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MDCAT Question Bank

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1009 available questions

Physics · Question 891

During the isothermal heat-absorption stage of a Carnot cycle, the system temperature:

  1. Rise
  2. Fall
  3. Remain constant
  4. May rise or fall
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Correct answer: C

Remain constant

The printed worksheet key marks C (Remain constant) as the correct answer.

Physics · Question 892

The efficiency of a practical heat engine depends on:

  1. Only the working substance
  2. Only the amount of working substance
  3. Only the source and sink temperatures
  4. The working system and reservoir temperatures
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Correct answer: D

The working system and reservoir temperatures

The printed worksheet key marks D (The working system and reservoir temperatures) as the correct answer.

Physics · Question 893

For an ideal gas of pressure P, the translational kinetic energy per unit volume is:

  1. P/2
  2. 3P/2
  3. P
  4. 2P
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Correct answer: B

3P/2

The printed worksheet key marks B (3P/2) as the correct answer.

Physics · Question 894

Hydrogen and oxygen are in thermal equilibrium. If an oxygen molecule is 16 times as massive as a hydrogen molecule, the rms speed of hydrogen is:

  1. 4 times oxygen's rms speed
  2. √6 times oxygen's rms speed
  3. √2 times oxygen's rms speed
  4. 16 times oxygen's rms speed
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Correct answer: A

4 times oxygen's rms speed

The printed worksheet key marks A (4 times oxygen's rms speed) as the correct answer.

Physics · Question 895

Gas pressure is directly proportional to which molecular-speed quantity?

  1. Mean molecular speed
  2. Rms molecular speed
  3. Individual molecular speeds
  4. Mean square molecular speed
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Correct answer: D

Mean square molecular speed

The printed worksheet key marks D (Mean square molecular speed) as the correct answer.

Physics · Question 896

A gas is initially at 0 °C. At what Celsius temperature is its rms molecular speed doubled?

  1. 273 °C
  2. 819 °C
  3. 1092 °C
  4. 103 °C
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Correct answer: B

819 °C

The printed worksheet key marks B (819 °C) as the correct answer.

Physics · Question 897

At what numerical temperature do the Fahrenheit and Kelvin scales have the same value?

  1. 460
  2. 574
  3. 340
  4. 525
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Correct answer: B

574

The printed worksheet key marks B (574) as the correct answer.

Physics · Question 898

At constant temperature if the pressure of gas is doubled then its volume becomes:

  1. Half
  2. Double
  3. Remains same
  4. Four times
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Correct answer: A

Half

The printed worksheet key marks A (Half) as the correct answer.

Physics · Question 899

Which one of following is true about ideal gas?

  1. Mean K.E is directly proportional to absolute temperature
  2. Average speed of gas molecules is not zero
  3. Average velocity of gas molecules is zero
  4. All of these
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Correct answer: D

All of these

The printed worksheet key marks D (All of these) as the correct answer.

Physics · Question 900

Which statements about the internal energy of an ideal gas are correct?

  1. It measures average translational kinetic energy
  2. It is proportional to absolute temperature
  3. It is a state function
  4. All of these
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Correct answer: D

All of these

The printed worksheet key marks D (All of these) as the correct answer.