Grade 8 Fluids (Density, viscosity, Buoyancy, Hydraulics, Pneumatics)
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Fluids exist in different colors, weight, and viscosity. All throughout this week, we discussed the density, viscosity, buoyancy, hydraulics, and pneumatics. How much did you understand these subtopics? If you believe you understood much then all you have to do is take up this grade 8 tests and see if you need more study hours to properly understand the topics. All the best!
- 1.
In what states of matter can you find fluids?
- A.
Solids, gases and liquids
- B.
Gases and solids
- C.
Gases and liquids
- D.
Liquids and solids
Correct Answer
C. Gases and liquidsExplanation
Fluids can be found in both gases and liquids. Gases, such as air, are considered fluids because they have the ability to flow and take the shape of their container. Liquids, on the other hand, also have the ability to flow and take the shape of their container, making them fluids as well. Solids, however, do not have the ability to flow and therefore cannot be classified as fluids.Rate this question:
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- 2.
An important characteristic of fluids is that they can flow. Fluids can do this because...
- A.
Particles in fluids are slippery
- B.
Particles in fluids can move around each other
- C.
Particles in fluids have a coating
Correct Answer
B. Particles in fluids can move around each otherExplanation
Fluids can flow because particles in fluids can move around each other. Unlike solids, where particles are tightly packed and fixed in position, the particles in fluids have more freedom to move. This allows fluids to take the shape of their container and flow easily. The ability of particles in fluids to move around each other is what enables fluids to exhibit properties such as viscosity and fluidity.Rate this question:
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- 3.
Gases are more compressible than liquids because...
- A.
The particles in gas are more attracted to each other
- B.
The particles in gas are smaller
- C.
The particles in gas are farther apart
Correct Answer
C. The particles in gas are farther apartExplanation
Gases are more compressible than liquids because the particles in a gas are farther apart. In a gas, the particles have more space between them compared to the particles in a liquid. This allows for more flexibility in rearranging the particles and compressing the gas. In contrast, the particles in a liquid are closer together, which limits their ability to be compressed. Therefore, the greater distance between gas particles makes gases more compressible than liquids.Rate this question:
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- 4.
Water is ________________ oil.
- A.
Denser than
- B.
Less dense than
- C.
Has the same density as
Correct Answer
A. Denser thanExplanation
Water is denser than oil because water molecules are closely packed together, resulting in a higher mass per unit volume compared to oil. This higher density causes water to sink when mixed with oil, as oil molecules are less tightly packed and have a lower mass per unit volume.Rate this question:
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- 5.
The particles in water are ____________ oil
- A.
Farther apart than in
- B.
The same as in
- C.
Closer together than in
Correct Answer
C. Closer together than inExplanation
The correct answer is "closer together than in". This is because water molecules are held together by hydrogen bonds, which result in a relatively high density of particles in water compared to oil. As a result, the particles in water are closer together than in oil.Rate this question:
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- 6.
Viscosity is caused by the ...
- A.
Thickness of a fluid
- B.
The attraction between the particles in a fluid
- C.
The spaces between the particles in a fluids
Correct Answer
B. The attraction between the particles in a fluidExplanation
Viscosity is caused by the attraction between particles in a fluid. If attraction is strong, it's harder for the particles to flow past each other, so it flows slower. Thickness is a way to describe viscosity, but is more a result and not the cause. The spaces between the particles is not always an indicator of how viscous a fluid will be. For example, oil is more viscous than water. But, it is less dense.Rate this question:
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- 7.
If an object with a density of 2g/mL, is placed in a water tank and displaces 10mL of water, what is the mass of the object?
- A.
20g
- B.
5g
- C.
15g
Correct Answer
A. 20gExplanation
Density is measured in mass per volume (g/mL). In this case, it is 2g/mL. If the volume is 10mL, than the mass will be 20g. (20g/10mL = 2g/mL) Density=mass/volumeRate this question:
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- 8.
If 2 objects with the same mass are placed into water tanks...-object A displaces 10mL of water-object B displaces 15mL of waterWhich object is more dense?
- A.
Object A
- B.
Object B
Correct Answer
A. Object AExplanation
Since both objects have the same mass, object A is more dense. The water displaces shows the volume of an object. If object A displaces less water, its mass (same mass as B) needs less volume.Rate this question:
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- 9.
Hydraulics and pneumatics are very similar. How are they different?
- A.
Hydraulics uses water, pneumatics uses a gas
- B.
Hydraulics uses a liquid, pneumatics uses a gas
- C.
Hydraulics uses a gas, pneumatics uses a liquid
- D.
Hydraulics uses a liquid, pneumatics uses a solid
Correct Answer
B. Hydraulics uses a liquid, pneumatics uses a gasExplanation
Hydraulics and pneumatics are both methods of transmitting power using fluid pressure, but they differ in the type of fluid used. Hydraulics uses a liquid, typically oil or water, to transmit power and generate force. On the other hand, pneumatics uses a gas, usually compressed air, to transmit power and create motion. This difference in fluid type affects the performance, applications, and characteristics of both systems.Rate this question:
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- 10.
Because of the way the particles are, ____________________(hydraulics, pneumatics) is more efficent.
Correct Answer
hydraulics
HydraulicsExplanation
Because of the way the particles are, hydraulics is more efficient.Rate this question:
- 11.
Which would be easier?
- A.
Holding a heavy object up on land
- B.
Holding a heavy object in water
- C.
They're both the same, it depends on the arm
Correct Answer
B. Holding a heavy object in waterExplanation
Holding a heavy object in water would be easier because water provides buoyancy, which counteracts the force of gravity. This buoyant force reduces the effective weight of the object, making it feel lighter and easier to hold. In contrast, holding a heavy object up on land requires exerting more force against gravity without any buoyant support. Therefore, holding a heavy object in water would be less physically demanding.Rate this question:
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- 12.
I want to make an ice cream sunde. I can't get the caramel sauce out of the bottle. What could I try to make the caramel sauce come out of the bottle easier?
- A.
Heat up the bottle
- B.
Put the bottle in the fridge
- C.
Shake the bottle with more force
Correct Answer
A. Heat up the bottleExplanation
Heating up the bottle can help to make the caramel sauce come out easier because heat causes substances to expand. By heating up the bottle, the caramel sauce inside will become less viscous and flow more easily, making it easier to pour out of the bottle.Rate this question:
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