Question

u Give two applications each of good and bad conductors UI Teat.
5. With the help of an experiment, show convection current in liquids.
6. With the help of an experiment, show conduction of heat in solids.​

Answer 1

Answer:

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5.When you put flask on flame, then the water at the bottom of the flask starts to heat. Hot water is always lighter than the cold water. Hence, the water starts to flow upward in the flask and the cold water of the upper surface starts to move down. These are called convection currents in water.

6.Take a few rods each made of a different substance (for example, three different metal rods). If the metal is a good conductor of heat, the wax will melt fairly quickly (because the heat will have passed all the way through the rod), dropping the coin.

Answer 2

Answer:

4. Good conductors:

1. mercury which is a good conductor is using in making thermometers

2. metals are used in making utensils for heating foodstuffs because they are good conductors of heat

Bad conductors:

1. utensil handles are made from non conductors to prevent getting burns

2. false ceilings are made in homes to prevent heat from entering

5.When you put flask on flame, then the water at the bottom of the flask starts to heat. Hot water is always lighter than the cold water. Hence, the water starts to flow upward in the flask and the cold water of the upper surface starts to move down. These are called convection currents in water.

6.Take a few rods each made of a different substance (for example, three different metal rods). If the metal is a good conductor of heat, the wax will melt fairly quickly (because the heat will have passed all the way through the rod), dropping the coin.

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