1. Radiation (a) does not require any medium (b) is the process of transfer of heat in liquids (c) is the process of transfer of heat in which heat traveles in one direction. (d) Occurs in solids. 2. A Thermos flask prevents loss or gain of heat by a. conductions only b. convections only c. radiation only d. all the above 3. Handles of cooking utensils should be made of material that a. conducts heat well b. does not conduct heat c. radiate heat well d. does not radiate heat 4. Sea breeze and land breeze a. are caused by currents set up in air due to conduction b. are caused by currents set up in air due to convection c. are caused by currents set up in air due to radiation d. have no relation to conduction, convection and radiation 5. Which of the following is the best heat insulator a. air b. steel c. copper d. iron 6. He
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