Question

Which of the following represent practical uses of good insulators of heat?

• A. Sawdust being a bad conductor of heat is used to cover ice blocks and prevent them from melting quickly
• B. Saucepans are provided with wooden handles, as wood is a poor conductor of heat, pans can be held even when it is hot
• C. Ice boxes refrigerators have inner linings of glass wool which is a very poor conductor of heat. This greatly minimizes the chances of heat passing into them
• D. None of the above

Answer 1

Answer: (A), (B), (C)

The correct options are
A Sawdust being a bad conductor of heat is used to cover ice blocks and prevent them from melting quickly
B Saucepans are provided with wooden handles, as wood is a poor conductor of heat, pans can be held even when it is hot
C Ice boxes refrigerators have inner linings of glass wool which is a very poor conductor of heat. This greatly minimizes the chances of heat passing into them

Option A: This statement is true because sawdust is insulator as it does not allow heat to enter into ice block and prevent it from melting.

Option B: This statement is true because wood is insulator and it will not allow heat to enter into handles and we can use it.

Option C: This statement is true because glass wool is insulator and does not heat to enter ice box refrigerator.