The pitch of sound depends on……….
a) frequency
b) Amplitude
c) Both of these
d)None of these
Eardrum is a part of……………
a) Sound producing organ
b) Sketal System
c) Hearing organ
d) Reproductive organ
Hearing takes place whenever vibrations of frequencies ranging from…..…Hertz reaches in the inner ear.
a) 10 to 10,000 Hertz
b) 20 to 20,000 Hertz
c) 30 to 30,000 Hertz
d) none of these
Sound waves need a medium such as a …….. to travel.
a) solid
b) liquid
c) gas
d) all of these
Sound travel most quickly through……..
a) solid
b) gases
c) air
d) liquids
When does our body use more energy?
a) when we speak gently
b) when we talk to our friend
c) when we cry over others
d) when we talk to our mother
