Question

29. Give reasons for the following:
i. Iron rods are heated red before 'fixing them on cart wheels.
ii. White or light coloured clothes are preferred during summer.
iii. The bottoms of cooking utensils are often kept black.
iv. Ice boxes are often made as double walled containers.
v. Clinical thermometer has a slight bend or kink in its capillary tube.​

Answer 1

Answer:

1 because on heat the metal expands and it can be turned into any shape hence adjusting easily on the cart would be easy.

2. because white reflects all the light hence not allowing the cloth to absorb light and it remains cool.

3. because black absorbs heat faster than any other color so the utensil gets heated up faster

Answer 2

Answer:

answer 1 :- iron rods are heated so that they expand on diameter as it is a property of metal ...and it should be more specifically known as a washer

answer 2 :- light coloured clothes absorb less amount heat so it is prefered in summer ..

answer 3:-we need utensils to cook so it has to be warm .so it keep warm it is coloured black as dark colour absorb heat ..

answer 4:- it is done so that heat cannot penetrate through the containers and melt the ice ..

answer 5:- now for this i don't know the exact reason but i can tell tht it is done so to make it easy for the mercury to flow  or slide ..

thank u

Explanation: