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WorksheetsPhysics, Fluid Mechanics, Post Assessment
Total questions: 25
Worksheet time: 15mins
Name
Class
Date
1.
The unit m3 is a unit of:
a)
Volume
b)
Mass
c)
Density
d)
Area
2.
The density of water is ____ g/cm3.
a)
1
b)
1000
c)
100
d)
10
3.
Cutting a watermelon in half causes the density of the watermelon to:
a)
Increase
b)
Decrease
c)
Remain constant
4.
A g or kg is a unit of:
a)
Mass
b)
Volume
c)
Density
d)
Area
5.
Standing on one foot causes the pressure on the floor to:
a)
Increase
b)
Decrease
c)
Remain constant
6.
It is "safe" to lay on a bed of nails due to:
a)
The increased area the nails create
b)
The increased pressure the nails create
c)
The smaller area the nails create
d)
The less force that acts on your body
7.
When dealing with pressure, area, and force have what type of relationship?
a)
Direct
b)
Inverse
c)
No relationship
8.
Find the volume of this piece of brass.
a)
50 g
b)
10 cm
c)
6 cm3
d)
12 cm3
9.
A fluid exerts 500 N of force over an area that measures .5 m2. What is the pressure exerted by the fluid?
a)
1,000 Pa
b)
2,000 Pa
c)
750 Pa
d)
250 Pa
10.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
11.
A 2 m long steel cube rests on the floor. The pressure the cube exerts on the floor is 2000 Pa. Find the force of the cube.
a)
0.001 N
b)
1000 N
c)
4000 N
d)
8000 N
12.
What system used in many applications like forklifts or jacks works on Pascal's principle
a)
hydraulics
b)
sprockets
c)
widgets
d)
brakes
13.
The English unit for pressure.
a)
psi (pounds per square inch)
b)
mph
c)
lbs
d)
$$$
14.
Which direction does buoyant force always push?
a)
downward
b)
upward
c)
all directions
d)
sponge bob
15.
Which of the following is NOT an example of laminar flow?
a)
a river moving slowly in a straight line
b)
smoke rising upward in a smooth column through air
c)
water flowing evenly from a slight opened faucet
d)
smoke twisting as it moves upward from a fire
16.
Which of the following properties is NOT a characteristic of an ideal fluid?
a)
laminar flow
b)
turbulent flow
c)
nonviscous
d)
incompressable
17.
Which of the following statements is NOT correct?
a)
A fluid flows
b)
a fluid has a definite shape
c)
molecules of a fluid are free to move past each other
d)
a fluid changes it shape easily
18.
How does a liquid differ from a gas?
a)
a liquid has both definite shape and definite volume, whereas a gas has neither
b)
a liquid has a definite volume, unlike a gas
c)
a liquid has a definite volume unlike a gas
d)
a liquid has a definite shape whereas a gas has a definite volume
19.
Which of the following is a fluid?
a)
helium
b)
ice
c)
iron
d)
gold
20.
Which of the following is NOT a fluid?
a)
carbon dioxide
b)
hydrogen
c)
seawater
d)
wood
21.
For incompressible fluids, density changes little with changes in what?
a)
depth
b)
temperature
c)
pressure
d)
free-fall acceleration
22.
Density is defined as...
a)
Centimeters cubed per mass of substance
b)
Mass per unit volume of a substance
c)
Flow rate of a substance
23.
If the mass of an object is 6kg on earth. what would the mass be on the moon?
a)
6kg
b)
0kg
c)
1kg
d)
13kg
24.
Buoyancy is the tendency for objects to float in a fluid. We consider buoyancy the...
a)
Un-gravity force
b)
Anti-gravity force
c)
Gravitational pull
d)
Downwards pull on an object
25.
Archimedes' Principle states that...
a)
The buoyant force acting on an object equals the volume of the fluid displaced by the object.
b)
The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.
c)
The buoyant force acting on an object will always be equal.
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