Light: MCQ Test (25 questions)

Question 1 of 25

The colour of light is determined by-

Aby velocity
BBy dimension
CBy wavelength
DBy frequency

Question 2 of 25

The process of separation of white light into its different colours is called-

Ascattering
Bdispersion
CDiffraction
Dcharacter deflection

Question 3 of 25

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 4 of 25

Diopter is the unit of what?

Apower of the lens
Bfocal length of the lens
Cof the intensity of light
Dintensity of sound

Question 5 of 25

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 6 of 25

The correct relation between the radius of curvature r and the focal length of a spherical mirror is-

ARf
BR-2f
CR=3f
DR=4f

Question 7 of 25

When three images of an object are to be obtained with the help of plane mirrors, what should be the angle between the mirrors?

A0°
B60°
C90°
D45°

Question 8 of 25

What will be the angle of refraction for a ray of light entering the glass medium from water at an angle of incidence of 0°?

A90°
B45°
C0°
DThe rays will not penetrate at all.

Question 9 of 25

A lens has a power of +2.0 diopters. Which of the following statements is correct about the lens?

AThe lens is concave and its focal length is 0.5 m.
BThe lens is convex and has a focal length of 2.0 m.
CThe lens is convex and its focal length is 0.5 m.
DThe lens is concave and its focal length is 2.0 m.

Question 10 of 25

What confirms the particle nature of radiation?

Ainterference
Bphotoelectric effect
CDiffraction
Dpolarization

Question 11 of 25

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 12 of 25

What is the phenomenon called that creates a mirage?

Ainterference
BDiffraction
Cpolarization
Dtotal internal reflection

Question 13 of 25

Lunar eclipse occurs in-

Aon the new moon day
Bfull moon day
CNew moon and full moon days
Dcrescent moon day

Question 14 of 25

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 15 of 25

The image we see in a plane mirror is-

Ais real and therefore can be photographed
Bis virtual and is closer than the object
Cis virtual and is laterally inverted
DIt is real and cannot be photographed.

Question 16 of 25

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 17 of 25

Which part of the Sun is visible during a solar eclipse?

Achromosphere
Bcrown or corona
Chalo
DNo parts

Question 18 of 25

If a ray of light enters from a rarer medium to a denser medium at zero angle of incidence, then it-

Awill be reflected back
Bwill go straight
Cwill turn right
Dwill turn at 45°

Question 19 of 25

Transmission of light energy in optical fibre is done by the application of the following phenomenon. Transmission of light energy in optical fibre is done by the application of the following phenomenon-

Atotal internal reflection
BDiffraction
Cscattering
DRefraction

Question 20 of 25

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 21 of 25

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

Acornea
Blens
Cretina
DWhole eye

Question 22 of 25

What causes the twinkling of stars?

Adue to the specific frequencies of starlight
Bdue to reflection of starlight from the ocean surface
CDue to atmospheric refraction of starlight
Ddue to the Earth's magnetic field

Question 23 of 25

Photoelectric effect was propounded by-

ACompton
BMaxwell
CEinstein
DNewton

Question 24 of 25

If the power of the lens of a spectacle is + 2 diopters, then its focal length will be-

A200 cm
B100 cm
C50 cm
D2 cm

Question 25 of 25

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