In which of the system Iisted below is the entropy decreasing:
Correct answer: A. A gas is cooled
- 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
Explanation
Cooling a gas removes energy and reduces the number of microstates available to it, so its entropy falls. Shattering a plate, scrambling an egg and letting a dye diffuse all increase disorder and therefore increase entropy.
This question appeared on the KMU Centralized Admission Test 2022 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Thermodynamics
Thermal equilibrium and heat explain how temperature and energy transfer are related, while molar specific heats describe the heat required by a gas at constant volume or constant pressure. The first law connects heat supplied, work done and change in internal energy, with sign conventions kept distinct from temperature changes.
Practise Thermodynamics
714 free Thermodynamics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Thermodynamics questions
If absolute temperature of the gas is doubled and pressure is increased 4 times, then the volume becomes
The internal energy of a fixed case of an ideal gas depends on:
For all irreversible process, the entropy of the system:
Identify the postulate(s) which help to formulate a mathematical model of gases:I. A finite volume of gas consists of a very large number of moleculesII. The size of the molecules is much smaller than the separation between moleculesIII. Molecules do not exert force on each other except during a collision.
What happens to the pressure 'P' of an ideal gas, if the temperature is increased by a factor of 2 and the volume is increased by a factor of 8?
If a gas is heated at constant pressure, which of the following description(s) will apply?I. The volume increase is proportional to the temperatureII. The kinetic energy of the molecules decreasesIII. The kinetic energy of the molecules increases