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Physics

Physics
In the absence of ozone layer, which rays will enter into atmosphere?

X-rays
Visible
Infrared
Ultraviolet

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Physics
For which of the following substances, the resistance decreases with increase in temperature?

Pure silicon
Nichrome
Platinum
Copper

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Physics
Which of the following is a non renewable source of energy ?

Coal
Solar
Wind
Biogas

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Physics
The propagation of sound waves in a gas involves

Adiabatic compression and rarefaction
Isothermal compression and rarefaction
Isochoric compression and rarefaction
Isobaric compression and rarefaction

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Physics
Energy per unit volume is dimensionally equal to

Pressure
Density
Force
Work

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Physics
When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

Doppler effect
Beats
Echo
Resonance

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