Light: MCQ Test (25 questions)

Question 1 of 25

Which secondary color is obtained by mixing two primary colors, red and blue?

AWhite
BYellow
CMagenta
DCyan

Question 2 of 25

Broken glass appears to be cracked.

ACauses of refraction
Bdue to reflection
Cdue to interference
Ddue to total internal reflection

Question 3 of 25

The bending of light from the edge of an obstacle is called-

Adeflection
BDiffraction
CRefraction
Dinterference

Question 4 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 5 of 25

The nature of light radiation is-

Awave-like
Bparticle-like
Clike both waves and particles
Dnot like a wave or a particle

Question 6 of 25

How many colours does a rainbow show?

A7
B10
C12
D5

Question 7 of 25

Which of the following statements is not correct for light rays?

Alight travels at different speeds in different media
BLight travels in air at a speed of about 300 million meters per second
CAs light leaves the surface of water and enters the air, its speed slows down
DAs light leaves the glass surface and enters the air, its speed increases

Question 8 of 25

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

Aconvex lens
Bconcave lens
Cflat lens
Dplano-concave lens

Question 9 of 25

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

A5
B6
C7
D8

Question 10 of 25

Which of the following types of light is absorbed most rapidly by plants?

APurple and orange
Bblue and red
CIndigo and yellow
DYellow and purple

Question 11 of 25

What is meant by myopia?

Afarsightedness
Bnearsightedness
Ccolor blindness
Dnight blindness

Question 12 of 25

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

ARefraction
Bscattering
Creflection
Dinterference

Question 13 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 14 of 25

What do vehicles use to see objects coming from behind?

AConvex lacing
Bconcave lens
Cconvex mirror
Dconcave mirror

Question 15 of 25

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 16 of 25

Which type of mirror is used in the headlights of vehicles?

Aplane mirror
Bconvex mirror
Cconcave mirror
DParabolic mirror

Question 17 of 25

Who first discovered the speed of light?

AGalileo
BNewton
CRomer
DMichaelson

Question 18 of 25

The maximum duration of a total solar eclipse is-

A250 seconds
B460 seconds
C500 seconds
D600 seconds

Question 19 of 25

Which one of the following types of glass can cut off ultraviolet rays?

Asoda glass
BPyrex glass
CJenna Glass
DCrookes glass

Question 20 of 25

What causes a rainbow?

ARefraction and Dispersion
BScattering and refraction
CDiffraction and refraction
DRefraction and reflection

Question 21 of 25

What is the name of the phenomenon (driven by the scattering of light) that causes mountain tops to turn pink or orange at sunrise and sunset?

ABrillouin scattering
Bstate of confusion
CAlpenglow
DBarrel distortion

Question 22 of 25

The wave theory of light was established by whom?

ANewton
BHuygens
CPlank
DFaraday

Question 23 of 25

Which of the following colours has the maximum wavelength?

ABlue
BYellow
CGreen
DRed

Question 24 of 25

Which of the following has the highest energy?

Ablue light
Bgreen light
Cred light
DYellow light

Question 25 of 25

The focal length of a lens is 25 cm. Its power will be-

A+2D
B+4D
C-2 D
D4D