Physics
Steam at 100°C causes more severe burns than water at 100°C because

Steam has latent heat of vaporisation
Water has latent heat of fusion
Water has no specific heat capacity
Steam has no specific heat capacity

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Physics
The sky appears blue because

It is actually blue
In white light, the blue component dominates
The atmosphere scatters blue colour more than the others
All colours interfere to produce blue

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Physics
'Mirage' is an example of

Refraction and total internal reflection of light
Dispersion of light only
Refraction of light only
Total internal reflection of light only

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