A passenger getting down from a moving bus, falls in the directio

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 Multiple Choice QuestionsMultiple Choice Questions

51.

A particle tied to a string describes a vertical circular motion of radius r continually. If it has a velocity 3gr at the highest point, then the ratio of the respective tensions in the string holding it at the highest and lowest points is

  • 4 : 3

  • 5 : 4

  • 1 : 4

  • 3 : 2


52.

The potential energy of a conservative system is given by V(x) = (x2 − 3x) joule, where x is measured in metre. Then its equilibrium position is at

  • 1.5 m

  • 2 m

  • 3 m

  • 1 m


53.

Two bodies of masses 4 kg and 9 kg are separated by distance of 60 cm. A 1 kg mass is placed in between these two masses. If the net force on 1 kg is zero, then its distance from 4 kg mass is

  • 26 cm

  • 30 cm

  • 24 cm

  • 32 cm


54.

Two spherical rain drops with radii in the ratio 1 : 2 fall from a great height through the atmosphere. The ratio of their momenta after they have attained terminal velocity is

  • 1 : 8

  • 2 : 1

  • 1 : 32

  • 1 : 2


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55.

The sum of magnitudes of two forces acting at a point is 16 N and their resultant 83 N is at 90° with the force of smaller magnitude. The two forces (in N) are

  • 11, 5

  • 9, 7

  • 2, 14

  • 4, 12


56.

Among the following, the vector quantity is

  • pressure

  • gravitation potential

  • stress

  • impulse


57.

A particle of mass m is moving in a horizontal circle of radius r, under a centripetal force F = kr2, where k is a constant.

  • The potential energy of the particle is zero

  • The potential energy of the particle is kr

  • The total energy of the particle is -k2r

  • The kinetic energy of the particle is - kr


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58.

A passenger getting down from a moving bus, falls in the direction of the motion of the bus. This is an example for

  • moment of inertia

  • second law of motion

  • inertia of motion

  • inertia of rest


C.

inertia of motion

Due to inertia of motion upper part of body continues to be in motion in forward direction, while feet come to rest as soon as they touch the road.


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59.

A body of mass 6 kg is hanging from another body of mass 10 kg as shown in figure. This combination is being pulled up by a string with an acceleration of 2 ms-2. The tension T1 is, (g =10 ms-2)

  • 240 N

  • 150 N

  • 220 N

  • 192 N


60.

Which one of the following is not a contact force ?

  • Viscous force

  • Air resistance

  • Magnetic force

  • Buoyant force


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