2023 District Science

Which one of the following is the LEAST dense?

• a lead pipe

• a brick

• nitrogen

• water

Examples include cement, wood, and metal. Which adjective below means you can’t see through an object because light can’t pass through it?

• crystalline

• opaque

• translucent

• transparent

Which of the following choices is a chemical change?

• burning wood

• crushing a can

• breaking glass

• boiling water

Below are four simple machines. An axe is an example of which one, used for lifting, tightening, or splitting?

• pulley

• screw

• lever

• wedge

Gravity is one of the four fundamental ones. Which of the following physics words, measured in newtons, is the push or pull on an object?

• energy

• speed

• velocity

• force

What part of the electromagnetic spectrum produced the medical image seen here?

• microwaves

• x-rays

• infrared radiation

• ultraviolet rays

Which one of the metals below is NOT magnetic?

• iron

• steel

• aluminum

• nickel

At over 1,800 miles thick, it makes up about 84% of Earth’s volume. Which choice below names this middle layer made mostly of solid rock?

• mantle

• inner core

• crust

• outer core

Some scientists call it a fossil resin. Which of the following substances is made from tree sap and can preserve the bodies of insects?

• petrified wood

• loam

• sand

• amber

Match each rock with its category.

• x-3, y-1, z-2

• x-2, y-1, z-3

• x-1, y-2, z-3

• x-3, y-2, z-1