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102 questions · 1995–2021 · answers as per the UPSC key · page 3 of 3

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UPSC 1995 · Q112 · Science & Technology › Physics · Save

Suppose a rocketship is receding from the earth at a speed of 2⁄10th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth?

(a) Blue
(b) Orange
(c) Yellow
(d) Yellow-orange
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Answer: (d) Yellow-orange
UPSC 1995 · Q115 · Science & Technology › Physics · Save

An air bubble in water will act like a

(a) convex mirror
(b) convex lens
(c) concave mirror
(d) concave lens
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Answer: (d) concave lens