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5 questions · 2004 · answers as per the UPSC key

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UPSC 2004 · Q72 · Science & Technology › Physics · Save

Assertion (A): In our houses, the current in AC electricity line changes direction 60 times per second.

Reason (R): The frequency of alternating voltage supplied is 60 hertz.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually 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: (a) Both A and R are individually true and R is the correct explanation of A
UPSC 2004 · Q106 · Science & Technology › Physics · Save

A car is running on a road at a uniform speed of 60 km/hr. The net resultant force on the car is

(a) Driving force in the direction of car’s motion
(b) Resistance force opposite to the direction of car’s motion
(c) An inclined force
(d) Equal to zero
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Answer: (d) Equal to zero
UPSC 2004 · Q125 · Science & Technology › Physics · Save

A spherical body moves with a uniform angular velocity ω around a circular path of radius r.

Which one of the following statements is correct?

(a) The body has no acceleration
(b) The body has a radial acceleration ω²r directed towards the centre of the path
(c) The body has a radial acceleration 2/5 ω²r directed away from the centre of the path
(d) The body has an acceleration ω²r tangential to its path
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Answer: (b) The body has a radial acceleration ω²r directed towards the centre of the path
UPSC 2004 · Q128 · Science & Technology › Physics · Save

A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to

(a) 9.85 N
(b) 9.8/10 N
(c) 9.8/2 N
(d) zero
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Answer: (d) zero
UPSC 2004 · Q150 · Science & Technology › Physics · Save

A person stands at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room, while plane. The path traced by a person standing at the middle point of the slipping ladder is

(a) A straight line
(b) An elliptical path
(c) A circular path
(d) A parabolic path
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Answer: (c) A circular path