Which is an example of closed system ?

Related Mcqs:

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

   A. Increase
   B. Decrease
   C. Remain same
   D. Increase in summer and will decrease in winter

2. A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system________________?

   A. its internal energy (U) decreases and its entropy (S) increases
   B. U and S both decreases
   C. U decreases but S is constant
   D. U is constant but S decreases

3. 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

4. The specific heat of saturated water vapour at 100°C is__________________?

   A. ∞
   B. -ve
   C. 0
   D. +ve

5. Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?

   A. Freon
   B. Liquid sulphur dioxide
   C. Methyl chloride
   D. Ammonia

6. The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.°K are________________?

   A. 5 & 3
   B. 3.987 & 1.987
   C. 1.987 & 0.66
   D. 0.66 & 1.987

7. Joule-Thomson Co-efficient at any point on the inversion curve is___________________?

   A. ∞
   B. +ve
   C. 0
   D. -ve

8. In an irreversible process________________?

   A. Tds = dE – dW = 0
   B. dE – dW – Tds = 0
   C. Tds – dE + dW < 0
   D. Tds – dT + dW < 0

9. ________________ decreases during adiabatic throttling of a perfect gas?

   A. Entropy
   B. Temperature
   C. Enthalpy
   D. Pressure

10. What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ?

    A. 2
    B. 0
    C. 3
    D. 1