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physics

Total questions: 62

Worksheet time: 55mins

Name
Class
Date
1.

Branch of physics that deals with the characteristics of fluids at rest, particularly with the pressure in a fluid or exerted by a fluid (gas or liquid) on an immersed body.

a)

Hydrodynamics

b)

Buoyancy

c)

Hydrostatics

d)

Fluid

2.

In applications, the principles of __________ are used for problems relating to pressure in deep water (pressure increases with depth) and high in the atmosphere (pressure lessens with altitude).

a)

Fluid

b)

Hydrostatics

c)

Hydrodynamics

d)

Buoyancy

3.

Branch of physics that deals with the characteristics of fluids at motion, particularly with the ocean currents, wave patterns, and the flow of water through pipes.

a)

Hydrostatics

b)

Fluid

c)

Viscosity

d)

Hydrodynamics

4.

Refers to the mass per unit volume of a fluid. It is an important property of a fluid, as it affects its behavior in a variety of ways.

a)

Density

b)

Pressure

c)

Buoyancy

d)

Depth

5.

Scalar quantity that describes the force per unit area exerted by a fluid. It is expressed in units of force per unit area, such as N/m2

a)

Buoyancy

b)

Density

c)

Depth

d)

Pressure

6.

In hydrostatic the weight of the fluid divided by the area supporting it. This definition highlights the relationship between pressure and the weight of the fluid, as well as the role of the area over which the pressure is exerted.

a)

Density

b)

Depth

c)

Pressure

d)

Buoyancy

7.

This principle describes the behavior of fluids under pressure. It states that the pressure at any point in a fluid at rest is transmitted equally in all directions and is independent of the shape of the container. In other words, the pressure at a given point in a fluid is the same in all directions and is not affected by the shape or size of the container.

a)

Pascal

b)

Bernoulli

c)

Archimedes

d)

Poiseuille

8.

This principle describes the behavior of objects immersed in a fluid. It states that the buoyant force exerted on an object submerged in a fluid is equal to the weight of the fluid that the object displaces. In other words, the buoyant force is proportional to the volume of fluid displaced by the object.

a)

Pascal

b)

Poiseuille

c)

Bernoulli

d)

Archimedes

9.

This principle describes the relationship between pressure and velocity in a fluid flowing through a pipe or over a surface. It states that as the velocity of a fluid increases, its pressure decreases, and vice versa.

a)

Bernoulli

b)

Poiseuille

c)

Pascal

d)

Archimedes

10.

This principle describes the flow of fluid through a circular pipe. It states that the rate of fluid flow through a pipe is directly proportional to the pressure difference across the pipe and inversely proportional to the fluid's viscosity and the length of the pipe, and is proportional to the fourth power of the radius of the pipe.

a)

Pascal

b)

Poiseuille

c)

Archimedes

d)

Bernoulli

11.

Is a force exerted on an object when it is submerged in a fluid. Is the force that opposes the object's weight and is responsible for making the object float or sink. Is equal to the weight of the fluid that the object displaces.

a)

Fluid dynamics

b)

Flow rate

c)

Buoyant force

d)

Cohesive forces

12.

The forces that cause fluids to stick together and resist separation. These forces are the result of intermolecular forces between the fluid molecules and are responsible for the fluid's surface tension. Is the property of a fluid that makes it behave as if its surface is a thin, elastic membrane.

a)

Flow rate

b)

Fluid dynamics

c)

Buoyant force

d)

Cohesive forces

13.

Is a measure of the volume of fluid that passes through a given cross-sectional area of a pipe or channel per unit of time. It is commonly expressed in units of volume per unit of time, such as liters per second (L/s) or cubic meters per hour (m3/h). It provides information about the speed and volume of fluid that is moving through a pipe or channel.

a)

Cohesive forces

b)

Flow rate

c)

Fluid dynamics

d)

Buoyant force

14.

Branch of physics that deals with the study of fluid behavior and the forces that affect it. It is concerned with the behavior of liquids and gases, and the ways in which they flow and interact with solid boundaries and with each other.

a)

Flow rate

b)

Cohesive forces

c)

Buoyant force

d)

Fluid dynamics

15.

