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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Subjects
Science State Board
Class 8
Changes around us
Chemical reaction and its conditions

15. Changes with explained examples

Exercise condition:

6 m.

Read the two statements carefully and decide if the given options are correct:

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

2. Assertion (A): Decaying of food is a chemical change.
Reason (R): Decaying of food is not a permanent change.

A is false but R is true
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

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

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 true but R is false
A is false but R is true

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