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1
The scattering of longer wavelengths of light increases as the size of the particles __________________.
Decreases
Increases
Both (a) and (b) are correct.
None of these
2
Which of the colours of visible light has minimum frequency ?
Violet
Red
Yellow
Green
3
When white light is incident on small suspended particles, more of the shorter wavelengths of _________________ get scattered. Very little of longer wavelengths of __________________ get scattered.
Blue light, Orange light
Red light, Violet light
Blue light, Red light
Red light, blue light
4
How many colors is white light made up of ?
A single colour
Primary colours
Five colours
Seven colours
5
The sky looks blue on a clear,sunny day because of ___________________.
Dispersion of light
Scattering of light
Reflection oflight
Refraction of light
6
When light enters the atmosphere it strikes on extremely fine particles, which deflects the rays of light in all possible direction, this is due to _____________.
Reflection of light
Atmospheric refraction
7
The following one is not a primary colour __________________.
Blue
8
Which of the following are correct :
(a) Clouds look white because of scattering by large drops of water in it.
(b) When white light is incident on small suspended particles it gets scattered.
Only (a) is correct.
Only (b) is correct.
9
Which of the following options defines dispersion.
Avery unclear picture image of an object obtained on a plane mirror.
In a plane mirror our right appears to be image's left then this is dispersion.
Splitting of light into its constituent colours.
All the above
10
(a) The scattering of longer wavelengths of light increases as the size of the particles increases.
(b) Large particles scatter lights of all wavelengths equally well.
11
12
_________________ was the first person who discovered that sunlight is made up of seven colors.
Issac Newton
Dalton
Einstein
James Hooke
13
The sky appears blue because __________________
That is its natural color.
The earth's atmosphere emits blue light.
The air away from the sun cools downand turns blue.
The earth's atmosphere scatters more blue light than red.
14
The phenomenon of splitting light into its component colours due to the dependence of refractive index on___________ is called the dispersion of light.
Frequency
Wavelength
Velocity
15
The dispersion of light when it passes through a prism shows that ____________
The prism contains many narrow, equally spaced slits.
All colors in the light are treated the same
Different colors have different indices of refraction
The speed of light in a vacuum is a constant