ANS:A - 1 torr

Let's compare 1 kgf/cm² with the given units:

1. 1 kgf/cm²:
   • This is a unit of pressure where 1 kilogram-force per square centimeter is the pressure exerted by a force of 1 kilogram-force acting on an area of 1 square centimeter.
2. 1 torr:
   • 1 torr is a unit of pressure equal to 1/760th of an atmosphere or approximately 1/760th of standard atmospheric pressure. It is used to measure very low pressures, especially in vacuum systems.
3. 1 bar:
   • 1 bar is a unit of pressure equal to 100,000 pascals or 1,000,000 dynes per square centimeter. It is commonly used in meteorology and engineering.
4. 10000 mm wc:
   • This unit stands for "millimeters of water column" and represents a pressure of 10,000 millimeters of water.
5. 100 kPa = 100,000 N/m²:
   • This represents a pressure of 100 kilopascals, which is equivalent to 100,000 newtons per square meter.

• 1 kgf/cm² is equal to 1 bar (since 1 bar = 1 kilogram-force per square centimeter).
• 1 kgf/cm² is not equal to 1 torr or 10000 mm wc.
• 1 kgf/cm² is equal to 98,066.5 pascals (since 1 kgf/cm² = 1 bar and 1 bar = 100,000 pascals).