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SUBJECTIVE

Q. Questions Skill Marks
No.
1. Mention the changes in the following cases. u 1

a) Cutting of paper into small pieces.
b) Curdling of milk.

2. Photosynthesis is a chemical change. Give an evidence in U 1
support of your answer.

3. Choose the correct option from the following: R 1
a) If both Assertion and Reason are correct and Reason
is the correct explanation of Assertion.
b) If both Assertion and Reason are correct, but Reason
is not the correct explanation of Assertion.
c) If Assertion is correct but Reason is incorrect.
d) If Assertion is incorrect but Reason is correct.
e) If Assertion & Reason both are incorrect.
Assertion (A): Precipitation reaction is an example of
physical change.

Reason (R): Precipitate is a solid substance that deposit from
a solution.

4. Classify the changes as physical or chemical(Give Reason):- HOTS 3

a) Evaporation of alcohol.
b) Sublimation of dry ice into carbon dioxide.
c) Sugar caramelises on heating


5. Write the observation indicating the changes happening there. 5
U & A

a) When a pinch of baking soda added to lemon juice.
b) A piece of iron is kept outside for a long time.
c) A tea spoon of sugar is added to water.
d) A bio gas produce by decomposition.
e) Milk has kept outside for long period of time

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