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Federal (FBISE) · Chapter test · Free

1st Year Physics Chapter 4 Test04. Rotational and Circular Motion

30 marks · 40 minutes · 21 questions. Covers: 04. Rotational and Circular Motion.

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1st Year Physics Chapter 4 Test

1st Year · Physics · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. If size (length) of the wings of a fan is increased, its rotational speed, for the same voltage and current, will
    1. increase
    2. decrease
    3. may increase or decrease
    4. remain constant
  2. Angular momentum for a rigid body is:
    1. L = Iω
    2. L = Iα
    3. L = mω
    4. L = mv²
  3. The term mr² represents:
    1. Torque
    2. Angular momentum
    3. Moment of inertia
    4. Linear inertia
  4. 1 radian is equal to:
    1. 90°
    2. 180°
    3. 57.3°
    4. 360°
  5. On a frictionless banked road, centripetal force is provided by:
    1. Friction
    2. Weight
    3. Normal force
    4. Air resistance
  6. Centripetal acceleration direction is always:
    1. Tangential to the circle
    2. Away from center
    3. Toward the center
    4. Downward
  7. Radial (centripetal) acceleration is:
    1. ar = v²/r
    2. ar = r²ω
    3. ar = rω²
    4. Both a and c
  8. In artificial gravity, the centripetal acceleration formula is:
    1. ac = vR
    2. ac = v²/R
    3. ac = R/v²
    4. ac = g/v
  9. The time rate of change of angular velocity is called:
    1. Angular displacement
    2. Angular motion
    3. Angular acceleration
    4. Angular speed
  10. Torque is equal to:
    1. r × v
    2. r × p
    3. r × F
    4. m × a

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. What are two ways weightlessness can be achieved?
  2. Write the relation between linear and angular velocity.
  3. Define weightlessness.
  4. What provides centripetal force in a car turning on an unbanked road?
  5. Define torque in terms of angular momentum.
  6. What is rotational inertia?
  7. State the formula for centripetal acceleration used in artificial gravity.
  8. State the condition for safe speed on a frictionless banked road.

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. What will be the angular velocity of fly wheel of an engine if it travels 3000 revolutions in a minute?
  2. A merryman in a circus is standing with his arms extended on a turn table rotating with angular velocity 10 rad/s. He brings his arms closer to his body so that his moment of inertia is reduced to one third of the initial value. Find his new angular velocity.
  3. A wheel shape space station provides an artificial gravity of 5.00 m/s² to its inhabitants. If it has a diameter of 100 m, find its angular speed in rpm.