Questions

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:

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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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:

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:

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 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:

An object of 5.0 kg is raised through a height of 2.0m. The work done in the process is

A) 49 J B) 10 J
C) 19.6 J D) 98 J
 
Answer & Explanation Answer: D) 98 J

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Q:

The energy released at the end of digestion is in the form of

A) thermal energy B) electric energy
C) kinetic energy D) chemical energy
 
Answer & Explanation Answer: D) chemical energy

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