Grade 8 Science: Fluids Practice Test and Homework Check

Make sure the unit questions are completed between this week and next. I will start checking after Monday during your science periods.

Link to unit outline: http://bedfordroom16.blogspot.ca/2013/11/science-grade-7-and-8-unit-outlines.html

There is a vocabulary section at the bottom of the outline.

Practice Test Questions:

Define:

Viscosity, Hydraulics, Pneumatics, Density, Hydrometer

Fill in the Blank:

Two liquids are poured into the same glass. After sitting, one liquid settles to the bottom. This
liquid is _________ than the top liquid.

There are 2 bottles of chocolate sauce. One is kept in the refrigerator, and the other in the
cupboard. When I try to pour the chocolate sauce out, the sauce from the _____ is
less viscous.

A boat can float because water pushes up on it. This force is called ___________.

Steel is denser than water, but because boats are mostly filled with _________, it allows
them to float.

Explain why solids that flow (eg jello) are not fluids.

Which fluid can be compressed more, liquid or gas. Explain your choice using the particle
theory.

Two items with the same mass are placed in identical water tanks. Item 1 displaces 50mL
of water. Item 2 displaces 65mL of water. Explain why there is a difference in the water
displaced. What can be inferred about the density of the 2 items?

An object is dropped into two types of fluids. In fluid A, the object sinks. In fluid B, the
same object floats. Using proper terms and particle theory, explain what happened.

How would you use water displacement to find the mass of an object? (The density of the
water is 1g/mL)



Give an example of viscosity as it is used in the real world. Be specific and explain your
understanding.