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Physics

Physics
The energy of a photon varies directly with its

Speed
Frequency
Wave length
None of these

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Physics
Electrons carry a

Positive Charge
Negative Charge
Neutral Charge
Variable Charge

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Physics
What is the minimum distance (in metres) required to hear an echo?

10
13
21
17

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Physics
Sound is heard over longer distances on rainy days because

Sound travels faster in moist air
Moist air absorbs sound
Sound travels slowly in moist air
Moist air does not absorb sound

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Physics
The basic reason for the extraordinary sparkle of suitably cut diamond is that

It has well defined cleavage planes
It has a very high transparency
It is very hard
It has a very high refractive index

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Physics
Which of the following is the unit of perceived loudness of sound ?

Sone
Hertz
Decibel
Phon

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