On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will____________________?

Related Mcqs:

1. Critical temperature is defined as the temperature above which a gas will____________________?

   A. Not liquify (barring exceptions)
   B. Immediately liquify
   C. Never liquify however high the pressure may be
   D. None of these

2. The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is___________________?

   A. Doubled
   B. Halved
   C. Trebled
   D. Unpredictable

3. A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will____________________?

   A. Increase
   B. Decrease
   C. Remain unaffected
   D. May increase or decrease; depends on the thickness of each layer

4. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will_________________?

   A. Increase
   B. Decrease
   C. Remain unchanged
   D. First fall and then rise

5. At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?

   A. 6
   B. 8
   C. 10
   D. 12

6. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?

   A. PvB
   B. xB.PvB
   C. (Patm – Pvw)xB
   D. xB.Patm

7. The viscosity of water at room temperature may be around one ___________________?

   A. Centipoise
   B. Poise
   C. Stoke
   D. Both B. & C.

8. Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?

   A. 0
   B. ∞
   C. +ve
   D. -ve

9. Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?

   A. A homogeneous solution (say of phenol water) is formed
   B. Mutual solubility of the two liquids shows a decreasing trend
   C. Two liquids are completely separated into two layers
   D. None of these

10. Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?

    A. Work required to refrigeration obtained
    B. Refrigeration obtained to the work required
    C. Lower to higher temperature
    D. Higher to lower temperature