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
Why does the atmosphere turn red at sunrise and sunset?
- Arefraction of light
- Breflection of light
- Cdispersion of light
- Dscattering of light
Question 2 of 50
Assertion (A): Danger signal is made red in colour. Reason (R): Red colour has the least scattering. Code:
- ABoth A and R are correct and R is the correct explanation of A
- BBoth A and R are correct, but R is not the correct explanation of A
- CA is correct, but R is incorrect
- DA is wrong, but R is correct
Question 3 of 50
What is the function of the iris?
- Acontrolling the amount of light entering the eye
- BReducing the amount of light entering the eye
- Csending images to the image lens
- Dnone of these
Question 4 of 50
There are three basic colours-
- Agreen, yellow, red
- BBlue, Yellow, Red
- CBlue, Red, Green
- DBlue, Yellow, Green
Question 5 of 50
The swimming pool appears shallower than it actually is because of:
- ARefraction
- Bscattering
- Creflection
- Dinterference
Question 6 of 50
What type of wave is a light wave?
- Atransverse
- Blongitudinal
- Cprogressive
- Dsharp
Question 7 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 8 of 50
Approximately how much time does it take for sunlight to reach us?
- A8 minutes
- B2 minutes
- C6 minutes
- D4 minutes
Question 9 of 50
Which instrument is used in submarines to see objects above sea level?
- Apyrometer
- BEpidiascope
- CPereskop
- Dodometer
Question 10 of 50
When does a solar eclipse occur?
- APratipada (New Moon Day)
- Bon the full moon
- CQuarter Moon Days
- Dany day
Question 11 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 12 of 50
What is meant by myopia?
- Afarsightedness
- Bnearsightedness
- Ccolor blindness
- Dnight blindness
Question 13 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 14 of 50
Solar eclipse occurs when-
- AThe moon is in the middle
- BThe earth is in the middle
- Cthe sun is in the middle
- DThe Sun, Moon and Earth are in a straight line and Jupiter is not in that line
Question 15 of 50
Why does the bottom of a beaker filled with liquid appear slightly raised?
- ARefraction
- Binterference
- CDiffraction
- Dreflection
Question 16 of 50
Who first discovered the speed of light?
- AGalileo
- BNewton
- CRomer
- DMichaelson
Question 17 of 50
When a ray of light passes from a rarer medium to a denser medium, it-
- Amoves in a straight direction
- Bbends towards the normal.
- Cmoves away from the normal
- Dnone of these
Question 18 of 50
The focal length of a convex lens is 0.2 m. Its power will be-
- A+2 D
- B2D
- C4D
- D+5 D
Question 19 of 50
Why does an object above the water surface appear to be at a higher height than its actual position to a person underwater?
- Adue to refraction of light
- Bdue to reflection of light
- Cdue to interference of light
- Ddue to diffraction of light
Question 20 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 21 of 50
Farsightedness in old age is a defect in which the lens-
- Aloses its elasticity
- Bbecomes more transparent.
- Cbecomes much smaller
- Dbecomes much smaller
Question 22 of 50
What type of image do concave lenses always form?
- Areal image
- Bvirtual image
- Cimage of a type corresponding to the characteristic of the object
- Dimage of a type corresponding to the curvature of the lens
Question 23 of 50
Internal reflection of light from the sun can occur if the light-
- Ago from air to glass
- Bgo from air to water
- Cgo from glass to air
- Dgo from water to glass
Question 24 of 50
Why does a coin placed in a vessel filled with water appear slightly raised?
- Adue to reflection of light
- Bdue to refraction of light
- Cdue to diffraction of light
- Ddue to dispersion of light
Question 25 of 50
An air bubble in water will act in the same way as it does-
- Aconvex mirror
- Bconvex lens
- Cconcave mirror
- Dconcave lens
Question 26 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 27 of 50
The splitting of different colours of light in a prism is called-
- Areflection of light
- Brefraction of light
- CDiffraction of light
- Ddispersion of light
Question 28 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 29 of 50
Sunglasses have the power to
- A0 diopters
- B1 diopter
- C2 diopters
- D4 diopters
Question 30 of 50
Photoelectric effect was propounded by-
- ACompton
- BMaxwell
- CEinstein
- DNewton
Question 31 of 50
What does a ray of light traveling from a denser to a rarer medium with an angle of incidence greater than the critical angle of the corresponding mean pair do?
