Physics Questions

Instrument for measuring low temperatures is called

A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?

What is the fundamental unit of amount of a substance?

A Sonar of a ship sends sounds waves of speed 1500 m/s. These waves are reflected back by the ocean floor in 5 seconds. Find the depth (in m) of the ocean floor.

_________________ is a measure of the moisture in air.

'Gallon' is commonly used

If a body takes 't' seconds to go once round the circular path of radius 'r', the velocity 'v' is given by

The absolute refractive index of air is