NEET Physics Chapter 5 Sound Questions And Answers

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NEET Physics  Chapter 5 Sound Questions And Answers

Question 1. Define sound.
Answer:

Sound:

A sound is a form of energy that propagates from one place to another through a medium.

Question 2. How is the sound produced?
Answer:

Sound is produced when an object vibrates. Vibration is the rapid to and fro motion of an object.

Question 3. Sound is a form of energy. Explain.
Answer:

Sound is a form of energy:

Mechanical energy is required to start vibrations in an object producing sound. The vibrations of objects are transmitted in a medium in waveforms from one point to the next and so on. These waves on reaching our ears produce vibrations in the eardrum which are perceived as sound by us. Thus, sound is a form of energy.

NEET Physics Chapter 5 Sound Questions And Answers

Question 4. Sound cannot be produced in a body if it’s not vibrating. (True/False)
Answer. True

Question 1. Describe various uses of multiple reflections of sound.
Answer:

Various uses of multiple reflections of sound:

Multiple reflections of sound are used to measure the depth of the sea or ocean. It is also used to detect the position of objects for example sea rocks, hidden icebergs in the sea, and ocean shipwrecks. It is also used to investigate problems inside the human body.

Question 5. What is the range of hearing of a human being?
Answer:

Range of hearing of human being:

The range of hearing of a human being is the sound of frequency between 20 Hz to 20000 Hz.

Question 6. Define infrasonic and ultrasonic sounds.
Answer:

Infrasonic and ultrasonic sounds:

The sound of frequency less than 20 Hz is called infrasonic sound while the sound of frequency greater than 20 kHz is called ultrasonic sound.

Question 7. What are the additional properties of ultrasound?
Answer:

The additional properties carried by ultrasound are:

  • The energy carried is very high.
  • It can travel along a well-defined straight path. It does not bend appreciably at the edges of the obstacle because of its small wavelength.

Question 8. What are the various applications of ultrasound?
Answer:

The various applications of ultrasound are:

  • Bats avoid obstacles in their path by producing and hearing the ultrasound.
  • It is used in drilling holes and making cuts of desired shape in the glass.
  • It is used in cleaning very small objects like parts of watches or other electronic items.
  • It is used for the detection of defects in the metals.
  • It is widely used for imaging of human organs.
  • It is used in human surgery to remove cataracts and in kidneys to break the stone into fine grains.
  • It is used in SONAR (Sound navigation and ranging)

Question 9. A sound source sends waves of 400 Hz. It produces waves of wavelength 2.5 m. What is the velocity of sound waves?
Answer. 1000 m/s

Question 10. The period of a vibrating body is 0.05  s. What is the frequency of waves that it emits?
Answer. 20 Hz

Question 11. A bat can hear the sound of frequencies up to 120 kHz. Determine the minimum wavelength of sound that it can hear. The speed of sound in air is 344 m/s.
Answer. 2.867 x 10-3 m

Question 12. A wave pulse of frequency 200 Hz, on a string, moves a distance of 8 m in 0.05 s. Calculate the wavelength of the wave on a string.
Answer. 0.8 m

Question 13. If the velocity of sound in air is 340 m/s and the frequency is 256 Hz. What will be the wavelength?
Answer. 1.25 m

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