Physics
What is unit of Viscosity ?

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

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

more surface area of the barrel is in contact with the road when it is pulled
coal tar is a liquid and it flows in the barrel when it is rolled
the rolling friction is much less than the sliding friction
the full weight of the barrel comes into play when it is pulled

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Physics
What is a neuron ?

The anti-particle of neutron
Particle released during radioactivity
Basic unit of energy
Basic unit of nervous system

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