EXERCISE PRESSURE
GRADE : 8
1. Some objects
except ….
a. Knife
b. Nail
below
applying
pressure,
c. Spoon
d. Crowbar
2. This is SI Unit of pressure, except …..
a. Pascal
b.
kg.m / s 2
m2
c.
N
m2
d. atmosphere
3. The formula of average pressure is….
a. p = F . A
b. F =
p
A
F
A
A
d. p =
F
c. p =
4. A force acts on area. The pressure which is
exerted by the force increases when….
a. The force and the area are increased
b. The force is decreased and the area is
increased
c. The force and the area are decreased
d. The force is increased and the area is
decreased
5. The magnitude of hydrostatic pressure is
influenced by the….
a. Depth and density of liquid
b. Depth and volume of liquid
c. Volume and area of the container of
liquid
d. Depth and area of the container of the
liquid
6. An example of an application of Pascal’s
principle is ….
a. A water pump
b. A submarine
c. A manometer
d. A hydraulic machine
7. When will the object flying in some water?
a. The weight of the object is less than the
weight of water displaced
b. The weight of the object is greater than
the weight of water displaced
c. The weight of the object is equal to the
weight of water displaced
d. The weight of the object is same as to the
weight of water displaced
8. When a cube is totally immersed, if the weight
of the water which is ....... is greater than the
weight of the cube.
a. Floating
c. sinking
b. flying
d. greeting
9. A dam holding back the water in a reservoir
exerts a horizontal force on the water. The
magnitude of this force depend on
a. The maximum depth of the reservoir
b. The surface area of the reservoir
c. The depth of the water at the location of
the dam
d. Both (a) and (c)
10. A body will float if it displaces a weight of
water …… its own
a. Less than
c. equal to
b. Greater than d. the same as
.
11. Archimedes’ principle tells us about the ……
of water by solid bodies
a. equilibrium
c. immersion
b. displacement d. temperature
12. Look at the Table
Liquid
Density (kg/m3)
Gasoline
680
Alcohol
790
Palm oil
800 – 900
seawater
1025
Which the fluid that has most pressure the
same depth?
a. Alcohol
c. Palm oil
b. Gasoline
d. seawater
13. The picture of the spurt of some water if the
same hole is ….
a
c.
b.
d.
14. The best of the egg will sinking if it fill in some
water, so that it floating must tried
1
….
a. Make the egg is salty
b. The egg stewed than fill in some water
c. To fill some salt into some water and
mixed
d. To fill some palm oil into some water.
16.
Some one step on your toe, exerting a force of
1000 N on an area of 20 cm2. What is the
average pressure on that area.
a. 500.000 Pa
c. 500 Pa
b. 50.000 Pa
d. 50 Pa
17.
A block of wood floats in oil with 80% of its
volume submerged. If the density block of
wood is 0,6 g/cm3. What is the density of oil?
a. 0,80 g/cm3
c. 0,60 g/cm3
3
b. 0,75 g/cm
d. 0,48 g/cm3
18.
The large box of wood (size 3m x 4m x 2m)
weight 60.000 Newton. What is the area to
make maximum pressure if the box stays on
the floor?
e. 4 m2
c. 8 m2
2
f. 6 m
d. 12 m2
19.
Look at the picture!
15. The Hartl machine can determine the liquid
pressure which it depend on ….
a. the depth and the density of liquid
b. the density of liquid and the area of the
tube
c. the depth and the area of the tube
d. The gravitation and area of the tube.
Weight of car 5.000 N, if the crosssectional area of the small piston 30 cm2
and the large piston is 600 cm2. What is
the force exerted on the small piston:…
a. 50 N
c. 25.000 N
b. 250 N
d. 1.000.000 N
20.
12. A 90 Newton force is exerted on the small
piston a hydraulic system. The crosssectional area of small piston is 0,05 m2.
What is the magnitude of the weight that
can be lifted by the large piston, which has
a surface area of 1,5 m2?
g. 3 N
c. 270 N
h. 30 N
d.2.700 N
2
21.
Look at the picture!
WA
TER
X=?
2 cm
Mercury
If the density of mercury is 13.600 kg/m3
and the density of water is 1.000 kg/m3
Length of water column is ….
a. 6,8 cm
c. 13,6 cm
b. 10 cm
d. 27,2 cm
22.
The container fills 6.000 liter kerosene. The
density of kerosene is 0,80 gram/cm3. If the
height of container 1,2 m, the pressure in the
foundation of container is ….. (g = 9,8 m/s2)
a. 4.704 Pa
c. 7.056 Pa
b. 5.760 Pa
d. 9.408 Pa
23.
The tube fill some water (air = 1 g/cm3) and
some ice is floating. The volume of the ice
immersed = 45 cm3 (es = 0,9 g/cm3), The total
volume of a ice is .…
a. 5 cm3
c. 50 cm3
b. 40,5 cm3
d. 450 cm3
24.
The volume of the object is 2,5 m3 immersed
into the watersea.The density of watersea
1.200 kg/m3. If the gravitation is 10 ms-2, the
upthrust of the watersea on it is ….
a. 48.0000 N
b. 4.800 N
c. 30.000 N
d. 3.000 N
25.
In air the object weighed with spring balance
is 25 N. If it weighed in some water is 19 N.
The upthrust of some water to the object is …
a. 44 N
c. 19 N
b. 25 N
d. 6 N
26.
Look at the picture!
3
X
10 cm
7 cm
Water
If the density of water 1000 kg/m3.
Calculate the density of liquid X !
27.
How do you make a sheet of aluminum foil
float in some water? And how do you change
its shape so it can sink?
28.
The pipe U is fill some fluid like picture below.
Weight A is 200 N and weight B is 500 N. If
the area of piston A = 5 cm3
Calculate the area of piston B.
29.
A stone is weighing the weight in air; when
half part of stone immersed in some water
and total part of stone immersed are not
series. The data are 6 N, 10N and 8 N.
a. What weight it in air?
b. What weight it immersed a half of part?
c. What the upthrusth of the stone immersed
half part and total part ?
30.
The volume of wood block 500 cm3 immersed
in some water with density is 1000 kg/m3. If
the density of wood 600 kg/m3 and the
gravitation is 10 N/kg. calculate:
c. Volume of wood block is immersed
d. the upthrust in the wood block
e. the weight of wood block in the air
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