Physics
An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

600 units
60 units
0.6 units
6 units

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Physics
The blue colour of sky is due to

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

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