Daily Olympiad: Science - Changes Around Us [20260511]

Challenge yourself with today's CBSE practice! This test covers 'Changes Around Us' for Science (Grade 6). Level: Easy | Duration: 30 mins.

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1. Which of the following is an example of a physical change?

Solution
Correct: A
Melting of wax is a physical change because it only changes the state of the substance without forming new substances and can be reversed by cooling.

2. Which of the following changes is irreversible?

Solution
Correct: B
Cooking an egg is irreversible because the proteins denature and form new structures, making it impossible to return to the original state.

3. Which process involves both physical and chemical changes?

Solution
Correct: B
Boiling an egg involves physical change (water boiling) and chemical change (egg proteins denaturing).

4. Which of the following is a chemical change?

Solution
Correct: C
Digestion of food is a chemical change as the food is chemically broken down into nutrients that cannot be reversed.

5. Which of the following is a natural change?

Solution
Correct: B
Ripening of fruit is a natural, biological process that occurs without human intervention.

6. Which change is caused by adding heat?

Solution
Correct: A
Melting of ice is a physical change caused by heating (increase in thermal energy).

7. Which change is permanent and cannot be reversed?

Solution
Correct: B
Rusting of iron is a chemical change where iron reacts with oxygen and water to form irreversible rust.

8. Which of the following is an example of a desirable change?

Solution
Correct: C
Cooking rice is a desirable change because it makes the rice safe and palatable to eat.

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