10. Types of changes with explained examples

Exercise condition:

6 m.

Read the options and select the best one:

1. Assertion (A): Conversion of a solid into a liquid on cooling is known as melting.
Reason (R): Process where the water changes into water vapour on heating is known as evaporation.

A is true but R is false
Both A and R are true but R is not the correct explanation of A
Both A and R are true and R is the correct explanation of A
A is false but R is true

2. Assertion (A): Rusting of iron is an example of chemical change.
Reason (R): The rusting of iron is due to their exposure to air and water.

A is false but R is true
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not the correct explanation of A
A is true but R is false

3. Assertion (A): There is a small gap left between the rails of a railway track.
Reason (R): Cooling of substances result in contraction.

A is true but R is false
A is false but R is true
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not the correct explanation of A

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