Physics: Mechanics
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Physics: Mechanics
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25 Questions

1. A ball moving with uniform velocity comes to rest in a distance of 72 m in 6 s. Its initial velocity and retardation are
2. Pick out the vector quantity
3. A block of mass m is pulled along a surface as shown. The coefficient of kinetic friction between the block and the surface is m and the tension in the rope is T. The acceleration of the block is
4. With increase of temperature, the frictional force acting between two surfaces
5. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that
6. A cyclist moves due east at 8 km/h for half an hour and then turns exactly southwards for another half an hour at 6 km/h. The average velocity of the cyclist for the period is
7. A block of wood is floating in a lake. The apparent weight of the floating block is
8. Choose the only scalar quantity from the following:
9. A small mass is placed on a turntable that is rotating at 45 r.p.m. The acceleration of the mass is
10. A magnetic needle is kept in a non-uniform management field. It experiences
11. The fl ying of birds is a proof of Newton's
12. A car and lorry are both moving with equal kinetic energy. If equal breaking force is applied on both, then before coming to rest the
13. If the distance between two charges is halved, then the force between them becomes
14. An object moving around in a circle is moving with a
15. Railway tracks are banked on curves so that
16. A force of 12 N is applied to two packing cases on a frictionless horizontal surface as shown in figure. The force that each case exerts on the other is
17. A body that is moving with uniform acceleration covers 200 m in the first 2 s and 220 m in the next 4 s. The velocity in m/s after 7 s is
18. When milk is churned, the cream from it is separated due to
19. A particle of mass m moves in a circular path of radius r at constant speed v. Its KE is
20. If a bomb is released from a plane moving with uniform velocity, then by the time the bomb reaches the ground, the plane will be
21. The horse pulls the cart because of
22. A moving body on Earth ordinarily comes to rest by itself because of the
23. A moving bullet hits a solid target resting on a frictionless surface and gets embedded in it. What is conserved in this process?
24. Which of the following statement is incorrect?
25. A motor running on electricity at the rate of 400 W raises a block of weight 120 N. If the block moves 8 m vertically in 4 s, the efficiency of the motor is