SOUND Chanpter Practice questions

Govind Padvi

 Here are 10 questions of each type for the chapter Sound:

1. Fill in the Blanks (10 Questions):

  1. Sound is produced due to __________ of an object.

  2. The unit of frequency is __________.

  3. Sound cannot travel through __________.

  4. The speed of sound is fastest in __________ and slowest in __________.

  5. The part of the ear that helps in hearing sound is __________.

  6. A __________ is an instrument used to visualize sound waves.

  7. The number of vibrations per second is called __________.

  8. A high-pitched sound has a __________ frequency.

  9. __________ is an unwanted sound that causes discomfort.

  10. The loudness of a sound depends on the __________ of vibrations.

2. Match the Following (10 Questions):

A B
Vibrations Produce sound
Frequency Number of vibrations per second
Amplitude Determines loudness
Eardrum Helps in hearing
Solids Medium where sound travels fastest
Vacuum No sound can travel
Noise Unpleasant sound
Music Pleasant sound
Echo Reflection of sound
Decibel (dB) Unit of loudness

3. True or False (10 Questions):

  1. Sound can travel through space. (_____)

  2. Sound waves need a medium to travel. (_____)

  3. The pitch of sound depends on the amplitude of vibrations. (_____)

  4. The human ear can hear all sound frequencies. (_____)

  5. The speed of sound is the same in air and water. (_____)

  6. Noise pollution can cause hearing problems. (_____)

  7. An echo is caused by the absorption of sound. (_____)

  8. A tuning fork produces sound due to vibrations. (_____)

  9. Sound can be reflected, absorbed, and transmitted. (_____)

  10. The voice of men usually has a lower pitch than women. (_____)

4. Short Answer Questions (10 Questions):

  1. How is sound produced?

  2. What are the different types of sound?

  3. What is an echo? How is it formed?

  4. Why can sound not travel in space?

  5. What is the difference between noise and music?

  6. How does sound travel in different mediums?

  7. What is the role of the eardrum in hearing?

  8. Define frequency and amplitude of sound.

  9. What are ultrasonic sounds? Where are they used?

  10. What is the speed of sound in air, water, and solids?

5. Long Answer Questions (10 Questions):

  1. Explain how pitch and loudness of sound are determined.

  2. How do musical instruments produce sound? Give examples.

  3. Explain the working of the human ear with a labeled diagram.

  4. What are the harmful effects of noise pollution? How can it be controlled?

  5. Describe the phenomenon of the reflection of sound and give examples of its applications.

  6. Why do we hear echoes? What conditions are required for an echo to be heard?

  7. Explain how sound waves are different from light waves.

  8. What is resonance? Explain with an example.

  9. How do bats use sound to find their way?

  10. Discuss the applications of sound in medicine and communication.

ANSWERS

1. Fill in the Blanks (Answers):

  1. Sound is produced due to vibrations of an object.

  2. The unit of frequency is Hertz (Hz).

  3. Sound cannot travel through vacuum.

  4. The speed of sound is fastest in solids and slowest in gases.

  5. The part of the ear that helps in hearing sound is eardrum.

  6. A oscilloscope is an instrument used to visualize sound waves.

  7. The number of vibrations per second is called frequency.

  8. A high-pitched sound has a high frequency.

  9. Noise is an unwanted sound that causes discomfort.

  10. The loudness of a sound depends on the amplitude of vibrations.

2. Match the Following (Answers):

A B
Vibrations Produce sound
Frequency Number of vibrations per second
Amplitude Determines loudness
Eardrum Helps in hearing
Solids Medium where sound travels fastest
Vacuum No sound can travel
Noise Unpleasant sound
Music Pleasant sound
Echo Reflection of sound
Decibel (dB) Unit of loudness

3. True or False (Answers):

  1. Sound can travel through space. (False)

  2. Sound waves need a medium to travel. (True)

  3. The pitch of sound depends on the amplitude of vibrations. (False)

  4. The human ear can hear all sound frequencies. (False)

  5. The speed of sound is the same in air and water. (False)

  6. Noise pollution can cause hearing problems. (True)

  7. An echo is caused by the absorption of sound. (False)

  8. A tuning fork produces sound due to vibrations. (True)

  9. Sound can be reflected, absorbed, and transmitted. (True)

  10. The voice of men usually has a lower pitch than women. (True)

4. Short Answer Questions (Answers):

  1. How is sound produced?

    • Sound is produced when an object vibrates, creating waves that travel through a medium like air, water, or solids.

