Question

2.
Give reasons for the following:
(a) Iron rims are heated red hot before 'fixing them on cart wheels.
(b) A clinical thermometer has a slight bend, or kink, in its capillary tube.
(c) A new quilt is warmer than an old one.
(d) A brass tumbler feels much cooler than a wooden tray on a chilly day.
(e) The bottoms of cooking utensils are often kept black.
Give short answers ​

Answer 1

Reason

1. rims are heated red because the cart wheel is bigger in size than the iron rim. so to expand the iron rim it is heated red. after it get expands,it is fixed on the rim and cold water is poured over it it so that it can contract again and get fixed on the rim
2. A slight bend or kink in the capillary tube of the clinical thermometer near the bulb ensures that the mercury does not move back into the bulb when the thermometer is taken out of a person’s mouth for reading.
3. In a new quilt, there are air spaces between the layers of the woollen thing. These air spaces trap the air. It does not allow the body heat to pass through by holding it. However, the old quilt, the air spaces are reduced between the layers resulting into less trapping of air.
4. Brass is a good conductor of heat. When one touches a brass tumbler, heat is conducted from the body to the brass tumbler easily. Hence, the temperature of the body reduces to a lower value and one feels cooler.
5. The bottoms of the cooking utensils are kept black because black colors absorb heat faster than any other color.

These are short answers only

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