The standard atmosphere is a unit of atmospheric pressure and is equivalent to…Pa.
a) 760
b) 101325
c) 101.325
d) 1
Which of the following expands the balloon when you blow air in it?
a) force
b) pressure
c) volume
d) area
After inflating a balloon, why do we have to close its mouth?
a) extra air come into the balloon
b) air comes out due to lower pressure inside
c) air comes out due to higher pressure inside
d) none of these
The air pressure inside the balloon is…..in all directions.
a)same
b) less in mouth
c)greater at bottom
d)different
Buoyancy:
Buoyancy, or upthrust, is an upward force
exerted by a fluid that opposes the weight of a partially or fully immersed
object. In a column of fluid, pressure increases with depth as a result of the
weight of the overlying fluid.
Why
a cork pushes back in water when you try to push it underwater?
a)the density of cork is greater
b) the density of cork is equal to water
c) the water exerts an upward force
d) all of these