  2. What are the different types of sound?

    • Sound can be classified into audible sound (20 Hz – 20,000 Hz), infrasonic sound (< 20 Hz), and ultrasonic sound (> 20,000 Hz).

  3. What is an echo? How is it formed?

    • An echo is the reflection of sound when it bounces off a hard surface and returns to the listener after a delay.

  4. Why can sound not travel in space?

    • Space is a vacuum, and sound requires a medium (like air, water, or solids) to propagate.

  5. What is the difference between noise and music?

    • Noise is an unpleasant, irregular sound, whereas music is a pleasant, organized sound with rhythm and harmony.

  6. How does sound travel in different mediums?

    • Sound travels fastest in solids, slower in liquids, and slowest in gases because particle density affects wave propagation.

  7. What is the role of the eardrum in hearing?

    • The eardrum vibrates when sound waves hit it, transmitting these vibrations to the inner ear for interpretation.

  8. Define frequency and amplitude of sound.

    • Frequency is the number of vibrations per second (measured in Hz). Amplitude is the height of sound waves and determines loudness.

  9. What are ultrasonic sounds? Where are they used?

    • Ultrasonic sounds are frequencies above 20,000 Hz. They are used in medical imaging (ultrasound) and sonar systems.

  10. What is the speed of sound in air, water, and solids?

    • In air: ~343 m/s, in water: ~1,480 m/s, in solids: ~5,000 m/s (varies by material).

5. Long Answer Questions (Answers):

  1. Explain how pitch and loudness of sound are determined.

    • Pitch depends on the frequency of sound waves; higher frequency means higher pitch.

    • Loudness depends on the amplitude of sound waves; higher amplitude means louder sound.

  2. How do musical instruments produce sound? Give examples.

    • Musical instruments produce sound by vibrating strings (guitar), air columns (flute), or membranes (drums).

  3. Explain the working of the human ear with a labeled diagram.

    • The human ear consists of the outer ear (collects sound), middle ear (amplifies sound via ossicles), and inner ear (converts vibrations into nerve signals for the brain).

  4. What are the harmful effects of noise pollution? How can it be controlled?

    • Effects: Hearing loss, stress, sleep disturbance.

    • Control: Using soundproofing, reducing vehicle honking, regulating industrial noise.

  5. Describe the phenomenon of the reflection of sound and give examples of its applications.

    • When sound waves hit a surface and bounce back, it is called reflection. Applications: Sonar, stethoscopes, auditorium design.

  6. Why do we hear echoes? What conditions are required for an echo to be heard?

    • Echoes occur when reflected sound reaches the ear after at least 0.1 seconds. The reflecting surface should be hard and at least 17 meters away.

  7. Explain how sound waves are different from light waves.

    • Sound waves: Require a medium, are longitudinal.

    • Light waves: Travel in a vacuum, are transverse.

  8. What is resonance? Explain with an example.

    • Resonance occurs when one vibrating object makes another object vibrate at its natural frequency. Example: A tuning fork making another tuning fork vibrate.

  9. How do bats use sound to find their way?

    • Bats use echolocation, emitting ultrasonic sounds and interpreting the reflected waves to detect obstacles and prey.

  10. Discuss the applications of sound in medicine and communication.

  • Medicine: Ultrasound scans for imaging organs, detecting pregnancy.

  • Communication: Mobile phones, radio, and TV transmit sound via waves.

This covers all 50 answers from the Sound chapter.