NCERT CLASS 11 PHYSICS CHAPTER 13 – OSCILLATIONS IN-TEXT / CONCEPT-BASED QUESTIONS AND ANSWERS 1. What is periodic motion? Answer: Periodic motion is a type of motion in which an object repeats its motion after equal intervals of time. The time taken to complete one cycle is called the time period. Examples: Motion of the Earth around the Sun. Motion of the hands of a clock. Oscillation of a simple pendulum. 2. What is oscillatory motion? Answer: Oscillatory motion is the repeated to-and-fro motion of an object about its mean or equilibrium position. Examples: Motion of a simple pendulum. Motion of a mass attached to a spring. Vibrations of a tuning fork. 3. Differentiate between periodic motion and oscillatory motion. Answer: Periodic motion: Motion that repeats itself after equal intervals of time. It may be circular, rotational or oscillatory. Example: Revolution of the Earth around the Sun. Oscillatory motion: Motion in which an object moves repeatedly to and fro about a mean...