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 Physics Questions

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Q:

The SI unit of weight is a

A) Kg B) Newton
C) Gram D) Dyne
 
Answer & Explanation Answer: B) Newton

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Q:

The diameter of the reflecting surface of a spherical mirror is called a/an

A) principal axis B) aperture
C) focus D) pole
 
Answer & Explanation Answer: B) aperture

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Q:

One step in the production of hydroelectric power involves _____.

A) falling water that turns a turbine  B) electric current flowing across a dam
C) hot water from under the ground D) tides that pour through a barrier dam
 
Answer & Explanation Answer: A) falling water that turns a turbine 

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Q:

What is the upward force exerted by water called?

A) Density B) Buoyant force
C) Gravitation D) Friction
 
Answer & Explanation Answer: B) Buoyant force

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Q:

The acceleration due to gravity at the surface of the earth (mass M and radius R) is proportional to ___.

A) MR B) M/R2
C) M2/R D) M/R
 
Answer & Explanation Answer: B) M/R2

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Q:

The speed of the light is maximum in

A) Air B) Vacuum
C) Water D) Glass
 
Answer & Explanation Answer: B) Vacuum

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Q:

Which of the following is NOT based on principle of relationship between volume and pressure of air?

A) Fountain pen B) Bicycle pump
C) Hand pump D) Pulley
 
Answer & Explanation Answer: D) Pulley

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Q:

An echo is returned in 3 s. What is the distance of the reflecting surface from the source, considering the speed of sound as 342 ms-1?

 

A) 513 m B) 644 m
C) 342 m D) 171 m
 
Answer & Explanation Answer: A) 513 m

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