As you climb up a mountain what happens to the air pressure?

a)

stays the same

b)

decreases

c)

increases

d)

disappears

16.

What is the hydrostatic pressure due to a liquid of density 2000 kg/m3, at a depth of 50m?

a)

50 Pa

b)

2000 Pa

c)

100 000 Pa

d)

1 000 000 Pa

17.

What is the formula for density (плътност) ?

a)

density = mass x volume

b)

density = mass / volume

c)

density = mass + volume

d)

density = mass - volume

18.

Which liquid is the least dense?

a)

oil

b)

water

c)

syrup

d)

plastic bottle

19.

Joseph weighs 290N and displaces 300N of water as he swims under water in a pool. What is the force FA on Joseph?

a)

10 N upward

b)

300 N upward

c)

290 N downward

d)

590 N downward

20.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
21.
Pressure is measured in what units
a)
Newtons
b)
m/s
c)
Pascals
d)
Moles
22.
True or false:
Pressure depends on depth
a)
true
b)
false
23.
What is the instrument called that measures air pressure?
a)
thermometer
b)
ruler
c)
yard stick
d)
barometer
24.
___________is the result of the weight of a column of air pushing on an area.
a)
air pressure
b)
density
c)
volume
d)
none of the above
25.

Check all that are considered FLUIDS.

a)

gas

b)

liquid

c)

solid

26.

When you increase your depth under water, the water pressure on your body _____.

a)

increases

b)

decreases

c)

stays the same

27.

Where would you find the largest pressure?

a)

at the bottom of the Pacific Ocean

b)

at the top of Mt. Everest

c)

at sea level

d)

Pressure is the same everywhere on Earth.

28.

Mass is measured in _____, while weight is measured in _____.

a)

kg, N

b)

N, kg

c)

m/s, m/s2

d)

m/s2 , m/s

29.
This instrument measures air pressure
a)
thermometer
b)
anemometer
c)
barometer
d)
wind vane
30.

What is the pressure under a liquid of density 11.35 kg/m3, at a depth (height) of 65m?

a)

7230 Pa

b)

0.175 Pa

c)

737.75 Pa

d)

65 Pa

31.

What is the SI unit use for hydraulic pressure?

a)

Kg/m3

b)

Pa

c)

Litre

d)

Kilometer

32.
Where is pressure the greatest on the dam?
a)
D
b)
C
c)
B
d)
A
33.
Density of air is greater at high altitudes.
a)
true
b)
false
34.
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.
35.

Buoyancy is the tendency for objects to float in a fluid. We consider buoyancy the...

a)

Un-gravity force

b)

The upward force

c)

Gravitational pull

d)

Downwards pull on an object

36.
The buoyant force on floating objects equals the weight of the floating object 
a)
true
b)
false
37.
If an object weighing 50.0 N displaces a volume of water with a weight of 10.0 N, what is the buoyant force on the object?
a)
10 N
b)
60 N
c)
40 N 
d)
20 N 
38.

When the weight of an object is greater than the upthrust (buoyant force), the object will ...

a)

Sink

b)

Float

c)

Expand

d)

Shrink

39.
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. 
40.

What direction is the buoyant force (upthrust) in?

a)

Downward

b)

Left

c)

Right

d)

Upward

41.

According to Archimedes, the loss in weight when an object placed in a liquid is equal to

a)

weight of liquid

b)

weight of the body

c)

weight of the liquid displaced by the immersed part of the body

d)

density of liquid

42.
Fluids are any substances that flow and that take the shape of their container.
a)
True
b)
False
43.

How many kPa are in 7,390 atm?

a)

748,607 kPa

b)

748,607,000 kPa

c)

72.95 kPa

d)

7,390 kPa

44.
Compared to a man standing on a tall mountain, a man standing at sea level 
a)
has less atmospheric pressure on him.
b)
has more atmospheric pressure on him. 
c)
weighs less. 
d)
has more mass. 
45.
Which of these animals would probably cause the greatest pressure on the ground?
a)
A fat cow with big feet.
b)
A fat cow with small feet.
c)
 A calf with big feet.
d)
A calf with small feet.
46.
If a barometer reads 800 mm Hg what is the atmospheric pressure in atm?
a)
1 atm
b)
608,000 atm
c)
0.95 atm
d)
1.05 atm
47.
To pressure ___________ as you go deeper underwater?
a)
increases
b)
decreases
c)
stays the same
48.

