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GK QUESTION#3540

Which statement correctly explains the factors affecting the physical state of matter?

  1. AOnly external force determines the state
  2. BOnly heat energy controls state changes
  3. CPhysical state remains fixed under all conditions
  4. DBoth temperature and pressure affect the state of a substanceCorrect answer
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Answer

D. Both temperature and pressure affect the state of a substance

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Explanation

Both temperature and pressure can affect a substance’s physical state. Heating changes particle energy, while changing pressure can favour a more or less closely packed phase. Phase boundaries depend on both variables, as shown by a pressure–temperature phase diagram.

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