NEET Physics: Waves and Sound questions with solutions

Q1. Sound is produced by vibration. Define vibration.

1. Vibration is a rapid to and fro motion of the object.
2. Vibration is a circular motion of the object.
3. Vibration is a translational motion of the object.
4. None of the above

Answer: Vibration is a rapid to and fro motion of the object.

Vibration means an object moves quickly back and forth about its resting position. This repeated to-and-fro motion is what produces sound.

Q2. Every source of sound has to be a body

1. vibrating
2. resting
3. climbing
4. elastic

Answer: vibrating

A sound source must be vibrating because sound is produced when an object oscillates and creates pressure waves in a medium. A resting, climbing, or merely elastic body does not necessarily produce sound.

Q3. A rubber string is tied to a nail on the wall. The rubber string is pulled gently to stretch slightly. Which of the following phenomena may occur after the release of the string?

1. Sound is produced
2. Rubber string moves up and down
3. The quality of sound changes with the tension of the string
4. All the above happen

Answer: All the above happen

When the stretched rubber string is released, it can vibrate, producing sound. Those vibrations may include up-and-down motion, and the sound quality changes as the tension changes because tension affects vibration behavior.

Q4. With the length of vocal chord, voice quality

1. changes
2. remains same
3. may or may not change
4. remains same but loudness changes

Answer: changes

Vocal cord length affects the frequency and resonance of vibration, which changes voice quality. As the length changes, the produced voice becomes different rather than remaining the same.