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Q.

Is it true that a change takes place when two materials are not in contact?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
Matter can undergo two types of changes: physical changes and chemical changes. Physical changes are processes that alter a material's physical appearance but not its fundamental identity. Water evaporation is a physical change. A change cannot take place when two materials are not in contact because one material influences the other. For example, the sharpening of a pencil with the blade.
The corrected statement would be, “A change cannot take place when two materials are not in contact”.
 
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