6.6

Boat A floats on water, but boat B sinks. The boats are made of different materials. Which statement(s) must be correct?

• only

• only

• and only

• and only

Three liquid samples are put into a cylinder. Arrange the samples in the order of its position. The top one is first.

• P > Q > R

• Q > P > R

• R > P > Q

• R > Q > P

Tags

NGSS.MS-PS1-2

What causes a submarine to sink?

• Water entering the ballast tank

• Water leaving the ballast tank

• Air entering the ballast tank

• People entering the submarine

Tags

NGSS.MS-PS2-4

Why do fish balls float after cooking?

• Air pressure inside fish ball increases

• Atmospheric pressure decreases

• Fish ball expands

• Air in the fish ball expands

Tags

NGSS.MS-PS1-4

Which two physical properties of minerals can be observed by scratching the mineral against other substances?

• Color and streak

• Luster and streak

• Streak and hardness

• Hardness and luster

The ability of one mineral to scratch another mineral is determined by the mineral’s —

• luster

• streak

• color

• hardness

A student is testing several minerals in science class. First, the student scratched the

minerals across a tile and then scratched the minerals with a copper penny and a steel tool.

What physical properties is the student testing?

• Color and state

• Streak and hardness

• Luster and conductivity

• pH and fracture

A student found a pretty rock while hiking with her family. She discovered that the rock will scratch glass, but not her steel knife. According to the Mohs Hardness Scale shown above, what does the student know about the rock?

• It is harder than quartz, but softer than topaz.

• It is harder than corundum, but softer than gypsum.

• It is harder than calcite, but softer than fluorite.

• It is harder than fluorite, but softer than quartz.

What is the pH value of a neutral solution?

• 6.6

• 7.0

• 8.0

• 5.5

Which of the following pH values indicates an acidic solution?

• 6.6

• 7.0

• 8.0

• 9.5