a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from?
  1. Chromatic aberration
  2. Spherical aberration
  3. Both spherical and chromatic
  4. Distortion
B
Q.16: Two convex lenses of equal focal length ‘f’ are placed in contact, the resultant focal length of the combination is:?
  1. Zero
  2. f
  3. 2 f
  4. f/2
D
Q.17: A convex length of focal length ‘f1’ and concave lens of focal length ‘f2’ are placed in contact. The focal length of the combination is:?
  1.  f2 + f1
  2. f2 – f1
  3. f1f2  / f2 + f1
  4. -f1f2 / f1 – f2
D
Q.18: Final image produced by a compound microscope with respect to the object is?
  1. Real and inverted
  2. Real and erect
  3. Virtual and erect
  4. Virtual and inverted
D
Q.19: For normal adjustment, length of astronomical telescope is:?
  1. fo + fe
  2. fo – fe
  3. fo / fe
  4. fe / fo
A
Q.20: A surfboard moves at an aped of 5ms-1on the crests of the wave. The distance between wave crests is 10m. What is the frequency of the wave motion?
  1. 2 Hz
  2. 5 Hz
  3. 10 Hz
  4. 0.5 Hz
D
Q.21: Dispersion effect may produce an error in light signals. This type of error is minimum in:?
  1. Single-mode step-index fiber
  2. Multimode step-index fiber
  3. Multimode graded-index fiber
  4. Monomode step-index fiber
C
Q.22: Light signals pass through multimode graded-index fiber due to?
  1. Continuous refraction
  2. Total internal reflection
  3. Both continuous refraction and total internal reflection
  4. Diffraction
C
Q.23: Which one type of fibre is more suitable for transmission of signals in which white light is used?
  1. Mono mode step-index fibre
  2. Multimode step-index fibre
  3. Multi-mode graded-index fibre
  4. Single-mode step-index fibre
C
Q.24: Critical angle is that incident angle in denser medium for which angle of refraction is?
  1. 0°
  2. 45°
  3. 90°
  4. 180°
C
Q.25: There is a noticeable boundary between core and cladding for?
  1. Multimode step-index fibre
  2. Multi-mode graded-index fibre
  3. Single-mode step-index fibre
  4. All types of fibre
B
Q.26: The electrical signals change into light signals for transmission through optical fibre. A light pulse represents?
  1. Zero (0)
  2. One (1)
  3. Both zero (0) and one (1)
  4. Either zero (0) or one (1)
B
Q.27: A lens, which is thicker at the center and thinner at the edges, is called?
  1. Concave lens
  2. Convex lens
  3. Plano-convex lens
  4. Plano concave lens
B
Q.28: A spectrometer is used to find?
  1. Wavelength flight
  2. Refractive index of the prism
  3. The wavelength of different colors
  4. All of the above
D
Q.29: If a convex lens of focal length ‘f’ is cut into two identical halves along the lens diameter, the focal length of each half is?
  1. f
  2. f/2
  3. 2f
  4. 3f/2
C
Q.30: A convex and concave lens of focal length ‘f’ are in contact. The focal length of the combination will be?
  1. Zero
  2. f/2
  3. 2f
  4. Infinite
D
Q.31: If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope?
  1. Increases
  2. Decreases
  3. Remain the same
  4. Become half
A
Q.32: In optic fiber transmission system ---------- are used to regenerate the dim light signal?
  1. Diodes
  2. Repeaters
  3. Laser
  4. Transformer
B
Q.33: Magnification of the astronomical telescope is?
  1. fo + fe
  2. fo / fe
  3. fe / fo
  4. (1 + fo/fe) L/fo
B
Q.34: The equation αmin = 1.22 λ/D was devised by?
  1. Newton
  2. Einstein
  3. Raleigh
  4. Planks
C
Q.35: The central image in a compound microscope is:?
  1. Virtual, erect, and magnified
  2. Real, inverted, and smaller than object
  3. Virtual, erected and magnified
  4. Erect, virtual and smaller than final image
D
Q.36: Michelson calculated the speed of light using the instrument?
  1. Spectrometer
  2. Galvanometer
  3. Interferometer
  4. None of these
C
Q.37: Michelson devised the formula to calculate speed of light?
  1. c = 4fd
  2. c = 8fd
  3. c = 16fd
  4. c = 5/2 fd
C
Q.38: The function of collimator in spectrometer is?
  1. To produce parallel beam of light
  2. To filter the light rays
  3. To make them mutually perpendicular
  4. No function
A
Q.39: In optic fibre transmission, the repeaters are separated through a distance of --------- km in newer system?
  1. 300km
  2. 200km
  3. 100km
  4. 20km
C
Q.40: Which color has the maximum angle of deviation in prism?
  1. Red
  2. Blue
  3. Orange
  4. Green
B
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