Thermodynamics Test

Result

Thermodynamics Test - 73

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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following gases possesses the largest internal energy ?

A
2 moles of helium occupying 1m³ at 300 K

B
56 kg of nitrogen at 107 Nm^–2 and 300 K

C
8 g of oxygen at 8 atm and 300 K

D
6 × 10²⁶ molecules of argon occupying 40m³ at 900 K

Solution
Question 2
4 / -1

Two samples A and B of a gas initially at the same pressure and temperature are compressed from volume V to V/2 (A isothermally and adiabatically). The final pressure of A is

A
Greater than the final pressure of B

B
Equal to the final pressure of B

C
Less than the final pressure of B

D
Twice the final pressure of B

Solution
Question 3
4 / -1

A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62°C, the efficiency of the engine is doubled. The temperatures of the source and sink are

A
80°C, 37°C

B
95°C, 28°C

C
90°C, 37°C

D
99°C, 37°C

Solution
Question 4
4 / -1

123. Find the change in the entropy in the following process 100 g of ice at 0°C melts when dropped in a bucket of water at 50°C (Assume temperature of water does not change)

A
– 4.5 cal/K

B
+ 4.5 cal/K

C
+5.4 cal/K

D
– 5.4 cal/K

Solution
Question 5
4 / -1

A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are : P_A = 3 × 10⁴ Pa, P_B = 8 × 10⁴ Pa and V_A = 2 × 10^–3 m³, V_D = 5 × 10^–3 m³. In process AB, 600 J of heat is added to the system and in process BC,200 J of heat is added to the system. The change in internal energy of the system in process AC would be

A
560 J

B
800 J

C
600 J

D
640 J

Solution
Question 6
4 / -1

Four curves A, B, C and D are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are

A
C and D respectively

B
D and C respectively

C
A and B respectively

D
B and A respectively
Question 7
4 / -1

In pressure-volume diagram given below, the isochoric, isothermal and isobaric parts respectively, are

A
BA,AD,DC

B
DC,CB,BA

C
AB,BC,CD

D
CD,DA,AB
Question 8
4 / -1

The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from A → B → C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is

A
34 J

B
70 J

C
84 J

D
134 J

Solution
Question 9
4 / -1

In the following indicator diagram, the net amount of work done will be

A
Positive

B
Negative

C
Zero

D
Infinity
Question 10
4 / -1

A cyclic process for 1 mole of an ideal gas is shown in figure in the V-T, diagram. The work done inAB, BC and CA respectively

A

B

C

D

Solution