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Physics

Physics
Sound of frequency below 20 Hz is called

infrasonic
ultrasonic
audio sounds
supersonics

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Physics
Tungsten is used for the manufacture of the filament of an electric bulb, because

It is a good conductor
It is economical
It has a very high melting point
It is malleable

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Physics
Loudness of sound depends on

Wavelength
Frequency
Amplitude
Pitch

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Physics
Which of the following represents a relation for ''heat lost = heat gained'?

Principle of thermal equilibrium
Principle of colors
Principle of calorimetry
Principle of vaporization

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Physics
When pressure is increased the melting point of ice

Increases
Depends on the impurities in the ice
Decreases
Does not change

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Physics
Electricity is transmitted over long distances

It is safer
It is fast
It is cheaper
There is less wastage of energy

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