Question : Which of the following is not caused by atmospheric refraction of light?
Option 1: The Sun appears red at sunset.
Option 2: Twinkling of stars at night
Option 3: Sun appears higher in the sky than it is
Option 4: Sun becomes visible two or three minutes before actual sunrise.
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Correct Answer: The Sun appears red at sunset.
Solution : The correct answer is the Sun appearing red at sunset.
The Sun appears red at sunset because of the scattering phenomenon, and all the other options are examples of atmospheric refraction. The refraction of light induced by the earth's atmosphere is known as atmospheric refraction and occurs because different layers of the atmosphere vary in densities.
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Question : A star appears twinkling in the sky because of :
Option 1: scattering of light by atmosphere
Option 2: reflection of light by atmosphere
Option 3: refraction of light by atmosphere
Option 4: diffraction of light by atmosphere
Question : The redness in the atmosphere at Sunrise and Sunset is due to:
Option 1: Refraction of light
Option 2: Reflection of light
Option 3: Dispersion of light
Option 4: Scattering of light
Question : In a filament-type light bulb, most of the electric power consumed appears as
Option 1: visible light
Option 2: infrared rays
Option 3: ultraviolet rays
Option 4: fluorescent light
Question : The distance of the Sun from the Earth is about ______ light minutes.
Option 1: 6
Option 2: 4.3
Option 3: 12
Option 4: 8
Question : Which of these travels in glass with minimum velocity?
Option 1: Red light
Option 2: Violet light
Option 3: Green light
Option 4: Yellow light
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