Pressure at a depth h in a liquid is mathematically expressed as ____, where ρ and g are density of the liquid and acceleration due to gravity respectively.

a)

P= mgh

b)

P = ρg/h

c)

P = ρgh

d)

P = ρmg

49.

Find the pressure on the bottom of a swimming pool that measures 8.0 m by 15.0 m and has a uniform depth is 2.0 m. Note: the density of water is 1000 kg/m³.

a)

5.6 x 10³ Pa

b)

1.96 x 10⁴ Pa

c)

6.83 x 10⁵ Pa

d)

2.74 x 10² Pa

50.

If an external pressure is exerted at the surface, this must also be taken into account. A SCUBA diver descends 15 m into a lake. If the pressure at the surface of the lake is 101300 Pa calculate the water pressure at a 15 m depth. density of fresh water = 1000 kg/m3

a)

141.3 kPa

b)

1.0813 kPa

c)

591.3 kPa

d)

248.3 kPa

51.

Ouch! You stepped on my foot! That is, you put a force of 550 N in an area of 9 cm² on the tops of my feet! The pressure on my feet was 611111 Pa. What is the ratio of this pressure to atmospheric pressure?

9 cm3 = 0.0009 m3 & 1 atm = 101325 Pa

a)

2.5 atm

b)

8.2 atm

c)

6 atm

d)

4 atm

52.

A brick of gold is 10.0 cm wide, 10.0 cm high and 20.0 cm long. The density of gold is 19.3 g/cm³. What pressure does the brick exert on the table if it is resting on its end?

a)

1890 Pa

b)

3780 Pa

c)

3860 Pa

53.

A brick of gold is 10.0 cm wide, 10.0 cm high and 20.0 cm long. The density of gold is 19.3 g/cm³. What pressure does the brick exert on the table if it is resting on its side?

a)

1890 Pa

b)

3780 Pa

c)

3860 Pa

54.

A rectangular block weighing 150 N is resting on a flat surface. If the area of contact between the block and the surface is 0.25 m², what is the pressure (Pa) exerted by the block on the surface?

(a)  

55.

A woman wearing high heels steps onto a soft wooden floor. Each heel has a cross-sectional area of 1.5 cm² and the woman's weight is 600 N. Calculate the pressure (Pa) exerted on the floor by one heel. 1 m2 = 10000 cm2

(a)  

56.

A cylindrical piston has a diameter of 8 cm and exerts a force of 400 N on the fluid inside a hydraulic system. Calculate the pressure (Pa) applied by the piston on the fluid. Hint: area of a circle, 1 m2 = 10000 cm2

(a)  

57.

A physics book is lying flat on a table. The book weighs 10 N and has dimensions of 20 cm by 30 cm. What is the pressure (Pa) exerted on the table? 1 m2 = 10000 cm2

(a)  

58.

Where is the pressure the greatest?

a)

A

b)

B

c)

C

59.

An oil storage tank is filled with oil to a height of 10.0 meters. The density of the oil is 850 kg/m3. Calculate the pressure (Pa) at the base of the tank due to the oil.

(a)  

60.

A diver descends to a depth of 5 meters in seawater. If the density of seawater is 1025 kg/m3, what is the pressure (kPa) exerted on the diver at this depth?

(a)  

61.

Which house has the highest water pressure if all pipe diameters are equal?

a)

A

b)

B

62.

A water tower is filled to a height of 40 meters above the ground. The water is intended to supply a small town below. Given that the density of water is 1000 kg/m3, calculate the hydrostatic pressure that the water exerts at the base of the tower due to its height. Then convert your answer to pounds per square inch (psi): 1 psi = 6900 Pa

(a)