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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:

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:

Two identical resistors of 20 ohm each are connected in parallel. This combination, in turn, is connected to a 10 ohm resister. The equivalent resistance of the combination will be

A) 30 ohm B) 10 ohm
C) 5 ohm D) 20 ohm
 
Answer & Explanation Answer: A) 30 ohm

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Q:

According to Ohm's law, if current (I) increase and potential difference (V) remains constant, then

A) resistance unchanged B) resistance decreases
C) potential difference decreases D) resistance increases
 
Answer & Explanation Answer: B) resistance decreases

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Q:

What of the given below devices converts chemical energy to electrical energy?

A) Transformer B) Battery
C) Electric Generator D) Wheel
 
Answer & Explanation Answer: B) Battery

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Q:

Which of the following has the same unit as energy?

A) Work B) Power
C) Density D) Force
 
Answer & Explanation Answer: A) Work

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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 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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