Light: MCQ Test (25 questions)

Question 1 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 2 of 25

What is meant by myopia?

Afarsightedness
Bnearsightedness
Ccolor blindness
Dnight blindness

Question 3 of 25

The telescope was invented by-

AGalileo
BGutenberg
CEdison
Dreceptive well

Question 4 of 25

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 5 of 25

The light with the shortest wavelength is-

ARed
BYellow
CBlue
DPurple

Question 6 of 25

The speed of light in water, glass and diamond is in the following order:

ADiamond > Glass > Water
BWater > Glass > Diamond
CGlass > Diamond > Water
DDiamond > Water > Glass

Question 7 of 25

Why does the atmosphere turn red at sunrise and sunset?

Arefraction of light
Breflection of light
Cdispersion of light
Dscattering of light

Question 8 of 25

Photon is the fundamental unit/quantity of what?

ALight
Bgravity
CElectricity
Dmagnetism

Question 9 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 10 of 25

Which optical instrument is used to observe distant objects?

ASimple microscope
Bcompound microscope
Celectron microscope
DVisionary

Question 11 of 25

In which year did Ole Rømer measure the speed of light for the first time in history?

A1776 AD
B1676 AD
C1876
D1867 AD

Question 12 of 25

The least distance of clear vision for a normal healthy human eye is measured at-

A50cm
B10cm
C15cm
D25cm

Question 13 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 14 of 25

Who first showed that light waves undergo diffraction?

Agremandy
BYoung
CMaxwell
DFoucault

Question 15 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 16 of 25

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 17 of 25

What is used in biology laboratories to view magnified images of microscopic cells or organisms?

Aphoto camera
BSimple microscope
Ccompound microscope
DVisionary

Question 18 of 25

What is the colour of the light emitted by the Sun?

AWhite
BRed
CYellow
Dorange

Question 19 of 25

The colour of a star indicates its-

Aof weight
Bshaped
Cof heat
Dof distance

Question 20 of 25

Why does the bottom of a beaker filled with liquid appear slightly raised?

ARefraction
Binterference
CDiffraction
Dreflection

Question 21 of 25

Which of the following colour combinations is most convenient during day and night?

AOrange and blue
Bwhite and black
CYellow and Blue
Dred and green

Question 22 of 25

How many images will be formed by two mirrors inclined at 120° to each other?

A4
B3
C2
D1

Question 23 of 25

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 24 of 25

The colour of light is determined by its-

ABy dimension
Bby wavelength
Cintensely
Dwith speed

Question 25 of 25

Who first discovered the speed of light?

AGalileo
BNewton
CRomer
DMichaelson