Physics
A cycle tyre bursts suddenly. This represents an :

Isothermal process
Isochoric process
Isoboric process
Adiabatic process

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Physics
A drop of liquid assumes spherical shape because:

Intermolecular forces are strong in liquids
Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume

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Physics
Planets do not twinkle because

They are very far away from the earth resulting in decrease in intensity of light
Their distance from the earth does not change with time
They are nearer to earth and hence we receive a greater amount of light.
They emit light of a constant intensity

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