1:   The mass and length of a thin uniform rod are M and L respectively. Its moment of inertia about an axis making angle of 90 degree with its length is ML2/I. The distance of axis from the mid point of the rod will be
Options:
  1. L/6
  2. L/3
  3. L/2
  4. L/9

Answer: Option 1

Explanation:

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2:   Ther moment of inertia of a disc about its own axis is I. Its moment of inertia about a tangent in its plane will be
Options:
  1. 5I/2
  2. 3I
  3. 3I/2
  4. 5I

Answer: Option 1

Explanation:

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3:   A solid sphere of mass M and radius R is rolling without slipping with a velocity V on a horizontal surface. The ratio of its rotational and translational kinetic energies will be
Options:
  1. 2:5
  2. 5:2
  3. 2:7
  4. 7:2

Answer: Option 1

Explanation:

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4:   A wheel is revolving about its axis at the rate of 900 rpm. If the source of power rotating it is removed then it stops in 1 minutes. The angular retardation (in rad/s2) of the wheel is
Options:
  1. pi/2
  2. pi/4
  3. pi/6
  4. none of these

Answer: Option 1

Explanation:

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5:   When external torque acting on a system is zero, then this remains conserved
Options:
  1. linear momentum
  2. angular momentum
  3. both the above
  4. total energy

Answer: Option 2

Explanation:

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6:   A thin rod of length L and mass M is bent at 90 degree from its mid point. The M.I. of the bent rod about an axis passing through the bent and perpendicular to the plane formed by two parts
Options:
  1. ML2/24
  2. ML2/12
  3. ML2/6
  4. none of these

Answer: Option 2

Explanation:

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7:   A diver curls his body before jumping into water so as to
Options:
  1. increase moment of inertia
  2. decrease moment of inertia
  3. decrease angular momentum
  4. none of these

Answer: Option 2

Explanation:

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8:   the angular acceleration of a disc is 3 rad/s2 and initial angular speed is 2 rad/s. The value of its rotations (in rad) after 2 sec. will be
Options:
  1. 6
  2. 10
  3. 12
  4. 8

Answer: Option 2

Explanation:

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9:   The mass and radius of a disc are M and r, the M.I. of disc about an axis touching its edge and lying in the same plane will be
Options:
  1. 5Mr2/4
  2. mr2/4
  3. 3mr2/2
  4. none of these

Answer: Option 1

Explanation:

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10:   A drum of radius R and mass M slides without slipping on an inclined plane. Force of friction
Options:
  1. converts translational energy into rotational energy
  2. produces energy loss in the form of heat
  3. decrease rotational motion
  4. all the above

Answer: Option 1

Explanation:

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