Gr. 8 Science - Fluids

What is viscosity?

• A measure of the flow rate of a gas.

• A measure of the flow rate of a liquid.

• A measure of a fluid's resistance to flow.

• None of the answers are correct.

Which of the following liquids is most viscous at room temperature?

• Water

• Vegetable oil

• Maple syrup

• Ketchup

Suppose you have two samples of olive oil. One sample is at 5^oC and the other sample is at 15^oC. In which sample is the viscosity greater?

• The sample at 5^oC.

• The sample at 15^oC

• Both samples of olive oil will have the same viscosity.

• There is not enough information to answer this question.

Liquids that are more dense tend to have ...

• a lower viscosity as the particles are closer together and the force of attraction is stronger.

• a higher viscosity as the particles are closer together and the force of attraction is stronger.

• a lower viscosity as the particles are farther apart and the force of attraction is weaker.

• a higher viscosity as the particles are farther apart and the force of attraction is weaker.

Density, a property of matter, can be found using which of the following relationships?

• Volume times mass.

• Volume divided by mass.

• Mass times volume.

• Mass divided by volume.

What is the density of 2 ml of mercury with a mass of 27.1 g ?

• 0.074 ml/g

• 54.5 gml

• 13.55 g/ml

• None of the answers are correct.

What is the difference between liquids and gases in terms of their compressibility?

• Gases are more compressible than liquids as the spaces between particles is bigger.

• Liquids are less compressible than gases as the force of attraction between the particles is weaker.

• Liquids are more compressible than gases as the the spaces between the particles is bigger.

• Gases are less compressible than liquids as as the force of attraction between the particles is stronger.

Pneumatic devices use ..

• liquids under pressure.

• gases under pressure.

• use both gases and liquids under pressure.

• None of the answers are correct.

Hydraulics is used to operate a car hoist in a mechanic's shop because ...

• the use of air would result in a "spongy" and unsafe hoist.

• pressurized liquids can transmit forces over a greater distance than gases can.

• All the answers are correct.

• liquids are incompressible.

A large, plastic bag has been filled to make a water bed. A student sits on one end of the bed, creating pressure. What pressure would there be in the middle and far end of the bed?

• The pressure is the same in the middle and at the far end as under the student.

• There is less pressure in the middle and even less at the far end.

• There is no pressure if the student sits still.

• There is more pressure in the middle and even more at the far end.