Question

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Answer 1

Answer:

Question:18

Wooden handle

We use wooden handle because wood is a poor conductor of heat.

Light-coloured clothes

We prefer light-coloured clothes in summer because they reflect most of the sun's heat and absorb very little of the sun's heat and keeps our body cool.

Dark-coloured clothes

We wear dark-coloured clothes in winter as they keep us warm by absorbing all the heat radiations coming from the hot Sun.

Sit in front of room heater

It is because the heat reaches us directly from the fire place as we are sitting in front of the fire place (room heater). The heat is transferred to us in the form of radiations

Two Thin Blankets

Air is trapped in the space between two thin blankets. As Air is a bad conductor of heat, it prevents the escape of body heat. That is why two thin blankets are usually warmer than one thick blanket

Hollow Bricks

hollow bricks are used in constructing a building because they reduce heat and keeps the building cool.

Question:19

Conduction

Radiation