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Which of the following are desirable cha...

Which of the following are desirable changes ?
(i) Drying of clothes
(ii) Melting of ice cream
(iii) Cement getting hard when exposed to moisture
(iv) Desalination of sea water

A

(i) and (ii) only

B

(i) and (iv) only

C

(ii) and (iii) only

D

(ii) and (iv) only

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given changes are desirable, we need to understand what a desirable change is. A desirable change is one that is beneficial or favorable, often occurring naturally. Let's analyze each option step by step: ### Step 1: Analyze the first option - Drying of clothes - **Explanation**: Drying of clothes occurs when they are exposed to sunlight and warm air. This is a natural process that helps remove moisture from the clothes. - **Conclusion**: This is a desirable change. ### Step 2: Analyze the second option - Melting of ice cream - **Explanation**: Melting of ice cream happens when it is heated, causing it to change from solid to liquid. While it may be enjoyable to eat melted ice cream, the melting itself is not a natural process; it requires external heat. - **Conclusion**: This is a non-desirable change. ### Step 3: Analyze the third option - Cement getting hard when exposed to moisture - **Explanation**: Cement hardens when it comes into contact with moisture, which is a chemical reaction. This process is not a natural occurrence but rather a result of mixing cement with water. - **Conclusion**: This is a non-desirable change. ### Step 4: Analyze the fourth option - Desalination of seawater - **Explanation**: Desalination refers to the process of removing salt from seawater to make it suitable for drinking. This can occur naturally through evaporation in the water cycle, where water evaporates and leaves salt behind. - **Conclusion**: This is a desirable change. ### Final Summary Based on the analysis: - **Desirable Changes**: - Drying of clothes (Option 1) - Desalination of seawater (Option 4) - **Non-Desirable Changes**: - Melting of ice cream (Option 2) - Cement getting hard when exposed to moisture (Option 3) Thus, the desirable changes are **Option 1 and Option 4**.
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