NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


A ball is moving in a circular path of radius 5 m. If tangential acceleration at any instant is 10 m/s and the net acceleration makes an angle 30° with the centripetal acceleration, then the instantaneous speed is

  • 503m/s

  • 9.3m/s

  • 6.6m/s

  • 5.4m/s


A spherical solid ball of mass 1 kg and radius 3 cm is rotating about an axis passing through its centre with an angular velocity of 50 rad/s. The kinetic energy of rotation is

  • 4500J

  • 90J

  • 910J

  • 0.45J


4. The moment of inertia of a thin spherical shell of mass M and radius R about a diameter is23MR2. Its radius of gyration K about a tangent will be

  • 23R

  • 23R

  • 53R

  • 53R


A body weighs 200 N at the surface of earth. If it be placed in an artificial satellite revolving at height where acceleration due to gravity is half of that at earth's surface. It will weigh

  • 100N

  • 200N

  • 400N

  • Zero


A wire suspended vertically from one of its ends is stretched by attaching a weight of 200 N to the lower end. The weight stretches the wire by 1 mm. Then the elastic energy stored in the wire is

  • 20 J

  • 0.1 J

  • 0.2 J

  • 10 J


Certain neutron stars are believed to be rotating at about 1 rev/s. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be

  • 20 ×108 m/s2

  • ×105 m/s2

  • 120× 105 m/s2

  • × 108 m/s2


In planetary motion, the areal velocity of position vector of a planet depends on angular velocity (ω) and distance of the planet from the sun (r). If so the correct relation for areal velocity is

  • dAdt  ωr

  • dAdt  ω2r

  • dAdt  ωr2

  • dAdt  ωr


Two springs of force constant 1000 N/m and 2000 N/m are stretched by same, force. The ratio of their respective potential energies is

  • 2 : 1

  • 1 : 2

  • 4 : 1

  • 1 : 4


A particle rests on the top of a hemisphere of radius R. Find the smallest horizontal velocity that must be imparted to the particle, if it is to leave the hemisphere without sliding down it.

  • gR

  • 2gR

  • 3gR

  • 5gR


The moment of inertia of a body about a given axis is 1.2 kg-m2. Initially, the body is at rest. In order to produce rotational kinetic energy of 1500 J, angular acceleration of 25 rad/s2 must be applied about the axis for a duration of

  • 4s

  • 2s

  • 8s

  • 10s