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Light

198 MCQ questions with answers and explanations · page 7 of 8

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Q151. What is the defect of vision called in which points in one plane of a substance appear to be in the centre, while points in the other plane appear to be off the centre?

  1. Along view
  2. Bdistortion
  3. Cindistinctness
  4. Dnearsightedness
Show answer & explanation

Answer: C) indistinctness

Q152. What type of image do concave lenses always form?

  1. Areal image
  2. Bvirtual image
  3. Cimage of a type corresponding to the characteristic of the object
  4. Dimage of a type corresponding to the curvature of the lens
Show answer & explanation

Answer: B) virtual image

Q153. When a soap bubble is charged, which of the following happens?

  1. AThe radius increases
  2. BThe radius decreases
  3. CThe bubble disappears
  4. DNone of these
Show answer & explanation

Answer: A) The radius increases

Q154. When the sun is near the horizon, that is, in the morning and evening, it appears reddish. What is the reason for this?

  1. ARed light is least scattered by the atmosphere
  2. BRed light is scattered the most by the atmosphere
  3. CThis is the color of the sun in the morning and evening.
  4. DEarth's atmosphere emits red light
Show answer & explanation

Answer: A) Red light is least scattered by the atmosphere

Q155. If the speed (movement) of light in air is 3x108m/sec, what will be the speed of light in a medium whose refractive index is 1⁄2?

  1. A2x18m/s
  2. B9 /4x18m/s
  3. C3/2x18m/s
  4. D3x18m/s
Show answer & explanation

Answer: A) 2x18m/s

Q156. There are seven colors in light. What is the method for separating the colors?

  1. AColours can be separated using a prism.
  2. BFilters can be used to separate colors.
  3. CColors can be separated from plants
  4. DThe colors cannot be distinguished
Show answer & explanation

Answer: A) Colours can be separated using a prism.

Q157. The reason why we see the sun a few minutes before the actual sunrise is-

  1. Ascattering of light
  2. BDiffraction of light
  3. Ctotal internal reflection of light
  4. Drefraction of light
Show answer & explanation

Answer: D) refraction of light

Q158. What will happen if two soap bubbles of different diameters are brought into contact with each other through a tube?

  1. AThe size of both bubbles will remain the same.
  2. BThe small bubble will become smaller and the big bubble will become bigger
  3. CThe smaller bubble will become larger and the larger bubble will become smaller to achieve the same size.
  4. DThe two bubbles will burst as soon as they come in contact.
Show answer & explanation

Answer: D) The two bubbles will burst as soon as they come in contact.

Q159. Energy in reflected light

  1. Adoes not depend on the angle of incidence
  2. Bincreases with increasing angle of incidence
  3. Cdecreases with increasing angle of incidence
  4. DIt becomes maximum when the angle of incidence is equal to 45°.
Show answer & explanation

Answer: A) does not depend on the angle of incidence

Q160. The speed of light is minimum while passing through which of the following?

  1. Aglass
  2. Bvacuum
  3. CWater
  4. DAir
Show answer & explanation

Answer: A) glass

Q161. The colour of a star indicates its-

  1. Aof weight
  2. Bshaped
  3. Cof heat
  4. Dof distance
Show answer & explanation

Answer: C) of heat

Q162. Consider the following natural phenomena: 1. Terrestrial heating 2. Light reflection 3. Light refraction 4. Light diffraction

  1. A1 and 2
  2. B2, 3 and 4
  3. Cand 3
  4. DOnly 4
Show answer & explanation

Answer: A) 1 and 2

Q163. Einstein's equation E=mc represents-

  1. Aof sound velocity
  2. Bof the speed of light
  3. Cof light wavelength
  4. Dconstant
Show answer & explanation

Answer: B) of the speed of light

Q164. On which of the following dates is your shadow the shortest at noon?

  1. A25 December
  2. B21 March
  3. C21 June
  4. D14 February
Show answer & explanation

Answer: C) 21 June

Q165. Sodium vapour lamps are often used for street lighting because-

  1. AThese are cheap.
  2. BTheir light is monochromatic and does not split when passing through water droplets.
  3. CThese are cool to the eyes
  4. DThese give bright light.
Show answer & explanation

Answer: B) Their light is monochromatic and does not split when passing through water droplets.

Q166. Assertion (A): Danger signal is made red in colour. Reason (R): Red colour has the least scattering. Code:

  1. ABoth A and R are correct and R is the correct explanation of A
  2. BBoth A and R are correct, but R is not the correct explanation of A
  3. CA is correct, but R is incorrect
  4. DA is wrong, but R is correct
Show answer & explanation

Answer: A) Both A and R are correct and R is the correct explanation of A

Q167. On rainy days, small oily layers on the water appear brightly colored. What causes this?

  1. Ascattering
  2. Bdispersion
  3. CRefraction
  4. Dpolarization
Show answer & explanation

Answer: B) dispersion

Q168. The swimming pool appears shallower than it actually is because of:

  1. ARefraction
  2. Bscattering
  3. Creflection
  4. Dinterference
Show answer & explanation

Answer: A) Refraction

Q169. A fisherman at the edge of a pond tries to spear a fish. How should he aim accordingly?

  1. AAbove where the fish are visible
  2. Bon the surface of the water
  3. CBelow where the fish are visible
  4. Ddirectly on the fish
Show answer & explanation

Answer: C) Below where the fish are visible

Q170. Photon is the fundamental unit/quantity of what?

  1. ALight
  2. Bgravity
  3. CElectricity
  4. Dmagnetism
Show answer & explanation

Answer: A) Light

Q171. What confirms the particle nature of radiation?

  1. Ainterference
  2. Bphotoelectric effect
  3. CDiffraction
  4. Dpolarization
Show answer & explanation

Answer: B) photoelectric effect

Q172. Presbyopia is a refractive defect of vision caused by which of the following?

  1. AOnly by gradual weakening of the ciliary muscles
  2. Bsimply due to decreased flexibility of the eye lens
  3. CDue to the gradual weakening of both ciliary muscles and the decreased flexibility of the eye lens
  4. DSudden dysfunction of the ciliary muscles and eye lens
Show answer & explanation

Answer: C) Due to the gradual weakening of both ciliary muscles and the decreased flexibility of the eye lens

Q173. How would the sky appear to an astronaut in space?

  1. APurple
  2. BRed
  3. CBlue
  4. DBlack
Show answer & explanation

Answer: D) Black

Q174. A stone is placed at the bottom of a cup filled with water. The apparent depth of the north is-

  1. Aequal to its actual depth
  2. BOrder by its actual depth
  3. COrder by its actual depth
  4. DEither A or C has one
Show answer & explanation

Answer: B) Order by its actual depth

Q175. Which one of the following is correct?

  1. AConvex mirrors are used by doctors to examine the oral cavity.
  2. BConcave mirrors are used as reflectors
  3. CConvex mirrors should be used for shaving
  4. DConvex mirrors are used as reflectors
Show answer & explanation

Answer: B) Concave mirrors are used as reflectors

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