Light: MCQ Test
50 questions · pick one option for each · submit when you finish to see your score and the correct answers.
Question 1 of 50
Sunglasses have the power to
- A0 diopters
- B1 diopter
- C2 diopters
- D4 diopters
Question 2 of 50
man cannot see clearly objects more than 10 meters away. What defect of vision does he suffer from?
- AHypermetropia
- BHydrophobia
- Cmyopia
- DCataract
Question 3 of 50
On which of the following dates is your shadow the shortest at noon?
- A25 December
- B21 March
- C21 June
- D14 February
Question 4 of 50
The disease of nearsightedness is cured by—
- Aby a convex lens
- Bby a concave lens
- Cby cylindrical lens
- Dnone of these
Question 5 of 50
What is the part of the human eye on which the image is formed called?
- Apupil
- Bcornea
- Cretina
- DIris
Question 6 of 50
Which of the following theories confirms the wave nature of light?
- ANewton's corpuscular theory
- BTheory of interference
- Celectromagnetic wave theory of light
- Dnone of these
Question 7 of 50
What is the phenomenon called that creates a mirage?
- Ainterference
- BDiffraction
- Cpolarization
- Dtotal internal reflection
Question 8 of 50
The reason why we see the sun a few minutes before the actual sunrise is-
- Ascattering of light
- BDiffraction of light
- Ctotal internal reflection of light
- Drefraction of light
Question 9 of 50
Which of these is correct?
- A1/f=1/u=1/v
- Bf=D/2
- C1/f-1/u+1/v
- Df=u+v
Question 10 of 50
What is meant by myopia?
- Afarsightedness
- Bnearsightedness
- Ccolor blindness
- Dnight blindness
Question 11 of 50
Which part of a photographic camera acts like the retina of the eye?
- Alight hole
- Bshutter
- Clens
- DMovie
Question 12 of 50
A lemon kept in a glass of water appears larger than its actual size, why does this happen?
- Areflection of light
- Bscattering of light
- Crefraction of light
- Dpolarization of light
Question 13 of 50
Broken glass appears to be cracked.
- ACauses of refraction
- Bdue to reflection
- Cdue to interference
- Ddue to total internal reflection
Question 14 of 50
Consider the following phenomena: 1. Size of the Sun at dusk 2. Colour of the Sun at dawn 3. Appearance of the Moon at dawn 4. Twinkling of stars in the sky 5. Appearance of the Pole Star in the sky Which of the above are optical illusions?
- A1, 2 and 3
- B3, 4 and 5
- C1, 2 and 4
- D2, 3 and 5
Question 15 of 50
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?
- A2x18m/s
- B9 /4x18m/s
- C3/2x18m/s
- D3x18m/s
Question 16 of 50
Which of the following phenomena verifies the fact that light travels much faster than sound?
- Atwinkling stars in the night sky
- Bburning of a matchstick
- Cthunderstorm
- Dmirage
Question 17 of 50
Two plane mirrors are placed at a 90° angle and a candle is burning between them. How many images of the candle will be formed in the mirrors?
- A2
- B3
- C4
- Dinfinity
Question 18 of 50
Which of the following phenomena helps in deciding that light is a transverse wave?
- Ainterference
- BDiffraction
- Cpolarization
- DRefraction
Question 19 of 50
The wave theory of light was established by whom?
- ANewton
- BHuygens
- CPlank
- DFaraday
Question 20 of 50
Which of the following is not a result of atmospheric refraction?
- Athe sun appearing two or three minutes before its actual sunrise
- Bthe sun appears red at sunset
- CThe sun appears higher in the sky than its actual height
- Dtwinkling stars at night
Question 21 of 50
If an object is placed between two parallel plane mirrors, then the number of images formed is-
- A4
- B1
- C2
- Dinfinite
Question 22 of 50
Which lens can correct colour blindness?
- Aconcave lens
- Bconvex lens
- Ccylindrical lens
- Dnone of these
Question 23 of 50
A spherical air bubble is embedded in a piece of glass. How does the bubble behave for a ray of light passing through it?
- Aplane diverging lens
- BDiverging lens
- Cplane converging lens
- Dconverging lens
Question 24 of 50
Approximately how much time does it take for light to travel from the Moon to the Earth?
- A8 minutes
- B8 seconds
- C1 second
- D100 seconds
Question 25 of 50
The telescope was invented by-
- AGalileo
- BGutenberg
- CEdison
- Dreceptive well
Question 26 of 50
Light enters the eye through a thin membrane, what is this membrane called?
