Physics
Oil raise up the wick in a lamp. The principle involves

the liquid state of oil
capillary action phenomenon
the diffusion of oil through the wick
volatility of oil

ANSWER DOWNLOAD EXAMIANS APP

Physics
A drop of liquid assumes spherical shape because:

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

ANSWER DOWNLOAD EXAMIANS APP