1. Rice grains getting cooked in a rice cooker undergo a _____.

2. Analogy based question:
Dissolving Sugar in Water : Physical Change :: Baking Bread : _______.

3. Classify each of the following as a physical or chemical change:

(i) Drying wet clothes in the sun

(ii) Vinegar reacting with baking soda

(iii) Cutting a piece of paper into shapes

(iv) Iron nail rusting

(v) Dissolving sugar in tea

Options:

4. Which of the following correctly lists the steps in making roti and identifies the type of change occurring at each step?

5. Glowing of electric bulb involves ______.(Olympiad)

6. What happens during the freezing of water? (Application in New Contexts)

7. A student folds a sheet of paper to make a paper airplane (Process I) and then tears the paper to create confetti (Process II). Which of the following statements is correct?

8. In the realm of material science, the _____ and _____ of materials due to temperature variations play a crucial role, as seen in practical applications like the design of _____, which have gaps to accommodate thermal expansion.

9. In everyday life, the _____ of materials due to temperature changes is commonly observed, such as in the slight _____ of metal jar lids in hot water, making them easier to open, or the _____ of railway tracks in summer.

10. A metal jar lid is often hard to open. Ravi's mother dipped the lid in hot water for a minute and then easily opened the jar. What is happening to the metal lid when it is dipped in hot water?