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Q:

The side mirrors of vehicles are of which type of mirrors?

A) Convex B) Concave
C) Plane D) Inverted
 
Answer & Explanation Answer: A) Convex

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Q:

Propagation of sound can be visualised as propagation of _____________ variations in the medium.

A) energy B) power
C) force D) pressure
 
Answer & Explanation Answer: D) pressure

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Q:

If a ball is thrown up, which of the following does not change?

A) Acceleration B) Speed
C) Potential energy D) Distance
 
Answer & Explanation Answer: A) Acceleration

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Q:

A force of 200 N displaces a body by 4 m, calculate the work done (in J).

A) 40 B) 500
C) 80 D) 800
 
Answer & Explanation Answer: D) 800

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Q:

A sound of single frequency is called a

A) Hertz B) Tone
C) Pitch D) Note
 
Answer & Explanation Answer: B) Tone

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Q:

One Gigabyte = ? (in decimal value)

A) 1000 bytes B) 10002 bytes
C) 10003 bytes D) 10004 bytes
 
Answer & Explanation Answer: C) 10003 bytes

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Q:

In total internal reflection, the light travel from

A) rarer to denser medium and it occurs with no loss of intensity B) denser to rarer medium and it occurs with no loss of intensity
C) rarer to denser medium and it occurs with loss of intensity D) denser to rarer medium and it occurs with loss of intensity
 
Answer & Explanation Answer: B) denser to rarer medium and it occurs with no loss of intensity

Explanation:

According to wave theories, for Total internal reflection tohappen: Light must travel from denser medium to rarer medium. Angle of incidence should be greater than critical angle. As in case of TIR, the image is perfectly clear, it implies that there has been no loss of intensity.

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Q:

The coil wire in the electric room heater or electric cooking heater is called __________.

A) Circuit B) Element
C) Filament D) Cells
 
Answer & Explanation Answer: B) Element

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