SEBA Class 8 Science Important Chapter 14 Sound

SEBA Class 8 Science Important Chapter 14 Sound Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 8 General Science Download PDF. Important Notes for Class 8 Science SCERT.

SEBA Class 8 Science Important Chapter 14 Sound

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 8 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 8 General Science Important Notes for All Chapters, You can practice these here.

Sound

Chapter: 14

PART – II

IMPORTANT QUESTION ANSWER

A. Very Short Type Question & Answer:

1. What is sound?

Ans. Sound is a form of energy that is produced by vibrating bodies and travels through a medium to reach our ears.

2. What are vocal cords?

Ans. Vocal cords are thin membranes in the voice box that vibrate to produce sound when air passes through them.

3. What is noise pollution?

Ans. The presence of excessive or unwanted sounds in the environment is called noise pollution.

4. State the unit of frequency.

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

5. What is the range of audible sound for humans?

Ans. Humans can hear sounds in the frequency range of 20 Hz to 20,000 Hz.

B. Fill in the Blanks:

1. Sound is produced by a __________ body.

Ans. Vibrating.

2. The human voice is produced by the __________.

Ans. Voice box or larynx.

3. Sound cannot travel through __________.

Ans. Vacuum.

4. The number of oscillations per second is called __________.

Ans. Frequency.

5. Sound is measured in __________.

 Ans. Decibels.

6. The range of audible sound for human beings is __________.

Ans. 20 Hz to 20,000 Hz.

7. The unit of frequency is __________.

Ans. Hertz (Hz).

8. The loudness of sound is measured in __________.

Ans. Decibel (dB).

9. The pitch of a sound depends on its __________.

Ans. Frequency.

10. Unwanted sound is called __________.

Ans. Noise.

C. True or False:

1. Plant cells do not have a nucleus.

Ans. False.

2. Sound cannot travel through a vacuum.

Ans. True.

3. Vibrating objects do not produce sound.

Ans. False.

4. Loudness of sound is proportional to the amplitude of vibration.

Ans. True.

5. The human ear can hear sounds beyond 30,000 Hz.

Ans. False.