NCERT Solutions For Class 8 Science Chapter 10 Sound MCQs

NCERT Solutions For Class 8 Science Chapter 10 Sound Multiple Choice Questions

Question 1. The ultrasound waves can penetrate matter to a large extent because they have

1. Very High Frequency
2. Very High Speed
3. Very High Quality
4. Very High Amplitude

Answer: 1. Very High Frequency

Question 2. A person works in a factory where a lot of industrial machines run daily. What harmful effects is he likely to suffer from?

1. Fever
2. Cataract
3. Lack of vision
4. Lack of hearing

Answer: 4. Lack of hearing

NCERT Class 8 Science Chapter 10 Sound MCQs

Question 3. Loudness of sound is measured in units of

1. Decibel (db)
2. Hertz (Hz)
3. Metre (m)
4. Metre/second(m/s)

Answer: 1. Decibel (db)

Question 4. The loudness of sound is determined by its

1. Amplitude of vibration
2. Ratio of amplitude and frequency of vibration
3. Frequency of vibration
4. Product of amplitude and frequency of vibration

Answer: 1. Amplitude of vibration

Question 5. Pitch of sound is determined by its NCERT

1. Frequency
2. Speed
3. Amplitude
4. Loudness

Answer: 1. Frequency

NCERT Solutions for Sound Chapter 10

Question 6. The maximum displacement of a vibrating body from its mean position Is called

1. Frequency
2. Period
3. Amplitude
4. None Of These

Answer: 3. Amplitude

Question 7. Ultrasound has a frequency of vibration

1. Between 20 and 20000 Hz
2. Below 20 Hz
3. Above 20000 Hz
4. Between 500 and 10000 Hz

Answer: 3. Above 20000 Hz

Question 8. Which of the following sounds can be classified as noise for humans?

1. Sounds that are softer than 20 dB
2. Sounds that are in between 20 dB and 40 dB
3. Sounds that are between 40 dB and 80 dB
4. Sounds that are louder than 80 dB

Answer: 4. Sounds that are louder than 80 dB

Class 8 Chapter 10 Sound Multiple Choice Questions

Question 9. Which of the following are used to study the growth of the foetus inside the mother’s womb?

1. Radiowaves
2. X-rays
3. Infrared waves
4. Sound waves

Answer: 4. Sound waves

Question 10. Sound can be produced by

1. Applying an object
2. Vibration on objects
3. Passing electric current through an object.
4. Effect of a magnet on an object

Answer: 2. Vibration ot objects

Question 11. Loudness of sound depends upon its

1. Frequency
2. Pitch
3. Amplitude
4. Shirillness

Answer: 3. Amplitude

NCERT Solutions for MCQs on Sound Chapter 10

Question 12. The human brain can sense sound frequencies

1. Less Than 20 Hz
2. Between 20 Hz And 20000 Hz
3. More Than 20000 Hz
4. All Of The Above

Answer: 2. Between 20 Hz And 20000 Hz