One of the ways of heat transmission is conduction Which of the following statements can be explaine...........

Science Affairs Physics

One of the ways of heat transmission is conduction. Which of the following statements can be explained by this phenomenon?

1. During severe winters, Eskimos live in snow huts called igloos.

2. Ice slabs are covered with saw dust to minimize melting.

3. A refrigerator has to be switched off for defrosting whenever a thick layer of ice deposits on the outside and inside of the freezer.

4. Heating elements in water heaters and geysers are fitted near the bottom.

Select the correct answer from the codes given below

1 and 3 only

1, 2 and 3 only

2 and 4 only

2, 3 and 4 only

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Explanation:

During severe winters, Eskimos live in snow huts called igloos because snow being poor conductor shields them from cold. Ice slabs are covered with saw dust to minimize melting because saw dust is a bad conductor of heat.
A refrigerator has to be switched off for defrosting whenever a thick layer of ice deposits on the outside and inside of the freezer. Ice, being a poor conductor, affects the cooling action of the freezer. Thus defrosting helps in efficient functioning of refrigerator.
Heating elements in water heaters and geysers are fitted near the bottom so that water can be heated by convective currents, hence an application of convection and not conduction.

https://timesofindia.indiatimes.com/Though-igloos-are-made-of-snow-it-is-warm-inside-Why/articleshow/914709.cms

https://www.youtube.com/watch?v=1L7EI0vKVuU