Physics Questions

Q:

Fuse wire is made of an alloy of

A) Tin and Lead B) Tin and Copper
C) Lead and Copper D) Copper and Silver
 
Answer & Explanation Answer: A) Tin and Lead

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Q:

If a body takes 't' seconds to go once round the circular path of radius 'r', the velocity 'v' is given by

A) v=t2πr B) v=2πrt
C) v=2πr2t D) v=πr2t
 
Answer & Explanation Answer: B) v=2πrt

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Q:

Which one of the following takes place during a nuclear fusion?

A) a heavy nucleus bombarded by neutrons breaks up B) a heavy nucleus breaks up spontaneously
C) two light nuclei combine to form a heavy nucleus D) a light nucleus breaks up spontaneously
 
Answer & Explanation Answer: C) two light nuclei combine to form a heavy nucleus

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Q:

Who first determined the value of G (gravitational constant)?

A) Lord Cavendish B) R.R Heyl
C) Boyle D) Poynting
 
Answer & Explanation Answer: A) Lord Cavendish

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Q:

Sextant is an instrument used in which of the following ?

A) Gynaecology B) Navigation
C) Birth control D) Medical treatment
 
Answer & Explanation Answer: B) Navigation

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Q:

When body is accelerated--

A) Its velocity never changes. B) Its speed will always change.
C) Its direction always changes. D) Its speed may or may not change.
 
Answer & Explanation Answer: D) Its speed may or may not change.

Explanation:

Uniform circular motion, that is constant speed along a circular path, is an example of a body experiencing acceleration resulting in velocity of a constant magnitude but the change of direction

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Q:

One Gigabyte = ? (in decimal value)

A) 1000 bytes B) 10002 bytes
C) 10003 bytes D) 10004 bytes
 
Answer & Explanation Answer: C) 10003 bytes

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Q:

Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25 cm from the optical centre?

A) 1 diopters B) -9 diopters
C) 9 diopters D) -1 diopters
 
Answer & Explanation Answer: C) 9 diopters

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