DELHI PUBLIC SCHOOL – BOPAL, AHMEDABAD
STD IX
CH – SOUND
PLP WORKSHEET - 1
MULTIPLE CHOICE QUESTIONS
1. While designing an auditorium, an engineer uses which of the following points?
i. Makes concave back stage:
ii. Uses sound absorbing materials.
iii. Reduces reverberation time.
iv. Increases echo.
a. i and iii only.
b. i, ii, iii and iv.
c. i, ii and iii only.
d. Only i and ii.
2. Which of the following statement best describes frequency ?
a. the maximum disturbance caused by a wave
b. the number of complete vibrations per second
c. the distance between one crest of a wave and the next one
d. the distance travelled by a wave per second
3. Which one of the following does not consist of transverse waves ?
a. light emitted by a CFL
b. TV signals from a satellite
c. ripples on the surface of a pond
d. musical notes of an orchestra
4. The speed of highly penetrating ultrasonic waves is :
a. lower than those of audible sound waves
b. higher than those of audible sound waves
c. much higher than those of audible sound waves
d. same as those of audible sound waves.
5. Assertion : The speed of sound in solids is maximum though their density is large.
Reason : Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids.
a. Both assertion and reason are true and reason is the correct explanation of assertion.
b. Both assertion and reason are true but reason is not the correct explanation of assertion.
c. Assertion is true but reason is false.
d. Assertion is false but reason is true.
