Online MCQs Quiz Unit-10: Thermodynamics

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HSSC-1 (Class-11) Physics (New Book/KPK Text Board, Peshawar)

1. Assume we can change the equilibrium state of a system via two different processes. Assume that the initial and the final state are the same. Which of the quantities `\Δ_U`, ΔQ, ΔW, and ΔT must be the same for the two processes?

10 points

A. Only ΔQ and ΔW

B. Only ΔU and ΔT

C. Only ΔQ and ΔT

D. Only ΔU and ΔW

Clear selection

2. In any process the maximum amount of mechanical energy that can be converted to heat

10 points

A. Depends upon the amount of friction

B. Depends upon the intake and exhaust temperature

C. Depends upon whether kinetic or potential energy is involved

D. Is 100%

Clear selection

3. In an isothermal change, internal energy

10 points

A. Decreases

B. Increases

C. Become zero

D. remain constant

Clear selection

4. A thermos bottle containing hot coffee is vigorously shaken. Consider coffee as system , then its temperature

10 points

A. Increases

B. Decreases below than 0°

C. Remains the same

D. Decreases

Clear selection

5. Maximum work can be obtained in tie process called

10 points

A. Cyclic

B. Adiabatic

C. Isothermal

D. Isochoric

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6. A heat engine takes in 800 J of heat at 1000 K and exhausts 600 J of heat at 400 K. What the actual efficiency of this engine?

10 points

A. 25%

B. 40%

C. 50%

D. 75%

Clear selection

7. If the temperature of the heat source is increased, the efficiency of a Carnot's engine :

10 points

A. Increases

B. Decreases

C. Remains constant

D. First increases and then becomes constant

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8. Triple point of water is

10 points

A. 273.16°F

B. 273.16°K

C. 273.16°F

D. 273.16°K

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9. A real gas can be approximated to an ideal gas at

10 points

A. Low density

B. High pressure

C. High density

D. Low temperature

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10. If the volume of the gas is to be increased by 4 times, then

10 points

A. Temperature and pressure must be double

B. At constant P the temperature must be increased by four times

C. At constant T the pressure must be increased by four times

D. It cannot be increased

Clear selection

11. In which of the systems listed below is the entropy decreasing?

10 points

A. A gas is cooled.

B. A plate is shattered.

C. An egg is scrambled.

D. A drop of dye diffuses in a cup of water.

Clear selection

12. If the temperature of source and sink of a Carnot engine having efficiency η are each decreased by 100K, then the efficiency η :

10 points

A. remain constant

B. 0.001 m³/s

C. increases.

D. decreases

Clear selection

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