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Mekanika Fluida

Total questions: 40

Worksheet time: 15mins

Name
Class
Date
1.
What are the states of matter?
a)
solid, liquid, and juice
b)
solid and liquid
c)
solid and gas
d)
solid, liquid, and gas
2.
Which box has a higher density?  
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
3.
If an object sinks in a fluid, _____.
a)
the density of the fluid is greater than the density of the object
b)
the density of the fluid is less than the density of the object
c)
the density of the fluid is equal to the density of the object
d)
density has nothing to do with whether an object sinks or floats, only which state of matter the object is
4.
Water pressure increases as depth increases. 
a)
True
b)
False
5.

The term fluids generally applies to:

a)

solid and liquid

b)

liquid and gas

c)

solid and plasma

d)

water only

6.

Which statements below is INCORRECT about liquids and gases?

a)

Liquids possess greater kinetic energy than gases.

b)

Gases have weak molecular force of attraction while liquids have a moderate force of attraction.

c)

Liquids have a definite size where gases can expand to fill any closed container.

d)

Gases are easily compressed where liquids are not.

7.

These statements are about the particle model of matter. Which one is not correct?

a)

Liquids are hard to compress because their particles are very close together

b)

Gases expand to fill their container because there are only weak forces between the particles

c)

Liquids can flow because there are only very weak forces between the particles

d)

Solids have a fixed shape because there are very strong forces between the particles

8.

Why do solids expand when they are heated?

a)

The particles get bigger

b)

The particles vibrate more and take up more space

c)

The particles vibrate more and get closer together

d)

The particles stick together

9.

Density is

a)

the weight of a fixed mass of something

b)

the volume of a fixed weight of something

c)

the weight of a fixed volume of something

d)

the mass of a fixed volume of something

10.
What is the secret of how a ship floats?
a)
its size 
b)
its hollow shape 
c)
the amount of cargo it carries
d)
number of passengers on board
11.
How do you find the volume of an irregular shaped solid?
a)
water displacement
b)
weighing it
c)
using a balance
d)
multiplying the length by its sides
12.
How does air pressure change as you go from the top of a mountain to sea level?
a)
pressure increases
b)
pressure decreases
c)
pressure stays the same
d)
it depends of the weather
13.

Density is:

a)

the weight of a fixed mass of something.

b)

the volume of a fixed weight of something.

c)

the weight of a fixed volume of something.

d)

the mass of a fixed volume of something.

14.

When liquid water changes into steam it is:

a)

evaporating.

b)

condensing.

c)

melting.

d)

dissolving.

15.

In what way is ice different to other solid materials?

a)

It is colder.

b)

It occurs naturally.

c)

Ice (solid water) is less dense than liquid water.

d)

The density of ice does not change when it is cooled down.

16.

Which of these forces is the upthrust?

a)

A

b)

B

c)

C

d)

D

17.

Why does a hot air balloon float in air?

a)

Air is less dense than water.

b)

The density of hot air is less than the density of cold air.

c)

Air is denser on cold days.

d)

The overall density of the balloon and its basket is less than the density of the air.

18.

The air resistance of a car can be reduced by:

a)

making the car bigger.

b)

giving it a streamlined shape.

c)

making the car heavier.

d)

putting a roof box on it.

19.

A car needs a forwards force to keep moving because:

a)

everything needs a force to keep moving.

b)

gravity is trying to slow it down.

c)

it needs a force to balance friction and air resistance.

d)

weight balances friction.

20.

A state of matter in which a substance has neither a definite shape or volume

a)

liquid

b)

gas

c)

solid

d)

viscosity

21.

Which of the following statements in NOT correct?

a)

Solids can be subjected to shear stresses.

b)

Fluids display the property of flow.

c)

Forces act on a fluid in the same way they act on a solid.

d)

The term fluid therefore includes liquids and gas.

22.

The term fluids generally applies to:

a)

solid and liquid

b)

liquid and gas

c)

solid and plasma

d)

water only

23.

The fluid on which the net force is zero is considered as static.

a)

TRUE

b)

FALSE

24.

A fluid at rest can resist a shear stress.

a)

TRUE

b)

FALSE

25.

A fluid is a substance which deforms continuously under the application of a __________.

a)

shear stress

b)

compressive stress

c)

tensile stress

d)

normal stress

26.
The upward force exerted by a fluid on a submerged object.
a)
gravity
b)
anti-gravity
c)
buoyant force
d)
lift
27.
The rule that when force is applied to a confined fluid, the increase in pressure is transmitted equally throughout.
a)
pascal's principle
b)
bernoulli's principle
c)
archimedes' principle
d)
Newton's Law
28.
The rule that states that a stream of fast-moving fluid exerts less pressure than the surrounding fluid.
a)
pascal's principle
b)
bernoulli's principle
c)
archimedes' principle
d)
Newton's Law
29.
A system that multiplies force by transmitting pressure from a small surface area through a confined fluid to a larger surface area.
a)
hydraulic system
b)
archimedes system
c)
pressure system
d)
bernoulli effect
30.
An upward force.
a)
lift
b)
gravity
c)
life
d)
drag
31.
Which direction does buoyant force always push?
a)
downward
b)
upward
c)
all directions
d)
sponge bob
32.
The force exerted on a surface divided by the total area over which the force is exerted. Force / surface area
a)
Net Force
b)
velocity
c)
fluid force
d)
pressure
33.
Fluid pressure is directed
a)
in all directions.
b)
only upward.
c)
only downward.
d)
always sideways.
34.
Gasses exert pressure 
a)
randomly in varying directions.
b)
horizontally.
c)
evenly in all directions.
d)
vertically.
35.
Water is about 1,000 times more ___ than air and therefore exerts greater pressure than air.
a)
dense
b)
heavy
c)
buoyant
d)
fluid
36.
An object is buoyed up when
a)
the buoyant force is less than the object's weight.
b)
the buoyant force is greater than the object's weight.
c)
the buoyant force equals the object's weight.
d)
there is high air pressure.
37.
The brake pedal is very small but the driver is able to stop the car because when pressing on the pedal 
a)
the pressure is exerted evenly through the fluid to all 4 brake pads.
b)
Pascal's principle is being demonstrated.
c)
this is hydraulics in action!
d)
all of these options.
38.
Why do solids maintain their shape, whereas fluids do not?
a)
because the molecules in solids maintain a regular pattern and move very rapidly
b)
because solids are denser than fluids
c)
because solids are under greater pressure than fluids
d)
because the molecules in solids maintain a regular pattern and only vibrate, or move very slowly
39.
Which of the following is a change that will not affect the pressure in a container?
a)
heating or cooling the fluid
b)
changing the material that the fluid´s container is made of
c)
changing the weight of the fluid
d)
increasing the volume of the fluid
40.
The pressure in a fluid is affected by which characteristic of that fluid?
a)
the amount of hydrogen atoms in the fluid
b)
the weight of the fluid
c)
the gravity of the fluid
d)
the amount of oxygen atoms in the fluid

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