Question 1

Which is the BEST comparison of static electricity and electric current?

Accepted Answer

Static electricity involves the build-up of electrons in an object, while electric current involves the flow of electrons through wires.

Answer

Static electricity flows through wires, while electric current jumps across wires.

Answer

Static electricity involves open circuits, while electric current involves closed circuits.

Answer

Static electricity begins with objects that have a negative charge while electric current begins with objects that have a positive charge.

Question 2

Which statement about vertebrates is true?

Accepted Answer

Vertebrates have skeletons.

Answer

Vertebrates live only on land.

Answer

Vertebrates do not have backbones.

Answer

Most animals are vertebrates.

Question 3

Where will ice MOST LIKELY weather Earth's surface features?

Accepted Answer

on land where rain falls and temperatures vary above and below freezing.

Answer

on land where little rain falls and temperatures are below freezing

Answer

on land where much rain falls and temperatures are warm

Answer

on the ocean floor below icebergs

Question 4

Which of these actions to substances can be reversed?

Accepted Answer

mixing

Answer

burning

Answer

tarnishing

Answer

rusting

Question 5

Which statement describes how deposition builds up the surface of a floodplain?

Accepted Answer

a river flows over its banks and slows down

Answer

lava flows from a volcano and piles up

Answer

rainwater seeps into the ground and freezes

Answer

a river slows down as it flows into the ocean.

Question 6

Which statement supports the argument that some microorganisms are helpful?

Accepted Answer

People use bacteria to make cheese

Answer

Farmers spray their crops with chemicals to prevent the growth of fungi

Answer

Algae live in rivers, lakes, and oceans

Answer

Many diseases are caused by viruses

Question 7

A scientist plans to make models of three kinds of cells: oak leaf, squirrel muscle, and fern leaf.

Which model(s) will have organelles that contain chlorophyll?

Accepted Answer

the fern leaf cell and the oak leaf cell

Answer

only the fern leaf cell

Answer

the oak leaf cell, the squirrel muscle cell, and the fern leaf cell

Answer

only the squirrel muscle cell

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