Important Questions of Laws of Motion Physics | Zigya

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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


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


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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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