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Q:

Which of the following does NOT contribute to sparkling of diamonds?

A) Total Internal Reflection B) High Refractive Index of Diamonds
C) Dispersion D) Low Refractive Index of Diamonds
 
Answer & Explanation Answer: D) Low Refractive Index of Diamonds

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Q:

_______________ states that the ratio of the potential difference across a conductor to the current flowing through it, is a constant, provided that its physical conditions, such as temperature, remain constant.

A) Lenz's Law B) Hooke's Law
C) Ohm's Law D) The coulomb's law
 
Answer & Explanation Answer: C) Ohm's Law

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Q:

A lens has a power +2.0 D. The type of lens and its focal length will be

A) Concave, -0.5 m B) Convex, 0.5 m
C) Concave, 0.5 m D) Convex, -0.5 m
 
Answer & Explanation Answer: B) Convex, 0.5 m

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Q:

The theory behind stars twinkling is that

A) The refractive index of the different layers of earth's atmosphere changes continuously, consequently the position of the star's image changes with time B) The intensity of light emitted by them changes with time
C) The light from the star is scattered by the dust particles and air molecules in the earth's atmosphere D) The distance of the stars from the earth changes with time
 
Answer & Explanation Answer: A) The refractive index of the different layers of earth's atmosphere changes continuously, consequently the position of the star's image changes with time

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Q:

Which of the following is NOT an example of potential energy?

A) Running water B) Water stored in a dam
C) A raised hammer D) A compressed spring
 
Answer & Explanation Answer: A) Running water

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Q:

Knife is an example for

A) Lever B) Wedge
C) Inclined plane D) Pulley
 
Answer & Explanation Answer: B) Wedge

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Q:

If the velocity of a body becomes two times its initial velocity, its kinetic energy becomes n times its initial kinetic energy. What is the value of n?

A) 4 B) 6
C) 1/2 D) 3
 
Answer & Explanation Answer: A) 4

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Q:

Mechanical energy is the sum of

A) kinetic energy + heat energy B) kinetic energy + potential energy
C) potential energy + heat energy D) chemical energy + electrical energy
 
Answer & Explanation Answer: B) kinetic energy + potential energy

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