Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. One kg of water is evaporated from 6 kg of sea water containing 4% salt. The percentage of salt in the remaining solution will be
a. 4%
b. 6%
c. 3.33%
d. 4.80%
e. 1%
Q. In case of real gases, Cp will be equal to Cv
a. Pulsejet
b. at triple point
c. at absolute zero
d. above critical temperature
e. at critical temperature
Q. If a surface is elastically hit by N balls each of mass M, moving with same velocity V, the force on the surface will be
a. 2 MNV2
b. MNV
c. Pulsejet
d. 2 MNV
e. 4 MNV
Q. Antifreeze chemicals are
a. Those which lower down the freezing points of liquids
b. Those which do not freeze at all
c. Always in liquid state even at low temperatures
d. Those which are added to refrigerants for better performance
e. Same as refrigerants
Q. A carburettor is used to supply
a. Air + lubricating oil
b. Petrol + air
c. Petrol + lubricating oil
d. Petrol + air + lubricating oil
e. Diesel + air + lubricating oil
Q. In an adiabatic compression the decrease in volume is associated with
a. Decrease in temperature and increase in pressure
b. Decrease in temperature and decrease in pressure
c. Increase in temperature and decrease in temperature
d. Increase in temperature and increase in pressure
e. None of the above
Q. A gas having adiabatic index y = 1.4 and atmic weight A will have molecular weight
a. A
c. 2A
d. Pulsejet
e. 3A
Q. Identify the incorrect statement
a. The temperature scale is independent of the properties of any substance
b. The size of a unit of temperature, the degree, has a rational interpretation
c. A region of coldest temperature, an absolute zero, is well defined
d. All of the above
e. None of the above
Q. When a bicycle pump is operated slowly the process of compression will be nearly
a. Throttling process
b. Isothermal process
c. Free compression
d. Constant volume process
e. Constant pressure process
Q. For water, boiling and melting point will concide at
a. 100? K
b. 216.73? K
c. 200? K
d. 2730.16? K
e. 0? K
Q. 1 bar pressure is nearly equal to
a. 13.4 mm Hg
b. 1 mm Hg
c. 100 mm Hg
d. 750 mm Hg
e. 735 mm Hg
Q. In a Carnot cycle the process which must be carried out at extremely slow speed is
a. adiabatic compression
b. adiabatic expansion
c. isothermal compression
d. None of the above
e. Pulsejet
Q. The general gas equation is
a. PVn = constant
b. PV = (RT)m
c. PV = constant
d. PV = mRT
e. PV = RT
Q. Heat is transferred from an insulated steam pipe to the surrounding still air by
a. Conduction
b. Radiation
c. All the above together
d. Forced convection
e. Free convection
Q. Three Carnot engines A, B and C having source temperature of 750?K, 700?K and 650?K have sink temperatures respectively 400?k, 350?k and 300?k. Which engine is the least efficient?
a. All being Carnot engine have identical efficiencies
b. Pulsejet
c. Engine B
d. Engine C
e. Engine A