Co-efficient of Performance (COP) of a refrigerator is the ratio of the Higher to lower temperature Refrigeration obtained to the work required Lower to higher temperature Work required to refrigeration obtained TRUE ANSWER : ? YOUR ANSWER : ?
If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law. Hess's None of these Kirchoff's Lavoisier and Laplace TRUE ANSWER : ? YOUR ANSWER : ?
Work done in case of free expansion is None of these Zero Negative Indeterminate TRUE ANSWER : ? YOUR ANSWER : ?
Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will Decrease Increase Remain unchanged First fall and then rise TRUE ANSWER : ? YOUR ANSWER : ?
The absolute entropy for all crystalline substances at absolute zero temperature is Indeterminate More than zero Zero Negative TRUE ANSWER : ? YOUR ANSWER : ?
Joule-Thomson co-efficient for a perfect gas is Negative None of these Positive Zero TRUE ANSWER : ? YOUR ANSWER : ?
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect? Vapor compression cycle using expansion valve Vapor compression cycle using expansion engine Air refrigeration cycle Carnot refrigeration cycle TRUE ANSWER : ? YOUR ANSWER : ?
Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole . °K 50 100 ∞ TRUE ANSWER : ? YOUR ANSWER : ?
What is the degree of freedom for two mis-cible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope? 2 1 3 TRUE ANSWER : ? YOUR ANSWER : ?
The total change in the enthalpy of a system is independent of the None of these Pressure and temperature State of combination and aggregation in the beginning and at the end of the reaction Number of intermediate chemical reactions involved TRUE ANSWER : ? YOUR ANSWER : ?