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5 questions · 2007 · answers as per the UPSC key

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UPSC 2007 · Q106 · Science & Technology › Physics · Save

Consider the following statements :

  1. If magenta and yellow coloured circles intersect, the intersected area will have red colour.
  2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
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Answer: (c) Both 1 and 2
UPSC 2007 · Q107 · Science & Technology › Physics · Save

Consider the following statements:

  1. A flute of smaller length gives waves of lower frequency.
  2. Sound travels in rocks in the form of longitudinal elastic waves only.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
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Answer: (d) Neither 1 nor 2
UPSC 2007 · Q108 · Science & Technology › Physics · Save

Four wires of the same material and of the dimensions given below are stretched by equal loads separately. Which one of them will be elongated the maximum?

(a) Wire of 1 m length and 2 mm diameter
(b) Wire of 2 m length and 2 mm diameter
(c) Wire of 3 m length and 1.5 mm diameter
(d) Wire of 1 m length and 1 mm diameter
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Answer: (c) Wire of 3 m length and 1.5 mm diameter
UPSC 2007 · Q110 · Science & Technology › Physics · Save

Assertion (A): A jet aircraft moving at Mach number equal to 1 travels faster at an altitude of 15 km than while moving at Mach number equal to 1 near sea level.

Reason (R): The velocity of sound depends on the temperature of the surrounding medium.

(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
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Answer: (d) A is false but R is true
UPSC 2007 · Q120 · Science & Technology › Physics · Save

Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first?

(a) Vessel B
(b) All the vessels A, B and C will be emptied simultaneously
(c) Vessel A
(d) Vessel C
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Answer: (d) Vessel C