Exercise class 8 science chapter 3 force and pressure । Exercise force and pressure । Std 8 science

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1. Write proper word in the blank space.
a. The SI unit of force is ...............
(Dyne, Newton, Joule)
b. The air pressure on our body is equal
to........... pressure.
(Atmospheric, Sea bottom, Space)
c. For a given object, the buoyant force
in liquids of different.... is............... .
(the same, density, different, area)
d. The SI unit of pressure is ...............
(N/m3
, N/m2
, kg/m2
, Pa/m2)
2. Make a match.
A group
B group
1. Fluid
a.Higher pressure
2. Blunt knife
b. Atmospheric
Pressure
3. Sharp needle
c. Specific gravity
4. Relative density
d. Lower pressure
5. Hecto Pascal
e. Same pressure
in all directions
3. Answer the following questions in brief.
a. A plastic cube is released in water. Will
it sink or come to the surface of water?
b. Why do the load carrying heavy
vehicles have large number of wheels?
c. How much pressure do we carry on
our heads? Why don’t we feel it?
4. Why does it happen?
a. A ship dips to a larger depth in fresh
water as compared to marine water.
b. Fruits can easily be cut with a sharp
knife.
c. The wall of a dam is broad at its base.
d. If a stationary bus suddenly speeds
up, passengers are thrown in the
backward direction.
5. Complete the following tables.
Mass (kg) Volume (m3)
Density (kg/m3)
350
175
-
-
190
4
Density of
Metal (kg/m3)
Density of
water (kg/m3)
Relative
Density
103
5
8.5 x 103
103
-
Weight (N)
Area
(m2)
Pressure (Nm-2)
-
0.04
20,000
1500
500
-
6. The density of a metal is 10.8 x 103
kg/
m3
. Find the relative density of the
metal.
(Ans. 10.8)
7. Volume of an object is 20 cm3
and the
mass in 50 g. Density of water is 1 gcm-3.
Will the object float on water or sink in
water?
(Ans : Sink)
8. The volume of a plastic covered sealed
box is 350 cm3
and the box has a mass
500 g. Will the box float on water or
sink in water? What will be the mass of
water displaced by the box?
(Ans : Sink, 350 g)