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1 Physics -- Second Law of Thermodynamics

Q1. A measure of the degree of disorder of a system is known as Enthalpy Isobaric Isotropy EntropyQ2. If ΔThe efficiency of Carnot engine operating with reservior temperature at 100 K and –23 K will be (100 + 23)/100 (100 - 23)/100 (100 + 23)...

Q1. A measure of the degree of disorder of a system is known as

  •  Enthalpy
  •  Isobaric
  •  Isotropy
  •  Entropy

Q2. If ΔThe efficiency of Carnot engine operating with reservior temperature at 100 K and –23 K will be

  •  (100 + 23)/100
  •  (100 - 23)/100
  •  (100 + 23)/373
  •  (100 - 23)/373

Q3. Coefficient of performance of an ideal refrigerator working between temperature T1 and T2 (T1 > T2) is

  •  β = T2/(T1 - T2)
  •  β = T2/(T1 + T2)
  •  β = T1/(T1 - T2)
  •  β = T1/(T1 + T2)

Q4. Entropy of a thermodynamic system does not change when this system is used for

  •  Conduction of heat from a hot reservoir to a cold reservoir
  •  Conversion of heat into work isobarically
  •  Conversion of heat into internal energy isochorically
  •  Conversion of work into heat isochorically

Q5. The second law of thermodynamics states that

  •  Heat is neither created nor destroyed
  •  Heat can be converted into other forms of energy
  •  Heat flows from a hot object to a cold one
  •  The mechanical equivalent of heat is the amount of energy that must be expended in order to produce heat

Q6. A Carnot engine works between ice point and steam point. Its efficiency will be

  •  26.81 %
  • 53.36 %
  •  71.23 %

1 Answers

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1: A measure of the degree of disorder of a system is known as enthalpy.

2: If ΔThe efficiency of Carnot engine operating with reservior temperature at 100 K and –23 K will be (100+23)/100.

3: Coefficient of performance of an ideal refrigerator working between temperature T1 and T2 (T1 > T2) is Beta = T2 / (T1 - T2).

4: Entropy of a thermodynamic system does not change when this system is used for conduction of heat from a hot reservoir to a cold reservoir.

5: The second law of thermodynamics states that Heat is neither created nor destroyed.

6: A Carnot engine works between ice point and steam point. Its efficiency will be 26.81%.

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A Carnot engine whose high-temperature reservoir is at 620 K takes in 550 J of heat at this temperature in each cycle and gives up 335 J to the low-temperature reservoir. (a) How much mechanical wo...

A Carnot engine whose high-temperature reservoir is at 620 K takes in 550 J of heat at this temperature in each cycle and gives up 335 J to the low-temperature reservoir. (a) How much mechanical work does the engine perform during each cycle? (b) What is

Solution:

Given,

Temperature of high-temperature reservoir (T1) = 620 K

Energy taken in each cycle (Q1) = 550 J

Energy given to low-temperature reservoir (Q2) = 335J

Now,

Mechanical work done in each cycle = Q1 - Q2

 = 550 J - 335 J

= 215 J

Let...

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Does a refrigerator full of food consume more power if the room temperature is 20°C than if it is 15°C?

The efficiency of a refrigerator is expressed as:

Beta = T2 / (T1 - T2)

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