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NCERT solutions for Class 8 Science chapter 13 - Sound

Science Textbook For Class 8

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Chapters

NCERT Science Class 8

Science Textbook For Class 8

Chapter 13: Sound

Chapter 13: Sound solutions [Pages 168 - 169]

Q 1 | Page 168

Choose the correct answer.

Sound can travel through

  • gases only

  • solids only

  • liquids only

  • solids, liquids and gases.

Q 2 | Page 168

Which of the following voices is likely to have minimum frequency?

  • Baby girl

  • Baby boy

  • A man

  • A woman

Q 3.1 | Page 169

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

Sound cannot travel in vacuum. (T / F)

  • True

  • False

Q 3.2 | Page 169

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

The number of oscillations per second of a vibrating object is called its time period. (T / F)

  • True

  • False

Q 3.3 | Page 169

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

If the amplitude of vibration is large, sound is feeble. (T / F)

  • True

  • False

Q 3.4 | Page 169

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

For human ears, the audible range is 20 Hz to 20,000 Hz. (T / F)

  • True

  • False

Q 3.5 | Page 169

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

The lower the frequency of vibration, the higher is the pitch. (T / F)

  • True

  • False

Q 3.6 | Page 169

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

Unwanted or unpleasant sound is termed as music. (T / F)

  • Ture

  • False

Q 3.7 | Page 169

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

Noise pollution may cause partial hearing impairment. (T/F)

  • True

  • False

Q 4.1 | Page 169

Fill in the blanks with suitable words.

Time taken by an object to complete one oscillation is called _________.

Q 4.2 | Page 169

Fill in the blanks with suitable words.

Loudness is determined by the ________ of vibration.

Q 4.3 | Page 169

Fill in the blanks with suitable words.

The unit of frequency is _________.

Q 4.4 | Page 169

Fill in the blanks with suitable words.

Unwanted sound is called _________.

Q 4.5 | Page 169

Fill in the blanks with suitable words.

Shrillness of a sound is determined by the _________ of vibration

Q 5 | Page 169

A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

Q 6 | Page 169

The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

Q 7.1 | Page 169

Identify the part which vibrates to produce sound in the following instrument.

Dholak

Q 7.2 | Page 169

Identify the part which vibrates to produce sound in the following instrument

Sitar

Q 7.3 | Page 169

Identify the part which vibrates to produce sound in the following instrument

Flute

Q 8 | Page 169

What is the difference between noise and music? Can music become noise sometimes?

Q 9 | Page 169

List sources of noise pollution in your surroundings.

Q 10 | Page 169

Explain in what way noise pollution is harmful to humans.

Q 11 | Page 169

Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest your parents should buy? Explain your answer.

Q 12 | Page 169

Sketch larynx and explain its function in your own words.

Q 13 | Page 169

Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain?

Chapter 13: Sound

NCERT Science Class 8

Science Textbook For Class 8

NCERT solutions for Class 8 Science chapter 13 - Sound

NCERT solutions for Class 8 Science chapter 13 (Sound) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Science Textbook For Class 8 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 8 Science chapter 13 Sound are Sound - Produced by a Vibrating Body, Sound Produced by Humans, Sound Needs a Medium for Propagation, Hear Sound Through Our Ears, Amplitude, Time Period and Frequency of a Vibration, Audible and Inaudible Sounds, Noise and Music, Noise Pollution.

Using NCERT Class 8 solutions Sound exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 8 prefer NCERT Textbook Solutions to score more in exam.

Get the free view of chapter 13 Sound Class 8 extra questions for Science and can use Shaalaa.com to keep it handy for your exam preparation

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