Q1: Which of the following is not a unit of pressure ?

ANS:C - Parsec

Parsec is not a unit of pressure; it's a unit of astronomical distance. It stands for "parallax-second" and is used to measure astronomical distances on a large scale, typically between stars and galaxies. The other options mentioned—Torr, Newton/m², Ata, bar, and pascal—are all units of pressure. Torr is a unit of pressure commonly used in vacuum measurements, Newton/m² (also known as pascal) is the SI unit of pressure, Ata is atmosphere absolute, and bar is a commonly used unit of pressure in various industries.