Thermodynamics Test

Result

Thermodynamics Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

Starting with the same initial conditions, an ideal gas expands from volume V₁ to V₂ in three different ways. The work done by the gas is W₁ if the process is purely isothermal, W₂ if purely isobaric and W₃ if purely adiabatic. Then

A
W₂ > W₁ > W₃

B
W₂ > W₃ > W₁

C
W₁ > W₂ > W₃

D
W₁ > W₃ > W₂

Solution
Question 2
4 / -1

A block of ice at –10^oC is slowly heated and converted to steam at 100^oC, which of the following curves represents the phenomena qualitatively ?

A

B

C

D
Question 3
4 / -1

An ideal monoatomic gas is taken round a cycle ABCDA as shown in Fig. Work done during the cycle is

A
2 PV

B
PV

C
PV/2

D
zero
Question 4
4 / -1

If AB is an isothermal, BC is an isochoric and AC is an adiabatic, which of the graph correctly represents them in Fig. ?

A

B

C

D
Question 5
4 / -1

An ideal gas is taken through the cycle A → B → C → A, as shown in Fig. If the net heat supplied to the gas in the cycle is 5 J, work done by the gas in the process C → A

A
– 5 J

B
– 10 J

C
– 15 J

D
– 20 J
Question 6
4 / -1

Two rods, one of aluminium and the other made of steel, having initial lengths l₁ + l₂ are connected together to form a single rod of length (l₁ + l₂). The coefficient of linear expansion of aluminium and steel are α_a and α_s respectively. If the length of each rod increases by the same amount, when their temperature are raised by t^oC, then the ratio l₁/(l₁ + l₂) is

A

B

C

D

Solution
Question 7
4 / -1

2 kg of ice at – 20^oC is mixed with 5 kg of water at 20^oC in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg/^oC and 0.5 kcal/kg/^oC. While the latent heat of fusion of ice = 80 kcal/kg

A
7 kg

B
6 kg

C
4 kg

D
2 kg

Solution
Question 8
4 / -1

An ideal gas expands isothermally from a volume V₁ to V₂ and then compressed to original volume V₁ adiabatically. Initial pressure is P₁ and final pressure is P₃. Total work done is W. Then

A
P₃ > P₁ ; W > 0

B
P₃ < P₁ ; W < 0

C
P₃ > P₁ ; W < 0

D
P₃ = P₁ ; W = 0.

Solution
Question 9
4 / -1

Three discs A, B and C having radii 2m, 4m and 6m respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are 300 nm, 400 nm and 500 nm respectively. The power radiated by them are Q_A, Q_B and Q_C respectively.

A
Q_A is maximum

B
Q_B is maximum

C
Q_C is maximum

D
Q_A = Q_B = Q_C

Solution
Question 10
4 / -1

A cup of tea cools from 65.5^oC to 62.5^oC in one minute in a room of 22.5^oC. How long will the same cup of tea take to cool from 46.5^oC to 40.5^oC in the same room. (Choose the nearest value in min.)

A
1

B
2

C
3

D
4

Solution