Physics
What is unit of Viscosity ?

Joule per kilogram per Kelvin
Watt per meter per degree celcius
Newton second per square meter
Coulomb

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Physics
'Mirage' is an example of

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

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Air-gaps are necessary for bearing the weight of running train
Accidents due to contraction in winter can be avoided
Accidents due to expansion in summer can be avoided
Steel can be saved

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