WBCS.LIVE practice question

At what temperature does water have its maximum density?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 0°C
  2. 4°C
  3. -4°C
  4. 100°C

Correct answer and explanation

Correct answer: 4°C

Explanation: ✅ Correct Answer: B) 4°C 📚 Explanation: Water exhibits anomalous expansion where it contracts when heated from 0°C to 4°C, reaching its maximum density at this point. Beyond 4°C, it begins to expand normally like other liquids, causing its density to decrease. This unique property is essential for the survival of aquatic life as it allows the bottom of lakes to remain liquid even when the surface is frozen.