Thermodynamics Test

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Thermodynamics Test - 18

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Weekly Quiz Competition

Question 1
4 / -1

The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

A
1/2

B
1/4

C
1/3

D
2/3

Solution
Question 2
4 / -1

A uniform metal rod is used as a bar pendulum. If the room temp. rises by 10ºC and coefficient of linear expansion of the metal of the rod is 2 × 10⁶ per ºC, the period of pendulum will increase by

A
1 × 10^-3%

B
–1 × 10^-3%

C
2 × 10^-3%

D
–2 × 10^-3%

Solution
Question 3
4 / -1

If the degrees of freedom of a gas molecule be f, then the ratio of two specific heats C_p/C_υ is given by

A

B

C

D

Solution
Question 4
4 / -1

A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone

A
isothermal change

B
adiabatic change

C
isobaric change

D
isochoric change.
Question 5
4 / -1

Fig. shows four PV diagrams. Which of these curves represent isothermal and adiabatic processes ?

A
C and D

B
A and C

C
A and B

D
B and D
Question 6
4 / -1

Fig. shows V‒T diagram for a gas heated at constant pressure. What happens to the mass of the gas when it goes from state 1 to state 2?

A
decreases

B
increases

C
remains constant

D
cannot say

Solution
Question 7
4 / -1

An ideal gas is taken from state A to state B following three different paths as shown in P‒V diagram, Fig. Which one of the following is true?

A
work done is max. along AB

B
work done is min. along AB

C
work done along ACB = work done along ADB

D
work done along ADB is minimum.

Solution
Question 8
4 / -1

Fig. shows a thermodynamical process on one mole of a gas. How does the work done in the process change with time?

A
decrease continuously

B
increase continuously

C
remains constant

D
first increases and then decreases.
Question 9
4 / -1

A thermodynamical system is taken from state A to state B along ACB and is brought back to A along BDA as shown in Fig. Net work done during one complete cycle is given by area

A
ACBDA

B
ACB P₂ P₁ A

C
A V₁ V₂ BDA

D
BD AP₁ P₂B
Question 10
4 / -1

What is the nature of change in internal energy in the following three hermodynamical processes shown in Fig. ?

A
∆U is + in all the three cases

B
∆U is negative in all the three cases

C
∆U is + for (a), —for (b), zero for (c)

D
∆U = 0, in all the cases.