19.5 Damped Oscillation

1.            Which of the following statements about a critical damping system is true?

• No energy is lost from the system.

• Only a few oscillations are possible.

• The system takes an infinite time to return to equilibrium.

• The system does not oscillate but returns easily to its equilibrium position.

2. 2. Which statement is true of a critically damped oscillation?

• The system undergoes a few oscillations before it stops.

• The system returns to rest at the equilibrium position slowly.

• The system undergoes exponential drop in amplitude when oscillating.

• The system returns to rest at the equilibrium position in the shortest time.

3. 3. Which statement is not true when an oscillatory system is in critical damping?

• The displacement decreases with time.

• The system will stop after a few oscillations.

• The system will stop in the shortest possible time.

• The total energy of the system decreases with time.

4. 4. Which statement is not true about damped oscillation?

• In all damped oscillations, some of the mechanical energy is lost as heat.

• In an over damped oscillation, the object oscillates for a very long period.

• In an under damped oscillation, the object oscillates with decreasing amplitude.

• In a critically damped oscillatory system, the object moves to the equilibrium position in the shortest possible time and stops.

5. 5. When a body that undergoing simple harmonic oscillation experiences light damping, the quantity that experiences the least change due to the damping is

• the speed of the body

• the acceleration of the body

• the oscillation amplitude of the body

• the oscillation frequency of the body

6. 6. The graph below shows the variation of amplitude with frequency for a system undergoing forced oscillation in three cases, i.e underdamping, critical damping and overdamping. What types of damping are represented by curves I, II and III?

• Underdamping I

  Critical Damping II

  Overdamping III

• Underdamping II

  Critical Damping I

  Overdamping III

• Underdamping III

  Critical Damping I

  Overdamping II

• Underdamping III

  Critical Damping II

  Overdamping I