UPSC 1997 › Science & Technology › Physics
6 questions · 1997 · answers as per the UPSC key
UPSC 1997 · Q106 · Science & Technology › Physics · Save
The tendency of a liquid drop to contract and occupy minimum area is due to
(a) viscosity
(b) surface tension
(c) density
(d) vapour pressure
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Answer: (b) surface tension
UPSC 1997 · Q107 · Science & Technology › Physics · Save
Which one of the following is a vector quantity?
(a) Momentum
(b) Pressure
(c) Energy
(d) Work
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Answer: (a) Momentum
UPSC 1997 · Q109 · Science & Technology › Physics · Save
Which one of the following is a valid conclusion?
(a) The larger the initial inclination, the longer the throw
(b) The larger the height reached, the longer the throw
(c) The larger the height reached, the shorter the throw
(d) The larger the initial inclination, the greater the height reached
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Answer: (c) The larger the height reached, the shorter the throw
UPSC 1997 · Q110 · Science & Technology › Physics · Save
The working principle of a washing machine is
(a) centrifugation
(b) dialysis
(c) reverse osmosis
(d) diffusion
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Answer: (a) centrifugation
UPSC 1997 · Q134 · Science & Technology › Physics · Save
A smooth inclined plane is inclined at an angle θ with the horizontal as shown in the figure. A body starts from rest and slides down the inclined surface. The time taken by the body to reach the bottom is
(a) (2h / g)
(b) (2l / g)
(c) (2l / (g sin θ))
(d) (1/ sin θ) (h / 2g)
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Answer: (c) (2l / (g sin θ))
This question uses a table or figure from the original paper that is not reproduced here.
UPSC 1997 · Q144 · Science & Technology › Physics · Save
A girl is swinging on a swing in sitting position. When the same girl stands up, the period of swing will
(a) be shorter
(b) be longer
(c) depend on the height of the girl
(d) not change
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Answer: (a) be shorter