Justify the statement:A)A new quilt is warmer than the old one .B)The bottom of cooking utensils are often kept black.C)Iron rims are heated red hot before fixing them on cart wheels.
Answers
Answer:
a)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. It no longer remains a good insulator.
b)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.
c)The iron ring to be put on the rim of a cart wheel is always of slightly smaller diameter than that of the wheel. When the iron ring is heated to become red hot, it expands and slips on to the wheel easily. When it is cooled, it contracts and grips the wheel firmly.
Explanation:
Hope this helps.
Explanation:
you are a president of cleanliness club of your school .many of the students letters the class ,playgrounds with aluminium foils, toffee wrappers , juice tetra packs cold drinks cane and plastic bottles write a notice appel students not to little and instead use dustbin to maintain cleanliness in and around the school princess