Physics Practice: Force and Pressure (Mock Test 3 - Advanced)
1. Why is it difficult to open a door by pushing it near the hinges?
2. How does the pressure at a point inside a liquid change if the density of the liquid is tripled?
3. A hydraulic jack works on the principle that ________ applied to a fluid is transmitted equally.
4. Why do our ears "pop" when we travel to high altitudes or fly in an airplane?
5. Which of the following mechanisms explains why a fountain pen leaks at high altitudes?
6. A person of mass $60\ \text{kg}$ stands on an area of $0.03\ \text{m}^2$. Calculate the pressure ($g = 10\ \text{m/s}^2$).
7. The total pressure at the bottom of a lake is the sum of ________ and liquid pressure.
8. Why is the wall of a dam thicker at the bottom than at the top?
9. A nut is opened by a wrench of length $10\ \text{cm}$. If a $5\ \text{N}$ force is required, what length wrench would require only $2.5\ \text{N}$?
10. Blood pressure in humans is measured using a ________.
11. In the formula $P = h \rho g$, the term '$\rho$' (rho) stands for:
12. Why do camels walk easily on sand while horses struggle?
13. A body is in equilibrium when the sum of anticlockwise moments equals the sum of ________.
14. What is the approximate value of standard atmospheric pressure in $\text{cm of Hg}$?
15. Why does a rubber sucker stick to a smooth surface?
16. Pressure in a liquid does not depend on which of the following?
17. A see-saw is a practical example of:
18. To calculate Torque, force must be multiplied by ________ distance from the axis.
19. If the area of contact is doubled, the pressure for the same force will:
20. What is the approximate value of atmospheric pressure acting on a human body?
