Roshni is a student of class IX in a school in Delhi. One day Roshni’s mother, Mrs. Deepa, was complaining that the woollen and silk clothes which she had stored in closed steel trunks had been partially eaten up and damaged by some tiny insects. Mrs. Deepa had to spend a lot of money to get these damaged clothes repaired. When Roshni heard her mother complaining, she asked her to place some small, white balls of a particular material inside the folds of the woollen and silk clothes before storing them again in trunks, and closing the lids of trunks properly. Mrs. Deepa did the same. When Mrs. Deepa opened the trunks again after about six months to take out a silk saree for a marriage function, she found that the stored clothes had remained safe, they had not been damaged this time. At the same time, she noticed that the small white balls placed inside the folds of clothes had become much smaller in size. Mrs. Deepa asked Roshni why the white balls had become much smaller in size. Roshni explained everything to her mother. Roshni also told her mother that one day all the white balls placed for protecting stored woollen and silk clothes would disappear completely without leaving behind any residue and then new balls will have to be placed for further protection of stored clothes.
Based on your understanding, answer the following:
(a) What is the usual name of the tiny insects which eat up and damage stored woollen and silk clothes in Roshni’s home ?
(b) What is the material of small white balls placed in stored woollen and silk clothes by Mrs. Deepa ? (c) How do the small white balls placed inside the folds of stored clothes work to prevent damage to stored clothes ?
(d) Why do small white balls kept within the folds of stored woollen and silk clothes become smaller and smaller with time and ultimately disappear completely one day ? What is the special name of the process which makes the white balls become smaller or disappear completely without leaving behind any residue ?
(e) Name one other material whose balls can also be used for the protection of stored woollen and silk clothes.
Answers
Explanation:
What is the usual name of the tiny insects which eat up and damage stored woollen and silk clothes in Roshni’s home ?
Answer:- They are commonly called Moths, which are found on the woollen clothes and eat them up.
What is the material of small white balls placed in stored woollen and silk clothes by Mrs. Deepa ?
Answer:- It is commonly called as Napthalene, and Napthalene balls are stored to prevent moths to eat up those woollen clothes.
How do the small white balls placed inside the folds of stored clothes work to prevent damage to stored clothes ?
Answer:- These balls sublime themselves ie convert into gaseous form, and then it prevents the moths to eat the clothes.
Why do small white balls kept within the folds of stored woollen and silk clothes become smaller and smaller with time and ultimately disappear completely one day ? What is the special name of the process which makes the white balls become smaller or disappear completely without leaving behind any residue ?
Answer:-- They become smaller and smaller day by day because they turn into their gaseous form from the solid form.
This is called Sublimation and it doesn't leave behind any residue.
Name one other material whose balls can also be used for the protection of stored woollen and silk clothes.
Answer:- We can keep cloves to prevent it, however it is not a sublime object
Required Answer :-
a)Moth
b) Napthalene ball
c) The small white balls placed inside the clothes help to protect as the napthalene ball are dangerous to moths.
d) The process is known as sublimation.
e) Camphor
Know More :-
Sublimation is the process of converting a solid substance into a gas substance.
Camphor - It is also used to prevent cloth for damaging by moths. This is an compound.