What is the motto incorporated under India's National

Which Instrument is used to measure depth of ocean?

 Photovoltaic cells are: 

The hair of shaving brush clings together when removed from water due to –

Why does a solid chunk of iron float in mercury but sink in water?

Panchayat was added to our constitution through which amendment? 

What term describes the resistance of an object to changes in its state of motion or rest?

The method of transfer of heat in liquid is

Among the following, which has the lowest density?

Which atmospheric layer contains ozone layer?

As an air bubble ascends from the bottom of a lake to the surface, what happens to its size?