The rupture of a balloon from a needle tip is an example of ………..
a) Force
b) newtons’3rd law
c) density
d) pressure
A block of concrete weighs 900N and its base is a square of side 3m. What pressure does the block exert on the ground?
a) 100N/m2
b) 100Pa
c) none of these
d) both a & b
Explanation: P=F/A F=W and A=3mx3m=9m2 So, P=900N/9m2 So P=100N/m2 or 100Pa
Pressure is a ………..quantity.
a) scalar
b) derived
c) basic
d) vector
For same force smaller surface exerts………..... pressure.
a) maximum
b) minimum
c) constant
d) none of these
Explanation: P=F/A , As pressure is inversely related to area so force with small surface the area is small therefore pressure will be maximum.
Atmospheric Pressure:
The earth is surrounded by a cover of air called
a) mesosphere
b) troposphere
c) atmosphere
d) lithosphere
