Thermodynamics Test

Result

Thermodynamics Test - 27

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Weekly Quiz Competition

Question 1
4 / -1

Work done in the given P → V diagram in the cyclic process is

A
4 PV

B
3 PV

C
2 PV

D
PV/2

Solution
Question 2
4 / -1

A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as Shown in the P → V diagram. The net work done during the complete cycle is given by the area.

A
P₁ACBP₂P₁

B
ACBDA

C
ACBB¹A¹A

D
ADBB¹A¹A
Question 3
4 / -1

What is the relationship Pressure and temperature for an ideal gas under going adiabatic Change.

A
PT^γ = Const

B
PT^{-1+ γ} = Const

C
P^{1- γ}T^γ = Const

D
P^{γ - 1}T^γ = Const
Question 4
4 / -1

For adiabatic Process which one is wrong statement ?

A
dQ = 0

B
entropy is not constant

C
du = – dw

D
Q = constant
Question 5
4 / -1

Air is filled in a motor tube at 27^o C and at a Pressure of a atmosphere. The tube suddenly bursts.Then what is the temperature of air. given r of air = 1.5

A
150 K

B
150^oC

C
75 K

D
27.5^o C

Solution
Question 6
4 / -1

If v is the radio of Specific heats and R is the universal gas constant, then the molar Specific heat at constant Volume Cv is given by ............

A

B

C

D

Solution
Question 7
4 / -1

Efficiency of a car not engine is 50%, when temperature of outlet is 500 K. in order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of out let.

A
200 K

B
400 K

C
600 K

D
800 K

Solution
Question 8
4 / -1

An ideal refrigerator has a freezes at a temperature of ‒13^o C , The coefficient of performance of the engine is 5. The temperature of the air to which heat is rejected will be.

A
325^o C

B
39^o C

C
325 K

D
320^o C

Solution
Question 9
4 / -1

An engine is supposed to operate between two reservoirs at temperature 727^oC and 227^oC.The maximum possible efficiency of such an engine is

A

B

C

D
1

Solution
Question 10
4 / -1

What is the value of sink temperature when efficiency of engine is 100%

A
300 K

B
273 K

C
0 K

D
400 K

Solution