Q1: Specific __________ is a dimensionless quantity.

ANS:D - none of these

"None of these" simply indicates that none of the options provided in the question are correct or applicable to the statement. In the context of the statement "Specific ________ is a dimensionless quantity," if "none of these" is chosen, it means that specific heat, humidity, and weight are all not dimensionless quantities. Let's briefly explain why each option is not dimensionless:

1. Specific heat: As mentioned earlier, specific heat is indeed a dimensionless quantity. However, if "none of these" is chosen, it implies that specific heat is not dimensionless, which contradicts the correct explanation provided.
2. Humidity: Humidity refers to the amount of water vapor present in the air or a gas. It is typically expressed as a ratio of the partial pressure of water vapor to the saturation vapor pressure at a given temperature. Humidity is not dimensionless; it is usually expressed in units such as grams per cubic meter (g/m³) or in relative humidity, which is a percentage.
3. Weight: Weight is a measure of the force exerted on an object due to gravity. It is typically expressed in units such as newtons (N) or pounds-force (lbf). Weight is not dimensionless because it involves mass (kilograms or pounds) multiplied by the acceleration due to gravity (m/s² or ft/s²), resulting in units of force.