Physics Practice: Fluids - Advanced Concepts & Applications (Mock Test 3)
1. The pressure at the bottom of a lake depends on the density of liquid, acceleration due to gravity, and ________.
2. When a piece of ice floating in a glass of water melts, the level of water in the glass ________.
3. A body floats in a liquid with a part of it submerged. The weight of the displaced liquid is ________ the weight of the body.
4. The S.I. unit of Upthrust is ________.
5. For a body to float, its center of buoyancy should ideally be ________ its center of gravity for stable equilibrium.
6. If the density of a body is $800\ kg/m^3$ and it is placed in water ($1000\ kg/m^3$), the body will ________.
7. A hydraulic brake works on the principle of ________.
8. Atmospheric pressure is approximately $10^5\ Pa$. Why doesn't it crush our bodies?
9. The R.D. of a substance is 0.6. It will float in ________.
10. As a ship moves from a river into the sea, it ________.
11. A standard barometer reading is $76\ cm\ of\ Hg$. This is equivalent to ________.
12. Upthrust on a body ________ if the volume of the submerged part increases.
13. Which of the following is a unit of thrust?
14. To increase pressure without changing force, one should ________.
15. A balloon filled with hydrogen rises because upthrust is ________ its weight.
16. Density of Mercury is $13.6\ g/cm^3$. Its Relative Density is ________.
17. In a hydraulic jack, a small force on a small piston produces a ________ force on a large piston.
18. Why does an iron needle sink in water?
19. The R.D. of a substance is 7.8. What will be its mass if its volume is $2\ cm^3$? (Density of water = $1\ g/cm^3$)
20. The apparent weight of a body floating in a liquid is ________.