- ADiffraction
- Btotal internal reflection
- CParavan
- DRefraction
Question 32 of 50
Some transport vehicles have additional yellow lights. This is done because:
- AThe vehicle looks beautiful when the light is yellow.
- BYellow light consumes less electrical energy
- CYellow light penetrates fog, making the road clearer, so yellow lights are useful on foggy nights.
- DYellow light does not glare at the eyes of people walking on the road
Question 33 of 50
A person suffering from farsightedness-
- ADistant objects are not visible
- BNearby objects are not visible.
- Cobjects appear skewed
- DObjects appear upside down
Question 34 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 35 of 50
Which part of the Sun is visible during a solar eclipse?
- Achromosphere
- Bcrown or corona
- Chalo
- DNo parts
Question 36 of 50
In which is the velocity of light maximum?
- Adiamonds
- BWater
- Cvacuum
- Dhydrogen
Question 37 of 50
The formation of bright colours in thin soap foam is the result of which phenomenon?
- AMultiple reflection and interference
- BMultiple refraction and dispersion
- CRefraction and Dispersion
- DPolarization and interference
Question 38 of 50
The human eye is similar to a camera, so it has a lens body. What makes up the eye lens?
- Athe upright or vertical real image of an object on the retina
- Binverted, virtual image of an object on the retina
- Cthe inverted, real image of an object on the retina
- DThe straight or vertical real image of the body on the iris
Question 39 of 50
On rainy days, small oily layers on the water appear brightly colored. What causes this?
- Ascattering
- Bdispersion
- CRefraction
- Dpolarization
Question 40 of 50
Which part of the eye controls the amount of light entering the eye?
- Aretina
- Bcornea
- CIris
- DI ball
Question 41 of 50
What will happen if two soap bubbles of different diameters are brought into contact with each other through a tube?
- AThe size of both bubbles will remain the same.
- BThe small bubble will become smaller and the big bubble will become bigger
- CThe smaller bubble will become larger and the larger bubble will become smaller to achieve the same size.
- DThe two bubbles will burst as soon as they come in contact.
Question 42 of 50
When a compact disc (CD) is viewed in sunlight, a rainbow-like display of colors is seen. This can be explained by—
- ABased on the phenomena of reflection and diffraction
- BBased on the phenomena of reflection and transmission
- CBased on the phenomena of diffraction and transmission
- DBased on the phenomena of refraction, diffraction and transmission
Question 43 of 50
What is used in biology laboratories to view magnified images of microscopic cells or organisms?
- Aphoto camera
- BSimple microscope
- Ccompound microscope
- DVisionary
Question 44 of 50
Which of the following is correct regarding the formula 1/f=1/v=1/u according to the Cartesian sign convention, where the symbols have their usual meanings?
- AThis applies only to spherical mirrors.
- BThis applies only to spherical lenses.
- CThis applies to spherical mirrors as well as spherical lenses.
- DThis is an invalid formula lens, concave, and has a focal length of 2.0 m.
Question 45 of 50
Red light is used in traffic signals because-
- AThe color of blood is red
- BAnimals can detect the color red
- CRed colour is least dispersed
- DRed symbolizes danger
Question 46 of 50
What type of lens is used in a camera?
- AConvex
- Bconcave
- Ccircular
- Dof uniform thickness
Question 47 of 50
A person with myopia can see-
- Asee nearby objects clearly
- Bto see distant objects clearly
- CSee both near and far objects clearly
- DNeither near nor far objects are clearly visible
Question 48 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 49 of 50
Light is made up of tiny particles called-
- Anuclear
- BNeutron
- CPositron
- Dphoton
Question 50 of 50
When the sun is near the horizon, that is, in the morning and evening, it appears reddish. What is the reason for this?
- ARed light is least scattered by the atmosphere
- BRed light is scattered the most by the atmosphere
- CThis is the color of the sun in the morning and evening.
- DEarth's atmosphere emits red light