Grade 8 Fluids (Density, viscosity, Buoyancy, Hydraulics, Pneumatics)

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  • 1/12 Questions

    An important characteristic of fluids is that they can flow.  Fluids can do this because...

    • Particles in fluids are slippery
    • Particles in fluids can move around each other
    • Particles in fluids have a coating
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About This Quiz

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!

Grade 8 Fluids (Density, viscosity, Buoyancy, Hydraulics, Pneumatics) - Quiz

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  • 2. 

    Gases are more compressible than liquids because...

    • The particles in gas are more attracted to each other

    • The particles in gas are smaller

    • The particles in gas are farther apart

    Correct Answer
    A. The particles in gas are farther apart
    Explanation
    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.

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  • 3. 

    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?

    • Heat up the bottle

    • Put the bottle in the fridge

    • Shake the bottle with more force

    Correct Answer
    A. Heat up the bottle
    Explanation
    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.

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  • 4. 

    In what states of matter can you find fluids?

    • Solids, gases and liquids

    • Gases and solids

    • Gases and liquids

    • Liquids and solids

    Correct Answer
    A. Gases and liquids
    Explanation
    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.

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  • 5. 

    Which would be easier?

    • Holding a heavy object up on land

    • Holding a heavy object in water

    • They're both the same, it depends on the arm

    Correct Answer
    A. Holding a heavy object in water
    Explanation
    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.

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  • 6. 

    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?

    • 20g

    • 5g

    • 15g

    Correct Answer
    A. 20g
    Explanation
    The mass of the object can be calculated using the formula:
    Mass=Density×Volume
    In this case, the density of the object is given as 2 g/mL and the volume it displaces is 10 mL
    Substitute these values into the formula:
    Mass=2 g/mL×10 mL
    Mass=20 g
    Therefore, the mass of the object is 20 g.

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  • 7. 

    Because of the way the particles are, ____________________(hydraulics, pneumatics) is more efficent.

    Correct Answer
    hydraulics
    Hydraulics
    Explanation
    Because of the way the particles are, hydraulics is more efficient.

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  • 8. 

    The particles in water are ____________ oil

    • Farther apart than in

    • The same as in

    • Closer together than in

    Correct Answer
    A. Closer together than in
    Explanation
    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.

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  • 9. 

    Hydraulics and pneumatics are very similar.  How are they different?

    • Hydraulics uses water, pneumatics uses a gas

    • Hydraulics uses a liquid, pneumatics uses a gas

    • Hydraulics uses a gas, pneumatics uses a liquid

    • Hydraulics uses a liquid, pneumatics uses a solid

    Correct Answer
    A. Hydraulics uses a liquid, pneumatics uses a gas
    Explanation
    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.

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  • 10. 

    Water is ________________ oil.

    • Denser than

    • Less dense than

    • Has the same density as

    Correct Answer
    A. Denser than
    Explanation
    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.

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  • 11. 

    If 2 objects with the same mass are placed into water tanks... -object A displaces 10mL of water -object B displaces 15mL of water Which object is denser?

    • Object A

    • Object B

    Correct Answer
    A. Object A
    Explanation
    Given that both objects have the same mass but displace different volumes of water:
    Object A displaces 10 mL of water
    Object B displaces 15 mL of water
    The volume of water displaced by an object is directly related to the volume of the object itself when immersed in water. Therefore:
    The volume of Object A is 10 mL
    The volume of Object B is 15 mL
    Since density is inversely proportional to volume (given the same mass), the object with the smaller volume (Object A) has a higher density. Thus, Object A is denser than Object B.

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  • 12. 

    Viscosity is caused by the ...

    • Thickness of a fluid

    • The attraction between the particles in a fluid

    • The spaces between the particles in a fluids

    Correct Answer
    A. The attraction between the particles in a fluid
    Explanation
    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.

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  • Current Version
  • Dec 02, 2024
    Quiz Edited by
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  • Dec 08, 2009
    Quiz Created by
    Chiling
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