1. In an experiment to demonstrate the "discontinuous nature of matter," a crystal of Potassium Permanganate is placed in water. What is the primary observation?
2. When 50 ml of salt is added to 100 ml of water, the level of water hardly changes. This experiment proves that:
3. Two glass plates with a drop of water between them are very difficult to pull apart. This is due to:
4. Why does a gas jar filled with air placed upside down over a jar of brown Bromine vapour become completely brown after some time?
5. In a laboratory, if you heat a substance and its temperature stays at 78°C while it turns from liquid to gas, 78°C represents its:
6. To observe Brownian motion under a microscope, which experimental setup is best?
7. A balloon filled with Hydrogen gas eventually shrinks because:
8. If you spray perfume in one corner of a room, the smell reaches the other corner because:
9. Which observation contradicts the idea that molecules are at rest?
10. When Iodine crystals are heated in a test tube, violet vapours are seen without any liquid formation. This experiment demonstrates:
11. A syringe filled with air is easier to compress than one filled with water. This is because:
12. In the "bell jar" experiment, as air is removed, the sound of a bell inside fades. This proves air is matter because:
13. Which setup would show the fastest rate of diffusion?
14. When two droplets of mercury are brought close to each other, they instantly snap together to form one. This is a direct evidence of:
15. Why does an iron nail sink in water while a piece of wood floats? (In terms of matter density):
16. If we compress a gas in a cylinder with a piston, the inter-molecular space ________ while the inter-molecular force ________.
17. Water wets the glass surface while mercury does not. This is because:
18. The fact that matter can be compressed suggests that:
19. In a "Cooling Curve" graph, the flat horizontal portions indicate:
20. What is the effect of increasing the "Mass" of a body on its inertia?
