Physics Practice: Physical Quantities and Measurement (Mock Test 3 - Advanced)
1. Why does the density of a substance usually decrease when it is heated?
2. How can you determine the Relative Density of a solid that is lighter than water (floats)?
3. What is the anatomical purpose of the capillary tube in the stopper of a Relative Density bottle?
4. Why is the density of water maximum at 4°C?
5. If the Relative Density of an alloy is 8.0, what will be the mass of $2 \text{ m}^3$ of this alloy?
6. A body weighs $50 \text{ gf}$ in air and $42 \text{ gf}$ when completely immersed in water. The upthrust acting on it is:
7. Which principle explains why it is easier to swim in sea water than in fresh water?
8. When a solid is weighed in a liquid of density $\rho_l$, its apparent weight loss depends on:
9. If a body floats with $\frac{1}{4}$ of its volume above the surface of water, its Relative Density is:
10. Why do hot air balloons rise in the atmosphere?
11. A density bottle weighs $30 \text{ g}$ empty, $55 \text{ g}$ with water, and $50 \text{ g}$ with oil. The R.D. of oil is:
12. Which mechanism explains why an iron ship does not sink?
13. How does the upthrust on a body change if it is taken deeper into a liquid (assuming it's already fully submerged)?
14. The S.I. unit of volume is $\text{m}^3$. How many $\text{cm}^3$ are there in $1 \text{ m}^3$?
15. What is the Relationship between Density ($\rho$), Mass ($M$), and Volume ($V$)?
16. Why is mercury used in thermometers despite its high density?
17. A piece of wood of RD 0.8 floats in water. The fraction of volume submerged is:
18. If the density of a body is exactly equal to the density of the liquid, it will:
19. Density of a substance depends on its:
20. What is the S.I. unit of Upthrust?
