Physics Questions

Q:

In hydel power station, the motion produced in turbines is due to

A) flow of water B) burning of coal
C) burning of diesel D) production of steam
 
Answer & Explanation Answer: A) flow of water

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Q:

During which of the following operating conditions of an automobile, carbon monoxide content in exhaust gas is maximum?

A) Acceleration B) Cruising
C) Idle running D) Deacceleration
 
Answer & Explanation Answer: C) Idle running

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Q:

The laws which govern the motion of planets are called ___________________.

A) Newton's Laws B) Kepler's Laws
C) Avogadro's laws D) De Morgan's Laws
 
Answer & Explanation Answer: B) Kepler's Laws

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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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Q:

1 kW = ?

A) 1000 W B) 10 W
C) 100 W D) 10000 W
 
Answer & Explanation Answer: A) 1000 W

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Q:

Why boiling point of water decreases at high altitudes?

A) Because of high temperature B) Because of low atmospheric pressure
C) Because of low temperature D) Because of high atmospheric pressure
 
Answer & Explanation Answer: B) Because of low atmospheric pressure

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Q:

___________________states that the induced e.m.f. is directly proportional to the rate of change of magnetic flux linkage or rate of cutting of magnetic flux
linkage.

A) Lenz's Law B) Hooke's Law
C) Ohm's Law D) Faraday's Law
 
Answer & Explanation Answer: D) Faraday's Law

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Q:

If the angle of incidence formed on a concave mirror at a point is 30 deg then the angle of reflection will be

A) 15 deg B) 30 deg
C) 60 deg D) 90 deg
 
Answer & Explanation Answer: B) 30 deg

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