Physics
Water drops cannot stick to the oily surface due to

Surface tension
Water is lighter than oil
Cannot mix each other
Lack of adhesive force

ANSWER DOWNLOAD EXAMIANS APP

Physics
Planets do not twinkle because

They emit light of a constant intensity
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 are very far away from the earth resulting in decrease in intensity of light

ANSWER DOWNLOAD EXAMIANS APP

Physics
A dynamo is a device which

Creates electrical energy
Creates mechanical energy
Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy

ANSWER DOWNLOAD EXAMIANS APP