Physics
A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum:

Just after it is dropped
Just before it touches the ground
When it is just on the half-way
When it touches the ground

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.
density of mercury is greater than that of water.
cohesion of water is greater than its adhesion with glass.

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not require a medium to propagate.
Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves are transverse waves
Oscillating electric field and magnetic field are perpendicular to each other.

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