Class XI

As a ball rises the vertical component of its velocity
  1. increases
  2. Cannot be determined
  3. remains the same
  4. decreases
One radian is defined to be the angle subtended where the arc length S is exactly equal to the?
  1. radius of the circle.
  2. diameter of the circle.
  3. circumference of the circle.
  4. half of radius of the circle.
Kicked or thrown balls, jumping animals, object thrown from a window, a missile shot from a gun, a bomb released from a bomber plane, etc are all example of?
  1. Mechanical energy
  2. Projectiles
  3. Velocity
  4. Machine
The work done by the centripetal force is always?
  1. positive
  2. None of these
  3. Negative
  4. Zero
A car of mass 800 kg moves on a circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is
  1. 8 m/s
  2. 14 m/s
  3. 12 m/s
  4. 7 m/s
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