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3 questions · 2006 · answers as per the UPSC key
UPSC 2006 · Q4 · Science & Technology › Physics · Save
In which one among the following is the speed of sound maximum?
(a) Air at 0 °C
(b) Air at 100 °C
(c) Water
(d) Wood
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Answer: (d) Wood
UPSC 2006 · Q95 · Science & Technology › Physics · Save
There are 8 equidistant points A, B, C, D, E, F, G and H in the clockwise direction on the periphery of a circle. In a time-interval t, a person reaches from A to C with uniform motion while another person reaches the point E from the point B during the same time-interval with uniform motion. Both the persons move in the same direction along the circumference of the circle and start at the same instant. How much time after the start will the two persons meet each other?
(a) 4t
(b) 7t
(c) 9t
(d) Never
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Answer: (b) 7t
UPSC 2006 · Q148 · Science & Technology › Physics · Save
Which one of the following is printed on a commonly used fluorescent tube light?
(a) 220 K
(b) 273 K
(c) 6500 K
(d) 9000 K
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Answer: (c) 6500 K