CBSE Class 8 - Science - Ch 13 - Sound (MCQs)

Sound

MCQs

Q1: In dholak sound is produced due to ...

(a) stretched membrane
(b) stretched strings
(c) air column
(d) vibration of air


Q2:The pitch of sound depends on the __________ of the vibrating body.

(a) amplitude
(b) noise
(c) frequency
(d) medium of propagation


Q3: Speed of sound in solids is ______ the speed of sound in liquids.

(a) same as
(b) greater than
(c) less than
(d) sometimes greater and sometimes less than


Q4: The human ear can hear sounds having frequency in range ...

(a) between 200 - 20,000 Hz
(b) between 20 - 2000 Hz
(c) between 200 - 2000 Hz
(d) between 20 - 20,000 Hz


Q5: The time taken to complete ___ oscillation(s) is called time period.


(a) one
(b) ten
(c) two
(d) hundred


Q6: To and fro or back and forth motion of an object is termed as _____.

(a) frequency
(b) amplitude
(c) vibration
(d) time period


Q7: Vocal cords in men are about ___ long.

(a) 20 mm
(b) 20 cm
(c) 2 mm
(d) 2 cm


Q8: Length of vocal cords of women is _____ men.

(a) greater than
(b) less than
(c) same as
(d) slightly greater than


Q9: Sound cannot travel in _____.

(a) solids
(b) liquids
(c) gases
(d) vacuum


Q10: The sound above ___ is physically painful.

(a) 20 dB
(b) 40 dB
(c) 60 dB
(d) 80 dB


Answers:
1: (a) stretched membrane
2: (c) frequency
3: (b) greater than
4: (d) between 20 - 20,000 Hz
5: (a) one
6: (c) vibration
7: (a) 20 mm
8: (b) less than
9: (d) vacuum
10:(d) 80 dB