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
Answers
Answer:
1) because metal expands on heating and contracts on cooling.
2) A clinical thermometer has a narrow kink in the capillary tube because when Mercury expands, it pushes through the kink, but when it's taken out of patient mouth, Mercury does not go back to the bulb beacuse if it. Hence, doctor can read the patients temperature easily .
3) A new quilt is warmer than an old one. ... A new quilt is warmer because the air which is trapped inside the cotton or woollen clothing acts as an insulator and does not allow the transfer of heat. However, when the quilt gets older, the air spacing of the cotton or wool gets compressed.
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. ... Thus, a brass tumbler feels colder than a wooden tray on a chilly day.
5) The bottoms of the cooking utensils are kept black because black colors absorb heat faster than any other color. For cooking, we need that the supply of heat is fast so that the food cooks quickly. This is why the bottoms of the cooking utensils are kept black in color.
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Answer:
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
Explanation: