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,
Answers
Explanation:
1. Heat conduction (or thermal conduction) is the movement of heat from one object to another one that has different temperature when they are touching each other. For example, we can warm our hands by touching hot-water bottles. ... Other ways to transfer heat are by thermal radiation and/or convection.
2. Conductors conduct electrical current very easily because of their free electrons. Insulators oppose electrical current and make poor conductors. Some common conductors are copper, aluminum, gold, and silver. Some common insulators are glass, air, plastic, rubber, and wood.
3. Convection is a type of heat transfer that can only happen in liquids and gases, because it involves those liquids or gases physically moving. Convection happens when there is a difference in temperature between two parts of a liquid or gas. The hot part of a fluid rises, and the cooler part sinks.
4. When heat radiation fall on polished surface or white objects, most of the heat energy is reflected black but when these heat energy are absorbed and very less amount of energy is reflect back apart from this black body absorbs more heat because black colours absorbs all colours of light energy, the more light is ...
5. Precautions Taken While Reading a Thermometer - definition
Thermometer should be washed before and after use, preferably with an antiseptic solution. Ensure that before use the mercury level is below 350C. Handle the thermometer with care. If it hits against some hard object, it can break.
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Explanation:
question no.4
Answer:
black bodies are good heat absorbers because it absorbs any colour,and all light+heat energy with it.it does not reflect because it does not have the properties of reflecting off light as a light colour could.white colours reflect into the 7 colours of rainbow when light gets on it.white colour reflects or bounces off light.for exapmle a white car would not be as hot as a black car.radiation is the emission of energy as electromagnetic waves or as moving subatomic particles.it is the energy that reflects off and travels at the speed of light.
question no.1
answer:
conduction refers to the travel of energy through good solides such as steel,copper or metal.it travels by passing on the heat to the particles next to each other until the whole of something is hot.it will keep passing on heat until it runs out of particles.the heat will only travel if two bodies(or particiles)are in contact along with having temperature difference.
question no.3
answer:
convection are waves carrying heat energy as they they pass.convection is the transfer of heat due to bulk movement of particles in fluid.it does not take place is solids because no current neither heat currents travel in solids.
question no.5
answer:
thermometer should be washed before and after use with an antiseptic solution.
the Mercury level should be below 350C°.
it is fragile so it should be handled with care or it will break when it hits a hard surface.
question no.2
answer:
conductors produce or pass heat and insulators absorb or disallow heat to pass through in simple words.
cotton,plastic is poor conductors or insulators.
steel,iron and metal are best conductors of heat.
I hope this helps you