A. Insulating materials B. Conducting materials which are magnetic C. Conducting materials which are non-magnetic D. Conducting materials which may or may not be magnetic
A. By disconnecting some of the heating elements B. By varying the operating voltage C. by varying the current through heating elements D. by any of the above method
A. Bodies are kept in vacuum B. Bodies are immersed in water C. Bodies are exposed to thermal radiations D. Temperatures of the two bodies are identical
A. Inside boiler furnaces B. During melting of ice C. Through the surface of the insulted pipe carrying steam D. From refrigerator coils to freezer of a refrigerator
