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CBSE Class 11 (Science) Thermal Properties of Matter & Thermodynamics — practice questions — page 7

Explore 267 free Thermal Properties of Matter & Thermodynamics questions in CBSE Class 11 (Science) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Thermal Properties of Matter & Thermodynamics questions and exercises with answers

Showing questions 181–210 of 267.

A Carnot engine takes heat from a 800 K source and rejects it at 400 K. What is its efficiency?Read the answer and worked solution →A Carnot engine works between 500 K and 300 K. What fraction of the absorbed heat becomes work?Read the answer and worked solution →An engine absorbs 600 J per cycle and has an efficiency of 0.25. How much work does it do per cycle?Read the answer and worked solution →A Carnot cycle is made of which combination of steps?Read the answer and worked solution →In the isothermal compression of a Carnot cycle, heat is?Read the answer and worked solution →In the Carnot cycle, the heat absorbed during isothermal expansion equals which quantity?Read the answer and worked solution →Stirring a liquid in contact with a reservoir cannot be exactly reversed because that would violate which law?Read the answer and worked solution →Temperature of a body is best described as which of these?Read the answer and worked solution →Heat flows between a system and its surroundings because of a difference in what?Read the answer and worked solution →What is the SI unit of heat energy transferred?Read the answer and worked solution →Which property is commonly used in liquid-in-glass thermometers?Read the answer and worked solution →How many fixed reference points are needed to define a standard temperature scale?Read the answer and worked solution →On the Fahrenheit scale, which values do the ice point and steam point have?Read the answer and worked solution →How many equal intervals lie between the two fixed points on the Fahrenheit scale?Read the answer and worked solution →A bath water reads 50 °C. What is this temperature on the Fahrenheit scale?Read the answer and worked solution →At what temperature do the Celsius and Fahrenheit scales show the same number?Read the answer and worked solution →A room is at 77 °F. What is its temperature in degrees Celsius?Read the answer and worked solution →For a fixed mass of gas at constant temperature, which quantity stays constant?Read the answer and worked solution →Which equation is the ideal-gas equation for µ moles of gas?Read the answer and worked solution →What is the value of the universal gas constant R?Read the answer and worked solution →In a constant-volume gas thermometer, temperature is read in terms of which quantity?Read the answer and worked solution →What value of absolute zero is obtained by extrapolating gas pressure to zero?Read the answer and worked solution →The absolute temperature scale is named after which scientist?Read the answer and worked solution →Which relation connects the Kelvin temperature T and Celsius temperature tC?Read the answer and worked solution →A furnace is at 27 °C. About what temperature is that in kelvin?Read the answer and worked solution →How does one kelvin compare in size with one degree Celsius?Read the answer and worked solution →At which temperature is the triple point of water located?Read the answer and worked solution →Why is the triple point of water preferred as a fixed point?Read the answer and worked solution →The increase in dimensions of a body due to a rise in its temperature is called what?Read the answer and worked solution →What is the expansion in length of a solid on heating called?Read the answer and worked solution →

Worked practice questions

A Carnot engine takes heat from a 800 K source and rejects it at 400 K. What is its efficiency?

  1. 25 percent
  2. 40 percent
  3. 75 percent
  4. 50 percent
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Correct answer: D. 50 percent

Efficiency is 1 minus 400/800, which equals 0.5, or 50 percent.

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A Carnot engine works between 500 K and 300 K. What fraction of the absorbed heat becomes work?

  1. 0.4
  2. 0.6
  3. 0.8
  4. 0.2
Show answer and solution

Correct answer: A. 0.4

Efficiency equals 1 minus 300/500, which is 0.4.

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An engine absorbs 600 J per cycle and has an efficiency of 0.25. How much work does it do per cycle?

  1. 75 J
  2. 450 J
  3. 150 J
  4. 300 J
Show answer and solution

Correct answer: C. 150 J

Work equals efficiency times heat absorbed, 0.25 times 600 J, giving 150 J.

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