Q1: Which of the following is an undesirable property of a manometric liquid ?

ANS:B - High vapour pressure.

An undesirable property of a manometric liquid would be high vapor pressure.

Explanation:

1. Manometric Liquid:
   • A manometric liquid is a liquid used in manometers for measuring pressure differences. It needs to have certain desirable properties such as high density, non-reactivity with the fluids being measured, and stability over time.
2. Undesirable Property - High Vapor Pressure:
   • High vapor pressure in a manometric liquid can lead to evaporation and loss of the liquid from the manometer over time. This can affect the accuracy and reliability of pressure measurements.
   • Manometric liquids are typically chosen for their low vapor pressure to ensure that they remain stable and do not evaporate easily under the conditions of use.
3. Other Properties:
   • Non-sticky & non-corrosive nature: Desirable properties to prevent contamination and damage to the equipment.
   • Low viscosity & surface tension: These properties are often desirable as they allow for easy flow and accurate measurement in the manometer.
   • Low coefficient of thermal expansion: This property helps maintain stability and accuracy of pressure measurements with changes in temperature.

Conclusion: