Thermodynamics

Question 1

Which law is the basis for the manufacture of thermometers?
a. Boyle’s Law c. Zeroth Law of Thermodynamics
b. Raoult’s Law d. Carnot’s Principle

Answer 1

Zeroth Law of Thermodynamics

Question 2

Energy is added to the water as work but is extracted from the water as heat was performed by
a. Van ness c. Joule
b. Fitzer d. Smith

Answer 2

Joule

Question 3

These properties depend on the current state of the system and not on how the system reaches that state.
a. path functions c. excess property
b. state functions d. all of these

Answer 3

State functions

Question 4

Which of the following statement is correct?
a. The standard heat of formation of an element is negative.
b. Since △H = △U + △PV and can never be equal to △U.
c. Q and W are state functions.
d. Q + W is a state function.

Answer 4

d. Q + W is a state function.

Question 5

The amount of heat absorbed when CO2 gas reacts with a solid CaO to form solid CaCO3 is measured in a bomb calorimeter at constant volume. The data obtained give a direct measure of
a. △U c. △H
b. V△P d. Cp

Answer 5

a. △U

Question 6

For a constant pressure reversible process, the enthalpy (∆H) change of the system is
a.CvdT
b. ∫CpdT
c. CpdT
d. ∫CvdT

Answer 6

b. ∫CpdT

Question 7

Cv is given by
a. (∂U/ ∂T)v
b. (∂U/∂P)v
c. (∂U/∂V)T
d. (∂V/ ∂T)P

Answer 7

a. (∂U/ ∂T)v

Question 8

Equation which relates pressure, volume, and temperature of a gas is called
a. Equation of state
b. ideal gas equation
c. Gibbs Duhem equation
d. all of these

Answer 8

a. Equation of state

Question 9

The equation, PV = nRT is best obeyed by gases at
a. low pressure and high temperature
b. high pressure and low temperature
c. low pressure and low temperature
d. high pressure and high temperature

Answer 9

a. low pressure and high temperature

Question 10

Compressibility factor of a gas is
a. not a function of pressure
b. not a function of its nature
c. not a function of its temperature
d. unity, if it follows PV = nRT

Answer 10

d. unity, if it follows PV = nRT

Question 11

Cp–Cv=R is valid for
a. ideal gases
b. all gases
c. gases at very high pressure
d. gases at a very low temperature

Answer 11

a. ideal gases

Question 12

For monoatomic gases, Cp / Cv equals
a. 1.0 c. 1.3
b. 1.4 d. 1.67

Answer 12

1.67

Question 13

Isobaric process means a constant
a. temperature process c. pressure process
b. volume process d. entropy process

Answer 13

c. pressure process

Question 14

For an isothermal process the internal energy of a gas
a. increases
b. decreases
c. remains unchanged
d. data insufficient can’t be predicted

Answer 14

c. remains unchanged

Question 15

In an adiabatic process
a. heat transfer is zero
b. temperature change is zero
c. work done is a path function
d. enthalpy remains constant

Answer 15

a. heat transfer is zero

Question 16

From PVn=C,when n=0,the process is
a. isochoric c. polytropic
b. isothermal d. isobaric

Answer 16

Isobaric

Question 17

From PVn = C, the process is isochoric if n equals
a.0 c.1
b. δ d. ∞

Answer 17

d. ∞

Question 18

A solid is transformed into vapor without going through the liquid phase at
a. below triple point
b. boiling point
c. triple point
d. always

Answer 18

Below triple point or at triple point

Question 19

Work output of turbine is __ the work input to the pump
a. less than
b. equal to
c. greater than
d. less than or greater than

Answer 19

c. greater than

Question 20

The efficiency of Carnot cycle is ___ the efficiency of Rankine cycle.
a. less than c. equal to
b. greater than d. less than or greater than

Answer 20

b. greater than

Question 21

The losses in condenser are ___.
a. small
b. always constant
c. large
d. none of these

Answer 21

a. small