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Fluid Mechanics- Density, Pressure, Buoyancy, Lift

Total questions: 46

Worksheet time: 12hrs 30mins

Name
Class
Date
1.
Displacement means
a)
to take place
b)
to replace
c)
to fill up space 
d)
to move aside
2.
This is the relationship between area and pressure 
a)
As area increases, the pressure increases
b)
As area increases, the pressure decreases.
c)
As area decreases, the pressure decreases
d)
They have no effect on each other
3.
How does the diameter of a column (depth) of water affect the pressure at the bottom of the column?
a)
No effect
b)
The pressure decreases
c)
The pressure increases
d)
It depend upon the length of the diameter.
4.
If an object displaces less water than its weight, the object will
a)
float
b)
accelerate
c)
create friction
d)
sink
5.
If an object displaces more water than its weight, the object will
a)
float
b)
accelerate
c)
create friction
d)
sink
6.
The weight of the water displaced equals the upward force of water on an object
a)
Pressure
b)
Inertia
c)
Archimedes' Principle
d)
The Law of Water
7.
Pressure =
a)
force/volume
b)
volume/area
c)
mass/volume
d)
force/area
8.

The buoyant force on an object equals 50 N. What is the weight of the displaced water?

a)

50 N

b)

50 lbs

c)

50 N/9.8 m/sec2

d)

not enough information given

9.
An object weighs 500 N.  It displaces 150 N of water.  While in water, the object's weight is
a)
500 N
b)
650 N
c)
.33 N
d)
350 N
10.
Why does a steel ship float, while a block of the same steel sinks?
a)
shape of object
b)
air is lighter than water
c)
the block's buoyancy is less than its weight
d)
all of the above
11.
Buoyancy force equals
a)
weight of displaced water
b)
the "weight loss" of the object immersed in water
c)
upward force of water 
d)
all of these 
12.
What causes the apparent "weight loss" of an object immersed in water?
a)
Gravity
b)
Buoyancy
c)
Newton's 1st law
d)
Newton's 2nd law
13.
What does eureka mean in English?
a)
I like baths!
b)
I've lost it!
c)
I've found it!
d)
I've had enough!
14.
Looking at the image... can oak float in water? 
a)
Yes
b)
No
15.
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. 
16.
What is a hydrometer? 
a)
an instrument that measures pressure
b)
an instrument that measures buoyancy
c)
an instrument for ocean studies
d)
an instrument designed to measure liquid density
17.
How could you make plastic sink and steel float?
a)
You can't 
b)
Change the shape and therefore surface area 
c)
Remove some mass 
18.

Ideal fluid has

a)

Static condition

b)

Zero viscosity

c)

constant viscosity

d)

incompressible nature

19.

Calculation of water pressure force on dam is the problem of

a)

Statics

b)

Kinetics

c)

Kinematics

d)

Dynamics

20.

Pitot tube measures

a)

atmispheric pressure

b)

Pressure in a car tyre

c)

velocity of flow

d)

piezometric pressure

21.

For laminar flow in a pipe Reynold's number should be

a)

less than 500

b)

more than 4000

c)

less than 2000

d)

1

22.

The unit of kinematic viscosity is

a)

Pa.s

b)

Sq.m per sec

c)

Pa.sec / sq. m

d)

Kg.sec sq. / sq. m

23.

Poise is the unit of

a)

Mass density

b)

Kinematic viscosity

c)

viscosity

d)

velocity gradient

24.

A Newtonion fluid is defined as the fluid which

a)

is incompatible and non-viscous

b)

Obeys Newton's law of viscosity

c)

is higly viscous

d)

is compressible and viscous

25.

Which of the following represent the major energy loss

a)

Bend in pipe

b)

Pipe fittings

c)

Sudden exoansion

d)

Friction loss

26.
Pressure at the bottom of the ocean is greatest because:
a)
The water is most dense at the bottom.
b)
The water is least dense at the bottom.
c)
The water is buoyant at the bottom.
27.

Using the particle model of matter, viscosity is described as

a)

the larger the molecules, the higher the viscosity

b)

the greater the distance between the particles, the greater the viscosity

c)

the greater the friction between particles, the greater the viscosity

d)

the faster the particles are moving, the greater the viscosity

28.

You are designing an experiment to measure the viscosity of a substance. You think that if you take a marble with a known mass and drop it in various substances; you will get one of the following results:

a)

The marble will drop fastest in the most viscous liquid.

b)

The marble will drop the fastest in the least viscous liquid.

c)

The marble will not fall in any of the liquids.

d)

The marble will drop at the same speed in all liquids.

29.

What is the density of 20 mL of lead that has a mass of 200 g?

a)

10

b)

20

c)

20,4

d)

15.6

30.

If Line C represents the density of distilled water, then Line D could represent the density of

a)

cement block

b)

wood

c)

gold

d)

titanium

31.

What is the density represented by line A

a)

20g/mL

b)

5g/mL

c)

5mL/g

d)

100g/mL

32.

Which of the following is in the order from most dense to least dense?

a)

winter salt water, summer salt water, tropical fresh water

b)

summer salt water, winter salt water, tropical fresh water

c)

tropical fresh water, summer salt water, winter salt water

d)

tropical fresh water, winter salt water, summer salt water

33.

Consider a hot air balloon. Which statement is correct?

a)

when the buoyant force equals the force of gravity, the balloon stops rising

b)

when the balloon is heated, the air particles in the balloon move more slowly

c)

the balloon rises because the buoyant force is less than the force of gravity

d)

as the balloon is heated, it becomes more dense than the surrounding air

34.

The Plimsoll line on a ship is a line

a)

which measures the mass of the loads on the ship

b)

which indicates the safe mass that can be loaded in the front of the ship

c)

which indicates the safe depth to which the ship can be loaded in different water conditions

d)

which measures the depth to which the ship can be loaded

35.

According to the Particle Model of Matter, air is a more compressible fluid than a liquid, because

a)

liquid particles are moving at lesser speeds

b)

liquids have more particles per volume

c)

air particles are moving at greater speeds

d)

air has more particles per volume

36.

An average man is 850 N and the area of the shoes he is standing on is 0.0098 m2. What is the approximate pressure he is exerting on the ground?

a)

87,000 N/m2

b)

8,700 N/m2

c)

870 N/m2

d)

87 N/m2

37.
In what direction(s) does air exert pressure?
a)
everywhere
b)
no where
c)
there is no pressure
d)
downward
38.
What is altitude?
a)
how much something weighs
b)
the distance above sea level
c)
how big something is
d)
how far away something is
39.
As you climb up a mountain what happens to the air pressure?
a)
decreases
b)
increases
c)
stays the same
40.
Cold air exerts _____________ pressure than warm air.
a)
the same
b)
more
c)
less
41.
Density of air is greater at high altitudes.
a)
true
b)
false
42.
Altitude is greater __________.
a)
at the bottom of the mountain
b)
at the top of the mountain
c)
at the center of the mountain
43.
The amount of mass in a unit volume of a substance
a)
mass
b)
pressure
c)
volume
d)
density
44.
Why is it hard to breath at high altitudes?
a)
There is too much oxygen in this location.
b)
There is a higher density of air molecules.
c)
There is a low density of air molecules.
d)
The air pressure is greater than at low altitudes.
45.
If density of air is high, pressure is:
a)
high
b)
low
46.
More molecules close together, means density is:
a)
high
b)
low

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