Fast Science Review

A constant is:

• something that is changed on purpose

• something that scientists do not yet understand

• something that stays the same

• something that changes because of something else

Why should an experiment be repeated?

• to form a hypothesis

• to reduce the chance of error

• to change controls

• to identify the problem

Tags

NGSS.MS-LS2-4

The outside layer of the earth is called ______________________.

• core

• crust

• mantle

• outer core

What will happen when these magnets are brought close together?

• They will attract each other.

• They will repel each other.

• Both magnets will turn to the left

• Both magnets will turn to the right

Tags

NGSS.MS-PS2-3

Which form of matter lacks a fixed shape but has a definite volume?

• Gas

• Solid

• Liquid

• Plasma

Tags

NGSS.MS-PS1-4

Two wires carrying electricity can create a spark if they come too close together. This spark can start a fire. Wires carrying electricity are usuallly covered  with plastic to keep them from starting a fire. Why does the plastic keep electricity from starting a fire?

• Plastic is a good insulator.

• Plastic can melt when heated.

• Plastic is softer than wire.

• Plastic conducts electricity.

Tags

NGSS.MS-PS2-3

Erosion is one of the processes involved in the formation of sedimentary rock. Which of these best describes the process of erosion?

• Rocks are broken into smaller pieces that remain in the same location.

• Pressure compacts layers of sediment and turns them into rock.

• Pieces of rock or soil are carried from one place to another.

• Sediment grains fall to the bottom of a lake to form sedimentary layers.

Tags

NGSS.MS-ESS2-2

A student made a list of activities that involve energy.  
-
Sharks chasing a school of fish
A toaster heating bread
A cell phone charging
A tree limb falling to the ground
Tomato plants absorbing sunlight
A canoe floating down a river
-
Which activities on the list are examples of the use of mechanical energy? 

• Activities 1, 4, and 6 

• Activities 2, 4, and 5

• Activities 1 and 2 

• Activities 3, 5, and 6 

Tags

NGSS.MS-PS2-2

A student combined powdered paint with water to make a small amount of a blue liquid paint mixture. The student left the paint mixture in an open container. Several days later the student found the container and observed that changes had occurred. What most likely happened to the mixture?

• The container was empty after the mixture evaporated into the air.  

• The paint evaporated, leaving only clear water in the container.

• The water evaporated, leaving only a dry blue solid in the container.  

• The liquid paint mixture was lighter in color after some water evaporated.  

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student puts four objects in a bucket filled with water. The objects are listed below. 
-
 Plastic ball
Glass marble
Metal paper clip
Wood block 
-
Which two objects are most likely less dense than the water?

• Wood block and metal paper clip

• Plastic ball and glass marble

• Metal paper clip and glass marble

• Wood block and plastic ball