Q. 1
General Knowledge
Difficulty: Medium
(1 Mark)
We see the Sun a little before it rises... and a little after it sets... This is a consequence of:
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Step-by-Step Explanation & Concept Rationale
Atmospheric refraction bends sunlight toward Earth, making the Sun visible even when it is below the physical horizon.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
The stars twinkle in the night because:
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Step-by-Step Explanation & Concept Rationale
Twinkling is caused by light passing through atmospheric layers of varying densities and refractive indices.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Rainbow is produced by tiny raindrops... as a result of:
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Step-by-Step Explanation & Concept Rationale
Sunlight undergoes refraction and dispersion inside the drop, and reflection off the internal back surface.
Q. 4
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is the combination of the three primary colour used in colour TV?
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Step-by-Step Explanation & Concept Rationale
Color televisions, computer monitors, and phone screens operate on the additive color model (specifically the RGB color model). This system creates different colors by projecting beams of light directly into your eyes. The three primary colors of light are Red, Green, and Blue. When mixed at different intensities, they can replicate virtually any color perceivable by the human eye (for example, mixing red and green light produces yellow light)
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