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11 questions · 1996 · answers as per the UPSC key

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All years of Physics · Full UPSC 1996 paper
UPSC 1996 · Q114 · Science & Technology › Physics · Save

I. ‘A’ stood first in the race. II. ‘C’ led all the way.

III. ‘D’ ran faster than others in the later part of the race. Of these statements

(a) I and III are false and II is true
(b) I and II are false and III is true
(c) I and III are true and II is false
(d) I is true and II and III are false
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Answer: (b) I and II are false and III is true
UPSC 1996 · Q115 · Science & Technology › Physics · Save

When an air bubble at the bottom of a lake rises to the top, it will

(a) increase in size
(b) decrease in size
(c) maintain its size
(d) flatten into a disk-like shape
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Answer: (a) increase in size
UPSC 1996 · Q116 · Science & Technology › Physics · Save

When a mirror is rotated by an angle of θ, the reflected ray will rotate by

(a) 0°
(b) θ / 2
(c) θ
(d) 2θ
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Answer: (d) 2θ
UPSC 1996 · Q117 · Science & Technology › Physics · Save

A truck, a car and a motor cycle have equal kinetic energies. If equal stopping ...

(a) x > y > z
(b) x < y < z
(c) x = y = z
(d) x 4y 8z
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Answer: (a) x > y > z
UPSC 1996 · Q118 · Science & Technology › Physics · Save

A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be

(a) as shown in figure (a)
(b) as shown in figure (b)
(c) as shown in figure (c)
(d) as shown in figure (d)
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Answer: (d) as shown in figure (d)
This question uses a table or figure from the original paper that is not reproduced here.
UPSC 1996 · Q119 · Science & Technology › Physics · Save

The variation of displacement (d) with time (t) in the case of a particle falling freely under gravity from rest is correctly represented by which of the following graphs?

(a) graph (a)
(b) graph (b)
(c) graph (c)
(d) graph (d)
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Answer: (a) graph (a)
This question uses a table or figure from the original paper that is not reproduced here.
UPSC 1996 · Q120 · Science & Technology › Physics · Save

Total internal reflection can take place when light travels from

(a) diamond to glass
(b) water to glass
(c) air to water
(d) air to glass
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Answer: (a) diamond to glass
UPSC 1996 · Q121 · Science & Technology › Physics · Save

Assertion (A): Transformer is useful for stepping up or stepping down voltages.

Reason (R): Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct?

(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 a 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: (c) A is true but R is false.
UPSC 1996 · Q122 · Science & Technology › Physics · Save

Domestic electrical wiring is basically a

(a) series connection
(b) parallel connection
(c) combination of series and parallel connections
(d) series connection within each room and parallel connection elsewhere
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Answer: (b) parallel connection
UPSC 1996 · Q124 · Science & Technology › Physics · Save

A simple machine helps a person doing

(a) less work.
(b) the same amount of work with lesser force.
(c) the same amount of work.
(d) the same amount of work much faster.
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Answer: (b) the same amount of work with lesser force.
UPSC 1996 · Q127 · Science & Technology › Physics · Save

The alpha particle carries two positive charges. Its mass is very nearly equal to that of

(a) two protons
(b) an atom of helium
(c) sum of masses of two positrons and two neutrons
(d) two positrons as each positron carries a single positive charge
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Answer: (b) an atom of helium