Class 8 Science MCQ Chapter 13 Sound Solutions in English Medium, Class 8 Science Multiple Choice Question Answer in English to each chapter is provided in the list so that you can easily browse throughout different chapters Class 8 Science MCQ Chapter 13 Sound Notes and select need one.
Class 8 Science MCQ Chapter 13 Sound
Also, you can read the SCERT book online in these sections Class 8 Science Objective Type Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. These solutions are part of SCERT All Subject Solutions. Here we have given Assam Class 8 Science MCQs Solutions in English for All Subject, You can practice these here.
Sound
Chapter – 13
| MCQ |
1. What happens to the frequency of sound as its pitch increases?
(a) It decreases.
(b) It stays the same.
(c) It increases.
(d) It becomes zero.
Ans: (c) It increases.
2. Which term describes the bending of sound waves around obstacles?
(a) Reflection.
(b) Diffraction.
(c) Absorption.
(d) Transmission.
Ans: (b) Diffraction.
3. In which medium does sound travel the slowest?
(a) Air.
(b) Water.
(c) Steel.
(d) Glass.
Ans: (a) Air.
4. What is the Doppler effect?
(a) Change in sound wave speed with frequency.
(b) Change in frequency due to relative motion.
(c) Change in amplitude due to medium.
(d) Change in wavelength due to temperature.
Ans: (b) Change in frequency due to relative motion.
5. When a sound source is moving away from an observer, the observed frequency:
(a) Increases.
(b) Decreases.
(c) Stays the same.
(d) Becomes zero.
Ans: (b) Decreases.
6. What does the term ‘ultrasonic’ refer to?
(a) Sounds below the human hearing range.
(b) Sounds within the human hearing range.
(c) Sounds above the human hearing range.
(d) Sounds at the human hearing threshold.
Ans: (c) Sounds above the human hearing range.
7. What is an echo?
(a) Sound absorption.
(b) Sound reflection.
(c) Sound diffraction.
(d) Sound refraction.
Ans: (b) Sound reflection.
8. Which instrument is used to measure sound intensity?
(a) Barometer.
(b) Thermometer.
(c) Sound level metre.
(d) Seismograph.
Ans: (c) Sound level metre.
9. The phenomenon where sound waves are absorbed and weakened as they travel through a medium is called:
(a) Reflection.
(b) Diffraction.
(c) Absorption.
(d) Transmission.
Ans: (c) Absorption.
10. What is the wavelength of a sound wave if its frequency is 440 Hz and its speed is 340 m/s?
(a) 0.77 m.
(b) 0.68 m.
(c) 0.8 m.
(d) 0.6 m.
Ans: (a) 0.77 m.
11. Which of the following will not affect the speed of sound?
(a) Temperature.
(b) Pressure.
(c) Humidity.
(d) Frequency.
Ans: (d) Frequency.
12. The property of sound that refers to its highness or lowness is known as:
(a) Loudness.
(b) Timbre.
(c) Pitch.
(d) Intensity.
Ans: (c) Pitch.
13. What is the phenomenon where sound waves pass through a medium without being absorbed or reflected?
(a) Reflection.
(b) Refraction.
(c) Transmission.
(d) Diffraction.
Ans: (c) Transmission.
14. Which of the following factors does NOT affect the pitch of a sound?
(a) Frequency.
(b) Amplitude.
(c) Speed.
(d) Wavelength.
Ans: (b) Amplitude.
15. The speed of sound is faster in:
(a) Hot air.
(b) Cold air.
(c) Vacuum.
(d) Ice.
Ans: (a) Hot air.
16. What term is used for sounds below 20 Hz?
(a) Ultrasonic.
(b) Audible.
(c) Infrasonic.
(d) Supersonic.
Ans: (c) Infrasonic.
17. What is the primary factor determining the loudness of a sound?
(a) Frequency.
(b) Wavelength.
(c) Amplitude.
(d) Speed.
Ans: (c) Amplitude.
18. In which situation would sound travel fastest?
(a) Through air at 0°C.
(b) Through water at 25°C.
(c) Through steel at 20°C.
(d) Through air at 25°C.
Ans: (c) Through steel at 20°C.
19. A sound wave’s frequency determines its:
(a) Speed.
(b) Volume.
(c) Pitch.
(d) Wavelength.
Ans: (c) Pitch.
20. What happens to the sound when the frequency of the source increases?
(a) Pitch decreases.
(b) Pitch increases.
(c) Loudness decreases.
(d) Loudness increases.
Ans: (b) Pitch increases.
