📊 Physics
Q. In barometer mercury is preferred over water because
  • (A) mercury is a good conductor of heat.
  • (B) mercury is shining and its level can be seen easily.
  • (C) mercury is available in pure form.
  • (D) mercury has high density and low vapour pressure.
✅ Correct Answer: (D) mercury has high density and low vapour pressure.

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