MCQ Questions for Class 8 Science: Ch 13 Sound

MCQ Questions for Class 8 Science: Ch 13 Sound

1. Sound is a kind of
(a) work
(b) energy
(c) force
(d) pressure
► (b) energy

2. 1 hertz is equal to
(a) 1 vibration per minute
(b) 10 vibrations per minute
(c) 600 vibrations per minute
(d) 60 vibrations per minute
► (d) 60 vibrations per minute

3. In which medium sound travels faster?
(a) Metals
(b) Water
(c) Same in all medium
(d) Air
► (a) Metals

4. Pitch of sound depends upon
(a) Frequency
(b) Wavelength
(c) Time-period
(d) Amplitude
► (a) Frequency

5. When we say that sound travels in a medium, what do we mean?
(a) The particles of the medium travel.
(b) The source travels.
(c) The disturbance travels.
(d) The medium travels.
► (c) The disturbance travels.

6. Eardrum is a part of:
(a) Sound producing organ
(b) Skeletal system
(c) Hearing organ
(d) Reproductive organ
► (c) Hearing organ

7. One of the most common well-known periodic motion is that of
(a) Quartz clock
(b) Sundial
(c) Simple pendulum
(d) Digital clock
► (c) Simple pendulum

8.Sound propagates maximum in
(a) gas
(b) liquid
(c) solid
(d) all
► (c) solid

9. What is the length of vocal cords in men?
(a) 15mm
(b) 20mm
(c) 5mm
(d) 10mm
► (b) 20mm

10. The voice box is also called:
(a) Stomach
(b) Heart
(c) Larynx
(d) Mouth
► (c) Larynx

11. Noise pollution is harmful for
(a) human
(b) cat
(c) bird
(d) all
► (d) all

12. Large amplitude of sound vibrations will produce:
(a) Loud sound
(b) Meak sound
(c) Slow sound
(d) Shreak
► (a) Loud sound

13. The minimum distance from sound reflecting surface to hear an echo is about
(a) 17.2 m
(b) 35 m
(c) 27.2 m
(d) 20 m
► (a) 17.2 m

14. Sound lost more energy in
(a) air
(b) vacuum
(c) liquid
(d) solid
► (a) air

15. An object oscillates 50 times in one second. What is its frequency?
(a) 0.2 Hz
(b) 0.02 Hz
(c) 0.002 Hz
(d) 50 Hz
► (d) 50 Hz

16. Sound of single frequency is called a
(a) Noise
(b) Tone
(c) Note
(d) Music
► (b) Tone

17. Ultrasound is used in
(a) X-rays
(b) Echocardiography
(c) Speedometer
(d) Micrometer
► (b) Echocardiography

18. In human beings, which of the following produces the sound?
(a) Larynx
(b) Wind pipe
(c) Eardrum
(d) Lungs
► (a) Larynx

19. When a tightly stretched band is plucked it
(a) Only oscillate to and fro
(b) Produce sound but do not vibrate
(c) Vibrate but do not produce sound
(d) Vibrate and produce sound
► (d) Vibrate and produce sound

20. On what factors does the pitch of sound depend?
(a) Frequency
(b) Amplitude
(c) Loudness
(d) The distance from source
► (a) Frequency

21. The SI unit of frequency is
(a) Lambda
(b) Hertz
(c) Meter
(d) Decibel
► (b) Hertz

22. Ultrasound equipment for investigating and tracking medical problems, works at frequency
(a) At any frequency
(b) At 20000 Hz only
(c) Higher than 20000 Hz
(d) Lower than 20000 Hz
► (c) Higher than 20000 Hz

23. In most of the cases vibration of objects are not visible because
(a) Wavelength is very large
(b) Wavelength is very small
(c) Amplitude is very small
(d) Frequency is very less
► (c) Amplitude is very small

24. What is the number of vibrations made by a body in one second called?
(a) Frequency
(b) Wavelength
(c) Loudness
(d) Pitch
► (a) Frequency

25. Loudness of sound depends upon its
(a) Wavelength
(b) Amplitude
(c) Frequency
(d) Time-period
► (b) Amplitude
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