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- 1. Multiple Choice
The eye is more sensitive to yellow colour but why are dangers signals painted red instead of yellow?
The scattering of red light is much less than that of yellow light
The scattering of red light is more than that of yellow light
Yellow light, when scattered, is brighter
Red light, when scattered, is brighter
- 2. Multiple Choice
Read the passage carefully and answer the following question. A beam of white light falling on a glass prism gets split into seven colours marked 1 to 7 as shown in figure. Which of the following statements is correct?
The colour at position marked 5 is similar to the colour of gold metal
The colour at position marked 2 has longer wavelength than 1
The colour at position marked 7 is violet
The colour at position marked 5 has higher speed than 1
- 3. Multiple Choice
An object absorbed all the seven colours and does not reflect even one. What is its colour?
Black
White
Red
Yellow
- 4. Multiple Choice
If the earth had no atmosphere, how would the sky appear?
Colourless
White
Black
Blue
- 5. Multiple Choice
Two equilateral prisms are arranged as shown in diagram. If white light incident on prism X then
Statement 1: The ray of light which emerges out of the prism Y will be white light.
Statement 2: The refraction produced by the prism Y is equal and opposite to that produced by prism X.
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1
Statement 1 is true but statement 2 is false
Statement 1 is false but statement 2 is true
- 6. Multiple Choice
The colour that is scattered the least by the tiny particles and the atoms/molecules of the atmosphere is
Red
Violet
Yellow
Green
- 7. Multiple Choice
In which of the following case, dispersion is likely to occur?
Rainbow
Glass prism
Glass slab
Both 1 & 2
- 8. Multiple Choice
The seven coloured lights of the spectrum can be recombined when two prisms are placed in
Spectrum
Dispersion
Tyndall effect
Scattering
- 9. Multiple Choice
Stars appear to be higher in the sky than actually they are because of
Scattering of light
Atmospheric reflection
Dispersion of light
Atmospheric refraction
- 10. Multiple Choice
You cannot see through because
Light suffers total internal reflection at the droplets of fog
Light is scattered by the droplets of frog
Refractive index of fog is infinity
Fog absorbs all the light
- 11. Multiple Choice
The cold air layer of the atmosphere behave as optically
Rarer medium
Inactive medium
Denser medium
None of the above
- 12. Multiple Choice
Sun appears to be risen before actual sun rise because of
Atmospheric dispersion
Atmospheric scattering
Atmospheric refraction
Atmospheric reflection
- 13. Multiple Choice
The sun can be seen before the actual sun rise by about
2 minutes
2 seconds
4 minutes
4 seconds
- 14. Multiple Choice
On a clear day, the sun appears to be more blue towards the overhead (zenith) than it does towards the horizon. This occurs because
Atmosphere is denser higher up than it is at earth's surface
Temperature of upper atmosphere is higher than it is at earth's surface
Sunlight travels over a longer path at horizon, resulting in more absorption
None of the above
- 15. Multiple Choice
To an observer on earth, the stars appear to twinkle. This is due to
the fact that stars do not emit light continuously
frequent absorption of star light by earth's atmosphere
fluctuation of physical conditions in earth's atmosphere
frequent absorption of star light by their own atmosphere
- 16. Multiple Choice
Which light is easily scattered
Longer wavelength light
Shorter wavelength light
white light
None of the above
- 17. Multiple Choice
Which of the following phenomena of light are involved in the formation of Rainbow
Reflection, refraction and dispersion
Refraction, dispersion and scattering
Refraction, dispersion and internal reflection
Dispersion, scattering and Refraction
- 18. Multiple Choice
When light rays from stars enter into earth's atmosphere, it travels from
rarer to denser medium
denser to rarer medium
rarer medium to vacuum
denser medium to vacuum
- 19. Multiple Choice
The colored light that refracts most while passing through a prism is
Red
Blue
Violet
Yellow
- 20. Multiple Choice
Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
Rainbow
Advanced sunrise and delayed sunset
Stars seem higher than they actually are
Twinkling of stars
- 21. Multiple Choice
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
Total internal reflection of light
Dispersion of light
Scattering of light
Reflection of light from the earth
- 22. Multiple Choice
When white light enters a prism, it gets split into its constituent colours. This is due to
Scattering of light
each colour has same velocity in the prism
different refractive index for different wavelength of each colour
prism material has high density
- 23. Multiple Choice
At noon the sun appears white as
blue colour is scattered the most
red colour is scattered the most
light is least scattered
all the colours of the white light are scattered away
- 24. Multiple Choice
Scattering of light by colloidal solution is known as
Scattering
Dispersion
Refraction
Tyndall effect
- 25. Multiple Choice
The __ colour is at the top and ____ colour is at the bottom of spectrum.
Red, Blue
Blue, Red
Violet, red
Red, Violet
- 26. Multiple Choice
The angle at which the ray gets deviated is called
Angle emergence
Angle of deviation
refracted angle
Angle of dispersion
- 27. Multiple Choice
Assertion: Planets do not twinkle
Reason: Light rays do not come from planet
Assertion and reason are false
Assertion and reason are true. Reason is the correct explanation of Assertion
Assertion is false, but reason is true
Assertion is true, but reason is false
- 28. Multiple Choice
Which Of The Following Statement Is Correct Regarding The Propagation Of Light Of Different Colours Of Light In Air?
Red light moves fastest
Yellow lights moves with the mean speed as that of the red and the violet light
Blue light moves faster than green light
All the colours of the white light move with the same speed
- 29. Multiple Choice
Read The Following Sentences Carefully, And Choose The Incorrect One:
In refraction through a glass prism, the emergent ray is parallel to the incident ray
When a ray of light passes through a prism, it bends towards the thicker part of the prism
The angle between incident ray and emergent ray is called “angle of deviation”
None of the above
- 30. Multiple Choice
Meera Is Doing Her Homework Which Is Given By His Teacher. Would You Help Her To Choose The Incorrect Sentences?
The violet colour has the minimum speed in glass prism, so the violet colour is deviated the maximum
The seven colours of the spectrum can be denoted by the word VIBGOYR
The seven colours of spectrum differ only in their frequencies
The red colour has the maximum speed in glass prism, so the red colour is deviated the least
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