- Aretina
- Bcornea
- Cpupil
- DIris
Question 27 of 50
When light is scattered by a molecule and the frequency of the scattered light changes, what is this phenomenon called?
- ARayleigh scattering
- BRaman effect
- Cphotoelectric effect
- DRutherford scattering
Question 28 of 50
The sea appears blue
- ADue to the greater depth
- BDue to reflection from the sky and scattering of light by water particles
- CDue to the blue colour of the water
- Ddue to the surface of the water
Question 29 of 50
The stars twinkle-
- ACauses of refraction
- Bdue to reflection
- Cdue to polarization
- Ddue to scattering
Question 30 of 50
Who discovered the electromagnetic nature of light?
- ASnell
- BNewton
- CMaxwell
- DYoung
Question 31 of 50
Why does the bottom of a beaker filled with liquid appear slightly raised?
- ARefraction
- Binterference
- CDiffraction
- Dreflection
Question 32 of 50
The bending of light from the edge of an obstacle is called-
- Adeflection
- BDiffraction
- CRefraction
- Dinterference
Question 33 of 50
When does a solar eclipse occur?
- APratipada (New Moon Day)
- Bon the full moon
- CQuarter Moon Days
- Dany day
Question 34 of 50
Which part of the Sun is visible during a solar eclipse?
- Achromosphere
- Bcrown or corona
- Chalo
- DNo parts
Question 35 of 50
Who first discovered the speed of light?
- AGalileo
- BNewton
- CRomer
- DMichaelson
Question 36 of 50
What causes a rainbow?
- ARefraction and Dispersion
- BScattering and refraction
- CDiffraction and refraction
- DRefraction and reflection
Question 37 of 50
Energy in reflected light
- Adoes not depend on the angle of incidence
- Bincreases with increasing angle of incidence
- Cdecreases with increasing angle of incidence
- DIt becomes maximum when the angle of incidence is equal to 45°.
Question 38 of 50
A person cannot see clearly objects less than 1 meter away. What defect does that person suffer from?
- Along-sightedness
- Bnearsightedness
- CDisease of the rhythm
- DNone of these
Question 39 of 50
How would the sky appear to an astronaut in space?
- APurple
- BRed
- CBlue
- DBlack
Question 40 of 50
At which place in the human eye do light waves get converted into nerve impulses?
- Afrom the cornea
- Bfrom the eye of the star
- Cfrom the retina
- Dfrom the lens
Question 41 of 50
Rainbows are formed when sunlight-
- ARefraction and internal reflection of light falling on raindrops in the atmosphere
- BIt gets reflected and diffused after falling on raindrops suspended in the atmosphere.
- Cfalling on raindrops in the atmosphere and gets radiated after refraction
- DNone of the given statements is correct
Question 42 of 50
Used to cure farsightedness
- Aconcave lens
- Bconvex mirror
- Cconvex lens
- Dconcave mirror
Question 43 of 50
There are three basic colours-
- Agreen, yellow, red
- BBlue, Yellow, Red
- CBlue, Red, Green
- DBlue, Yellow, Green
Question 44 of 50
Which one of the following is not correct about the image formed by a plane mirror?
- AIts shape is the same as that of the object used.
- BIt is laterally inverted
- CIt is a real mirror image
- DIt is formed at the same distance behind the mirror as the object is in front of the mirror.
Question 45 of 50
The image formed on the retina is-
- AEqual to the object but inverted
- Bsmaller than the object but straight
- Cparallel to but perpendicular to the object
- Dsmaller than the object but opposite
Question 46 of 50
The process of separation of white light into its different colours is called-
- Ascattering
- Bdispersion
- CDiffraction
- Dcharacter deflection
Question 47 of 50
What is the colour of the light emitted by the Sun?
- AWhite
- BRed
- CYellow
- Dorange
Question 48 of 50
The Sun appears red at sunrise and sunset. What is the phenomenon in optics called that is responsible for the Sun appearing this way?
- Areflection
- Btotal internal reflection
- Cscattering
- Dinterference
Question 49 of 50
A stone is placed at the bottom of a cup filled with water. The apparent depth of the north is-
- Aequal to its actual depth
- BOrder by its actual depth
- COrder by its actual depth
- DEither A or C has one
Question 50 of 50
A lens has a power of 2.0 D. What does D stand for here?
- Adilation
- BDistance
- CDiopter
- Ddegree