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Light

198 MCQ questions with answers and explanations · page 5 of 8

Test yourself▶ 25 question test▶ 50 question test

Q101. When red glass is heated at high temperature, it will appear-

  1. ARed
  2. BGreen
  3. CBlue
  4. DYellow
Show answer & explanation

Answer: B) Green

Q102. The colour of light is determined by-

  1. Aby velocity
  2. BBy dimension
  3. CBy wavelength
  4. DBy frequency
Show answer & explanation

Answer: C) By wavelength

Q103. How many colours are there in the sun's rays?

  1. A5
  2. B6
  3. C7
  4. D8
Show answer & explanation

Answer: C) 7

Q104. If there is no atmosphere, what colour will the sky appear from the Earth?

  1. ABlack
  2. BBlue
  3. Corange
  4. DRed
Show answer & explanation

Answer: A) Black

Q105. What are the primary colors in photography?

  1. ARed, Blue, Yellow
  2. BRed, Yellow, Green
  3. CRed, Blue, Green
  4. DBlue, Yellow, Green
Show answer & explanation

Answer: C) Red, Blue, Green

Q106. The light with the shortest wavelength is-

  1. ARed
  2. BYellow
  3. CBlue
  4. DPurple
Show answer & explanation

Answer: D) Purple

Q107. When red, green and blue colours of light are mixed in equal proportions, the resultant colour will be-

  1. AMagenta
  2. BBlack
  3. CBlack
  4. DShyam
Show answer & explanation

Answer: B) Black

Q108. Which part of a photographic camera acts like the retina of the eye?

  1. Alight hole
  2. Bshutter
  3. Clens
  4. DMovie
Show answer & explanation

Answer: D) Movie

Q109. What type of lens is used in a camera?

  1. AConvex
  2. Bconcave
  3. Ccircular
  4. Dof uniform thickness
Show answer & explanation

Answer: A) Convex

Q110. The decrease in the ability of the eye to focus on near and distant objects with age is called-

  1. APresbyopia
  2. BAstigmatism
  3. CHypermetropia
  4. Dmyopia
Show answer & explanation

Answer: A) Presbyopia

Q111. What is the function of the iris?

  1. Acontrolling the amount of light entering the eye
  2. BReducing the amount of light entering the eye
  3. Csending images to the image lens
  4. Dnone of these
Show answer & explanation

Answer: A) controlling the amount of light entering the eye

Q112. The image formed on the retina is-

  1. AEqual to the object but inverted
  2. Bsmaller than the object but straight
  3. Cparallel to but perpendicular to the object
  4. Dsmaller than the object but opposite
Show answer & explanation

Answer: D) smaller than the object but opposite

Q113. Which part of the eye controls the amount of light entering the eye?

  1. Aretina
  2. Bcornea
  3. CIris
  4. DI ball
Show answer & explanation

Answer: C) Iris

Q114. In eye donation, which part of the donor's eye is transplanted?

  1. Acornea
  2. Blens
  3. Cretina
  4. DWhole eye
Show answer & explanation

Answer: A) cornea

Q115. At which place in the human eye do light waves get converted into nerve impulses?

  1. Afrom the cornea
  2. Bfrom the eye of the star
  3. Cfrom the retina
  4. Dfrom the lens
Show answer & explanation

Answer: C) from the retina

Q116. The least distance of clear vision for a normal healthy human eye is measured at-

  1. A50cm
  2. B10cm
  3. C15cm
  4. D25cm
Show answer & explanation

Answer: D) 25cm

Q117. If a person cannot see distant objects clearly, what defect will he have in his vision?

  1. Along-sightedness
  2. Bnearsightedness
  3. Cvision [astigmatism]
  4. Dnone of these
Show answer & explanation

Answer: B) nearsightedness

Q118. A person with myopia can see-

  1. Asee nearby objects clearly
  2. Bto see distant objects clearly
  3. CSee both near and far objects clearly
  4. DNeither near nor far objects are clearly visible
Show answer & explanation

Answer: A) see nearby objects clearly

Q119. The disease of nearsightedness is cured by—

  1. Aby a convex lens
  2. Bby a concave lens
  3. Cby cylindrical lens
  4. Dnone of these
Show answer & explanation

Answer: B) by a concave lens

Q120. A person suffering from farsightedness-

  1. ADistant objects are not visible
  2. BNearby objects are not visible.
  3. Cobjects appear skewed
  4. DObjects appear upside down
Show answer & explanation

Answer: B) Nearby objects are not visible.

Q121. Which lens is used in the spectacles of a person suffering from farsightedness?

  1. Aconvex lens
  2. Bconcave lens
  3. Cflat lens
  4. Dplano-concave lens
Show answer & explanation

Answer: A) convex lens

Q122. Farsightedness in old age is a defect in which the lens-

  1. Aloses its elasticity
  2. Bbecomes more transparent.
  3. Cbecomes much smaller
  4. Dbecomes much smaller
Show answer & explanation

Answer: D) becomes much smaller

Q123. Which lens can correct colour blindness?

  1. Aconcave lens
  2. Bconvex lens
  3. Ccylindrical lens
  4. Dnone of these
Show answer & explanation

Answer: D) none of these

Q124. Used for the treatment of presbyopia-

  1. Aconcave lens
  2. Bconvex lens
  3. Cconvex mirror
  4. Dbifocal lenses
Show answer & explanation

Answer: D) bifocal lenses

Q125. The human eye is similar to a camera, so it has a lens body. What makes up the eye lens?

  1. Athe upright or vertical real image of an object on the retina
  2. Binverted, virtual image of an object on the retina
  3. Cthe inverted, real image of an object on the retina
  4. DThe straight or vertical real image of the body on the iris
Show answer & explanation

Answer: C) the inverted, real image of an object on the retina

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