A VERY SHORT ANSWER TYPE QUESTIONS 1. A metal spoon is dipped in a cup of hot milk Name the process by which the spoon absorbs heat from the milk 2. Name the mode of heat transfer in which the particles of a medium actually move to the source of heat. 3. During ventilation what is the direction of the convection current ? 4. Which device is used to measure temperature? 5. What sets the convection current in water? & SHORT ANSWER TYPE QUESTIONS 1. Name the three temperature scales. Write the relationship between them. 2. Mention to uses of conductors of heat. 3. Gue examples of heat transfer by radiation 4. Why does a shiny tea pot stay hotter than a dull brown tea pot 2 5. Why are handles of cooking utensils made of insulators ? C. LONG ANSWER TYPE QUESTIONS 1. Define conduction. What are the conditions for the conduction of heat ? 2. What are conductors and insulators of heat ? Give two examples of each. 3. Why is heat transfer by convection possible only in liquids and gases? How are land breeze and sea breeze caused? 4. Define radiation and radiant heat. Show by a simple experiment that black bodies are good heat absorber than white bodies 5. Mention the precautions to be taken while reading a thermometer to measure temperature.
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1)A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of Conduction.2)Process of heat transfer through movement of particles of medium from one place to another is convection.3)Answer: Warm air being lighter rises up and leaves the room through the ventilators. Fresh air from outside enters the room through the doors and windows.4)A thermometer is an instrument that measures temperature.5)Answer: convection currents are the result of differential heating. Lighter warm material rises while heavier cool materials sinks. It is the movement which creates circular patterns known as convection currents in water.
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