Physics Practice: Force and Pressure (Mock Test 4 - Expert)
1. Expert Analysis: Why do deep-sea fish explode or suffer severe internal damage when brought rapidly to the ocean surface?
2. In a hydraulic press, a force $F_1$ is applied on a piston of area $A_1$. The force $F_2$ produced on a larger piston of area $A_2$ is calculated by:
3. Clinical Logic: Why is a sharp injection needle used for vaccination instead of a thicker one?
4. Data-based: A barometer reading drops suddenly. What does this experiment-based observation typically indicate?
5. A uniform meter scale is balanced at its center (50 cm mark). If a weight of $50\ \text{gf}$ is hung at the 10 cm mark, what weight must be hung at the 90 cm mark to maintain equilibrium?
6. Why does the blood pressure in our veins not cause them to collapse under atmospheric pressure?
7. In a Fortin’s Barometer, the leather cup at the bottom is adjusted using a screw to:
8. A cube of side $10\ \text{cm}$ and mass $5\ \text{kg}$ is placed on a table. Calculate the pressure in S.I. units ($g = 10\ \text{m/s}^2$).
9. Which factor explains why a broad base for a heavy machine prevents it from sinking into the floor?
10. The vacuum created above the mercury column in a simple barometer is called:
11. Why is an Aneroid Barometer preferred over a Mercury Barometer for travelers?
12. If a force is applied at an angle other than $90^\circ$ to the lever arm, the moment of force will:
13. The hydraulic brakes in a car work because:
14. What happens to the atmospheric pressure reading if a small amount of air enters the barometer tube?
15. Why is water not suitable for use in a barometer to measure atmospheric pressure?
16. The center of gravity of a symmetric body (like a circle) is always at its:
17. Siphon action (used to empty tanks) works because of the ________ difference between two levels.
18. A force of $10\ \text{N}$ produces a moment of $5\ \text{N m}$. Calculate the perpendicular distance.
19. If a body is rotated by a pair of equal and opposite forces not acting along the same line, it is called a:
20. The magnitude of buoyant force (upthrust) depends on the ________ of the liquid.
