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
The speed of sound in steel is……….
a) 350 m/s
b) 2,100 m/s
c) 1,500 m/s
d) 6,000 m/s
Sound travels the slowest in…….
a) water
b) steel
c) copper
d) air
Which group of people is unable to hear one another?
a) a group of mountaineers on k-2
b) a group of tourists in deserts
c) a group of astronauts on the Moon
d) a group of people in a closed room
A sound is produced by ………..
a) vibrating body
b) non-vibrating body
c) solid body
d) liquid body
Sound is a form of………
a) voice
b) light
c) energy
d) all of these
