Physics Practice: Fluids - Pressure & Buoyancy (Mock Test 4 - Logic & Numerical)
1. If the area of the smaller piston of a hydraulic jack is $5\text{ cm}^2$ and the larger is $50\text{ cm}^2$, a force of $10\text{ N}$ on the small piston exerts a force of ________ on the large one.
2. When a solid is partially immersed in a liquid, the upthrust acts through the center of gravity of the ________.
3. Relative Density of a substance is $2.5$. What is its density in $\text{kg/m}^3$?
4. Why do camels walk easily on sand compared to horses?
5. The pressure inside a soap bubble is ________ atmospheric pressure.
6. A wooden block floats in water with $2/3$ of its volume submerged. The R.D. of wood is:
7. Pascal's Law is used in which of the following?
8. The upthrust on a body depends on the ________ of the liquid.
9. $1\text{ atmosphere (atm)}$ is equal to how many $\text{cm}$ of Mercury?
10. An egg sinks in fresh water but floats in highly salty water because salty water is ________.
11. The pressure at a depth $h$ in a liquid is $P$. At depth $2h$, the pressure (neglecting atmospheric pressure) will be:
12. A body weighs $50\text{ gf}$ in air and $42\text{ gf}$ when fully immersed in water. The upthrust is:
13. Which of the following is not a unit of pressure?
14. The weight of a body floating in a liquid is ________ the upthrust.
15. Barometer height decreases if ________.
16. The density of a substance is $7.8\text{ g/cm}^3$. Its Relative Density is:
17. A piece of wood of mass $5\text{ kg}$ floats in water. The upthrust on it is ________.
18. Pressure applied at any point of an enclosed liquid is transmitted ________ to every other point.
19. If the R.D. of a solid is less than $1$, it will ________ in water.
20. Center of Buoyancy is the center of gravity of the ________.