Melting of wax is accompanied with ______________ in entropy?
(A) Increase
(B) Decrease
(C) No change
(D) None of these
Standard temperature and pressure (S.T.P.) is__________________?
(A) 0°C and 750 mm Hg
(B) 15°C and 750 mm Hg
(C) 0°C and 1 kgf/cm2
(D) 15°C and 1 kgf/cm2
Enthalpy of a gas depends upon its___________________?
(A) Temperature
(B) Mass
(C) Volume
(D) Pressure
An isolated system can exchange ______________ with its surroundings?
(A) Matter
(B) Energy
(C) Neither matter nor energy
(D) Both matter and energy
Kopp’s rule is used to calculate the heat capacity of___________________?
(A) Solids
(B) Liquids
(C) Gases
(D) All (A),
Air-refrigeration cycle________________?
(A) Is the most efficient of all refrigeration cycles
(B) Has very low efficiency
(C) Requires relatively large quantities of air to achieve a significant amount of refrigeration
(D) Both
Which of the following is not an extensive property ?
(A) Free energy
(B) Entropy
(C) Refractive index
(D) None of these
Refrigerants commonly used for domestic refrigerators are_________________?
(A) Ethyl chloride or methyl chloride
(B) Freon-12
(C) Propane
(D) NH3 or CO2
While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is _______________?
(A) Infinity
(B) Unity
(C) Constant
(D) Negative
Which one is true for a throttling process ?
(A) A gas may have more than one inversion temperatures
(B) The inversion temperature is different for different gases
(C) The inversion temperature is same for all gases
(D) The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity