EXERCISES
VERY SHORT ANSWER TYPE QUESTIONS
1. A metal spoon is dipped in a cup of hot milk. Name the process by which the poor best frem
the milk
2. Name the mode of heat transfer in which the particles of a medium actually move to the war of the
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 two uses of conductors of heat.
3
Give examples of heat transfer by radiation.
4. Why does a shiny tea pot stay hotter than a dull brown tea pot?
5. Why are handles of cooking utensils made of insulators ?
Answers
Answer:
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. Warm air being lighter rises up and leaves the room through the ventilators.
4. thermometer
A thermometer is an instrument that measures temperature. It can measure the temperature of a solid such as food, a liquid such as water, or a gas such as air. The three most common units of measurement for temperature are Celsius, Fahrenheit, and kelvin.
5. Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.
short type questions answer :
1. The three temperature scales are Celsius, Fahrenheit and Kelvin. ... The relationship between Celsius and Fahrenheit is a little bit more complex than that of Celsius and kelvins, but not too tricky. Celsius and Fahrenheit have different degrees and a different zero point.
2. Aluminum, copper and stainless steel are good heat conductors as they are metals, They are used in making cooking pots and the kettles that are used in the houses and the factories.
3. Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of the Earth by the Sun. A less obvious example is thermal radiation from the human body.
4. A shiny tea pot stays hotter than dull brown pot because the shiny surface does not radiate heat from it.
5. Because when the product heats up or boils it also causes the conductor to heat up and when we hold the utensils our hand may burn therefore the handles are made up of insulators.
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