Physics
If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

LUV < lVIS < lIR
LUV > lVIS > lIR
LUV < lIR < lVIS
LUV > lIR > lVIS

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor like copper with sharp-pointed edges
Can be of any shape
Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod

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Physics
The wall of a dam is broader at the base

To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth
Because streamlining is required
To withstand pressure that increases in a horizontal plane

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Physics
The blue colour of sky is due to

Scattering of longer wavelengths of sunlight in the atmosphere
Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Refraction of sunlight

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