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 Physics Questions

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Q:

A current I flows through a resistor. A source maintains a potential difference of V across the resistor. The energy supplied by the source in time t is 

A) V I t2 B) V I
C) V I t D) V I/t
 
Answer & Explanation Answer: C) V I t

Explanation:
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Q:

A wave with high amplitude have

A) high pitch B) low energy
C) high energy D) low pitch
 
Answer & Explanation Answer: C) high energy

Explanation:

The amplitude of a wave is a measure of the displacement of the wave from its rest position i.e, half the distance from its highest point to its lowest point.


Amplitude is proportional to the energy of a wave.

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Q:

The SI unit of intensity of sound is ______.

A) watt per square meter B) joule per square meter
C) newton per square meter D) tesla per square meter
 
Answer & Explanation Answer: A) watt per square meter

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Q:

Which one among the following components is used as an amplifying device?

A) Transformer B) Diode
C) Capacitor D) Transistor
 
Answer & Explanation Answer: D) Transistor

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1 1301
Q:

Calculate the pressure (in Pa) if a thrust of 600 N is applied to an area of 24 sq.m.

A) 144 B) 50
C) 25 D) 72
 
Answer & Explanation Answer: C) 25

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Q:

Mohan, having a mass of 40 kg, runs up a staircase of 50 steps in 10 s. If the height of each step is 15 cm, then what is his power?

A) 300 W B) 200 W
C) 100 W D) 400 W
 
Answer & Explanation Answer: A) 300 W

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Q:

The volume of air delivered by the compressor is called

A) Compressor capacity B) Swept volume
C) Free air delivery D) None of these
 
Answer & Explanation Answer: A) Compressor capacity

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0 1297
Q:

Electric Motor converts _____ energy to mechanical energy

A) sound B) mechanical
C) chemical D) electrical
 
Answer & Explanation Answer: D) electrical

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