MCQ Questions for Class 8 Science Chapter 13 : NCERT CBSE RBSE other Board MCQ Questions for Class 8 Science Chapter 13 Sound with Answers Pdf free download. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern.
MCQ Questions for Class 8 Science Chapter 13 Sound with Answers
Q1. The voice box is also called as
(a) stomach
(b) heart
(c) larynx
(d) mouth
Answer: (c) larynx
Q2. Sound can travel through:
(a) gases only
(b) solids only
(c) liquids only
(d) solids, liquids and gases
Answer: (d) solids, liquids and gases
Q3. Sound is a kind of
(a) work
(b) energy
(c) force
(d) pressure
Q4. Voice of which of the following is likely to have minimum frequency:
(a) baby girl
(b) baby boy
(c) a man
(d) a woman
Answer: (a) baby girl
Q5. The hearing range of human ear is
(a) 20 Hz to 20,000 Hz
(b) less than 20 Hz
(c) more than 20,000 Hz
(d) 20 Hz to 25,000 Hz
Answer: (a) 20 Hz to 20,000 Hz
Q6. Vibration in a body produce:
(a) energy
(b) sound
(c) heat
(d) none of these
Answer: (b) sound
Q7. Pitch of sound is determined by its
(a) frequency
(b) speed
(c) amplitude
(d) loudness
Q8. A shehnai produces sound from:
(a) vibrating strings
(b) vibrating membrane
(c) vibrating air column
(d) none of these
Answer: (c) vibrating air column
Q9. The frequency of subsonic sound is
(a) more than 20 Hz
(b) 100 Hz
(c) less than 20 Hz
(d) more than 20,000 Hz
Answer: (c) less than 20 Hz
Q10. Drum produces sound from:
(a) vibrating membrane
(b) vibrating stretched membrane
(c) vibrating strings
(d) none of these
Answer: (b) vibrating stretched membrane
Q11. Cochlea is a part of
(a) hearing organ
(b) sound producing organ
(c) muscular organ
(d) air pollution
Answer: (a) hearing organ
Q12. Frequency of oscillations is:
(a) the number of oscillations per minute
(b) the number of oscillations per hour
(c) the number of oscillations per second
(d) none of these
Answer: (c) the number of oscillations per second
Q13. 1 hertz is equal to
(a) 1 vibration per minute
(b) 10 vibrations per minute
(c) 60 vibrations per minute
(d) 600 vibrations per minute
Answer: (c) 60 vibrations per minute
Q14. The unit of frequency is:
(a) hertz
(b) hertz /sec
(c) hertz / min
(d) hertz / hour
Answer: (a) hertz
Q15. Sound cannot travel through
(a) air
(b) water
(c) air
(d) vacuum
Q16. The frequency determines the of a sound.
(a) loudness
(b) pitch
(c) both loudness and pitch
(d) none of these
Answer: (b) pitch
Q17. The sound in the audible range is called
(a) ultrasonic sound
(b) sonic sound
(c) subonic sound
(d) light sound
Q18. When the amplitude is small, the sound produced is:
(a) loud
(b) feeble
(c) low pitched
(d) none of these
Answer: (b) feeble
Q19. A pendulum oscillates 20 times in 4 seconds. Find its time period.
(a) 0.05 sec.
(b) 0.001 sec.
(c) 0.2 sec.
(d) 0.1 sec
Q20. The ultrasound equipment works at frequencies:
(a) higher than 20,000 Hz
(b) lower than 20,000 Hz
(c) less than 20 Hz
(d) none of these
Answer: (a) higher than 20,000 Hz
Match the items given in column I suitably with those given in column II.
| Column I | Column II |
| 1. Audible frequencies | (a) 10 dB |
| 2. Length of vocal cords in man | (b) 30 dB |
| 3. Ultrasound | (c) 20 mm long |
| 4. Normal breathing | (d) 20 to 20,000 Hz |
| 5. Soft whisper (At 5 m) | (e) Hertz |
| 6. Frequency | (f) Percussion instrument |
| 7. Unpleasant sound | (g) Music |
| 8. Pitch | (h) Produced by bats |
| 9. Tabla | (i) Noise |
| 10. Pleasant sound | (j) Higher frequency |
Answer
Answer:
| Column I | Column II |
| 1. Audible frequencies | (d) 20 to 20,000 Hz |
| 2. Length of vocal cords in man | (c) 20 mm long |
| 3. Ultrasound | (h) Produced by bats |
| 4. Normal breathing | (a) 10 dB |
| 5. Soft whisper (At 5 m) | (b) 30 dB |
| 6. Frequency | (e) Hertz |
| 7. Unpleasant sound | (i) Noise |
| 8. Pitch | (j) Higher frequency |
| 9. Tabla | (f) Percussion instrument |
| 10. Pleasant sound | (g) Music |
