Sound Quiz

1.Sound travels in air if

• particles of medium travel from one place to another

• there is no moisture in the atmosphere

• disturbance moves

• both particles as well as disturbance travel from one place to another

2.When we change feeble sound to loud sound we increase its

• frequency

• amplitude

• velocity

• wavelength

3.When the vibrating object moves backwards, it creates a region of low pressure called ________ .

• Refraction

• Reflection

• Rarefaction

• Retardation

4.The distance which compression or a rarefaction travels per unit of time gives ________ .

• The density of sound wave

• Speed of sound

• Wavelength of sound

• Frequency of sound

5.Sound travels through which medium?

• Solid

• Liquid

• Gas

• All the above

6.An object is Vibrating at 4000 Hz. The time period of sound produced is

• 0.0025 sec

• 0.025sec

• 0.00025sec

• 0.0005 sec

7.The wave velocity, frequency & wavelength are related as

• v = λ

• λ = v

•  = λ/v

• v = λ/

8.Which statement is incorrect about sound wave.

• Sound waves Obey law of reflection

• These are mechanical waves

• They cannot travel in vacuum

• Sound waves do not require medium for propagation

9.The Pitch of sound increases if its frequency

• increase

• one-fourth

• decrease

• one

10.The speed of sound is maximum in

• copper

• air

• water

• vacuum