CBSE Class 8 Science Particulate Nature of Matter (Class 8 NCERT New) Quiz 8

1. Which of the following cooking procedures produces physical change?

A A Chopping carrots B B Boiling water C C Baking bread

2. At what temperature does melting occur?

A A at 20 °C B B at 30 °C C C at 40 °C

3. How can the graph be used to determine the melting and boiling points of the substance?

A A By identifying the temperature range where the substance transitions between phases. B B By indicating the temperatures from the plateaus on the graph.

4. Missy observed that a piece of paper is cut into smaller pieces and then burned. They are asked to categorize the changes that occurred. Which of the following best describes the changes she observed?

A A Cutting the paper is a physical change; burning the paper is a chemical change. B B Both are physical changes. C C Both are chemical changes.

5. A pure camphor tablet, when left out in the open completely disappears while leaving a minty scent into the air. What process do camphor tablets undergo when this happens?

A A Melting B B Sublimation C C Evaporation

6. Which of the following statements below are true based on the diagram? I. Iron is solid at room temperature. II. Iron will begin to turn into gas at 2000 °C III. Iron is liquid from point C to point D IV. Iron will start to liquefy at 1500 °C V. Iron is fully liquid at 1500 °C

A A I, II, III B B II, IV and V C C I, III and IV

7. Which of the following requires the removal of heat energy? I. Condensation II. Evaporation III. Melting IV. Freezing

A A I and II B B I and IV C C II and III

8. A pot of water on a hot stove begins to boil rapidly. A glass lid is placed on the pot and water droplets begin forming on the inside of the lid. What happened?

A A Water evaporates. B B Steam cools and water molecules move closer together. C C Water boils.