Physics Practice: Force (Mock Test 4 - Expert)
1. An experimental setup involves a uniform meter scale balanced at the $40 \text{ cm}$ mark when a weight of $100 \text{ gf}$ is suspended from the $5 \text{ cm}$ mark. What is the weight of the scale?
2. In a centrifuge, a particle of mass $m$ moves in a circle of radius $r$ with angular velocity $\omega$. The "pseudo force" observed from the rotating frame is:
3. A uniform circular disc of radius $R$ has a circular hole of radius $R/2$ cut out from it. If the hole is tangent to the edge, the new CG shifts by:
4. Clinical/Experimental Logic: Why is the base of a chemical balance provided with leveling screws?
5. A body is projected vertically upwards. At the highest point, the body is in:
6. Two forces of $10 \text{ N}$ and $6 \text{ N}$ act on a body. The direction of forces can be varied. The resultant force cannot be:
7. A force $F$ is applied to a body of mass $M$ at an angle $\theta$ with the horizontal. The normal reaction $R$ on a horizontal surface is:
8. The CG of a solid hemisphere of radius $r$ lies on its central radius at a distance from the flat base equal to:
9. Which experimental condition increases the sensitivity of a beam balance?
10. A planet moves around the sun in an elliptical orbit. The torque acting on the planet due to solar gravity is:
11. A uniform rod of length $L$ and weight $W$ is supported horizontally by two vertical strings at its ends. If a weight $2W$ is placed at $L/4$ from one end, the tension in the nearer string is:
12. Why is it easier to swim in sea water than in fresh water based on force logic?
13. A car of mass $m$ takes a turn on a level road of radius $r$ with speed $v$. The centripetal force is provided by:
14. If a hollow cylinder and a solid cylinder of same mass and radius are released from the top of an incline, which reaches first?
15. The ratio of gravitational unit of force to the S.I. unit of force is:
16. An object of mass $m$ is suspended from a spring balance in a lift. If the lift falls freely, the reading is:
17. A man of mass $70 \text{ kg}$ stands on a weighing scale in a lift moving upwards with acceleration $2 \text{ m/s}^2$. The reading is: ($g = 10 \text{ m/s}^2$)
18. The stability of a structure is maximum when:
19. A force $F$ is applied at the tip of a needle of area $A$. The pressure $P$ is:
20. The SI unit of stress is same as that of: