Practice Dispersion Of Light Multiple Choice Questions with Answers Quiz-1

Q.1.

What is a Spectrum?

A band of 7 colors
A group of 10 colors
A band of 10 colors
A mixture of 7 colors

Q.2.

What is the spectrum?

A disturbance that transfers energy from place to place
The ability to do work
What we see when specific light reflects off of an object
The range of visible color

Q.3.

At noon the sun appears white as

light is least scattered
all the colours of the white light are scattered away
blue colour is scattered the most
red colour is scattered the most

Q.4.

Rainbow is formed due to

Natural dispersion
Sunlight passing through raindrops
Refraction of light
All of the above

Q.5.

Twinkling of stars is due to atmospheric

dispersion of light by water droplets
refraction of light by different layers of varying refractive indices
scattering of light by dust particles
internal reflection of light by clouds.

Q.6.

The clear sky appears blue because

blue light gets absorbed in the atmosphere.
ultraviolet radiations are absorbed in the atmosphere.
violet and blue lights get scattered more than lights of all other colours by the atmosphere.
light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

Q.7.

A reflection of sound

reflection
refraction
dispersion
echo

Q.8.

Why don't planets twinkle ?

They are very close to us
They twinkle but we cannot see
They are very large objects
They are continuosly revolving around sun

Q.9.

At what position of the object does a convex lens act as a magnifying glass?

between F and 2F
between F and O
beyond F
beyond 2F

Q.10.

Why do stars twinkle ?

Stars do not really twinkle, they just appear to twinkle when seen from the surface
so you can see at night
so the sky looks nice
so you can see constellations

Q.11.

Which of the following is NOT a source of light?

eyes
lit candle
sun
firefly

Q.12.

Myopia is corrected by using spectacles with

convex lenses.
concave lenses.
glass slabs.
prisms.

Q.13.

Which colour scatters the most?

Red
Green
Blue
Yellow

Q.14.

When white light enters a prism, it gets split into its constituent colours. This is due to

different refractive index for different wavelength of each colour
each colours has same velocity in the prism.
prism material have high density.
Scattering of light

Q.15.

Why does scattering of light occur?

Light rays are blocked and reflected to all directions by the clouds or particles in the air
Light rays are blocked and reflracted to all directions by the clouds or particles in the air
Light rays are passing through and refracted to all directions by the clouds or particles in the air

Q.16.

Refraction of light by the earth’s atmosphere due to variation in air density is called

atmospheric reflection
atmospheric dispersion
atmospheric scattering
atmospheric refraction

Q.17.

What is the relation between angle of incidence and angle of refraction when light goes from optically rarer to denser

Angle I is equal to angle r
Angle I is greater than angle r
Angle I is less than angle r
No relation between these angles

Q.18.

The splitting of white light into its constituent colours is called

refraction.
dispersion.
deviation.
displacement.

Q.19.

Light has the lowest velocity in which medium?flint glass n=1.70barium glass n=1.60crown glass n=1.523water n=1.33diamond n=2.45

diamond
water
flint glass
barium glass

Q.20.

Why does an apple appear red?

All colors are absorbed & none are reflected
All colors are absorbed except for blue, which is reflected
All colors are reflected and none are absorbed
All colors are absorbed except for red, which is reflected

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