Daily Olympiad: Science - Changes Around Us [20260511] – 8 Practice Problems & Printable PDF

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

A. Melting of wax B. Burning of paper C. Cooking of food D. Ripening of fruit

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?

A. Stretching of a rubber band B. Cooking of an egg C. Deflating a balloon D. Freezing of water

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?

A. Drying of clothes B. Boiling of an egg C. Melting of ice D. Folding of paper

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?

A. Bending a wire B. Breaking a glass C. Digestion of food D. Magnetizing a nail

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?

A. Cutting of paper B. Ripening of fruit C. Melting of wax D. Drying of paint

Solution

Correct: B

Ripening of fruit is a natural, biological process that occurs without human intervention.

6. Which change is caused by adding heat?

A. Melting of ice B. Tearing of cloth C. Dissolving sugar D. Burning of wood

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?

A. Stretching a spring B. Rusting of iron C. Boiling water D. Shredding paper

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?

A. Erosion of soil B. Rusting of gates C. Cooking of rice D. Folding of a shirt

Solution

Correct: C

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

Daily Olympiad: Science - Changes Around Us [20260511]

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

2. Which of the following changes is irreversible?

3. Which process involves both physical and chemical changes?

4. Which of the following is a chemical change?

5. Which of the following is a natural change?

6. Which change is caused by adding heat?

7. Which change is permanent and cannot be reversed?

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

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