An underground stem of potato is known

‘Lubb-dupp’ sound is produced due to the action of

The group velocity of matter waves associated with a moving particle is:

Which of the following materials exhibits piezoelectric effect?

Which physical quantity has unit “Joule/second”?  

Newton’s second law of motion primarily explains which of the following?

In an ideal gas, the relationship between pressure P, volume V, and temperature T is given by:?       

A decibel is –

The energy that can harness heat stored below the earth's surface is known as –