Question

Take a test tube. Fix some wax at its bottom portion. Pour some water into the test tube. Tilt the test tube as shown and heat the water at the top of the test tube. Observe the wax at the bottom. You will find that the wax has not melted. Why?

• A. When water is heated at the top, hot water being light does not come down and thus no convection of heat takes place
  
• B. Wax has a very high melting point hence it does not get melted
• C. Both A and B are correct
• D. None of the above

Answer 1

The correct option is A When water is heated at the top, hot water being light does not come down and thus no convection of heat takes place

When water is heated at the top, hot water being light does not come down and thus no convection of heat takes place. Also, water and glass being bad conductors of heat, the heat in hot water at the top is not transferred to the portion of water at the bottom. Hence, the wax does not melt.