Practice of Science Assessment 2025

______ is when you repeat your experiment or do multiple trials of your experiment.

• replication

• repetition

______ is when another scientist or group of scientists repeat your experiment to see if they get the same results.

• repetition

• replication

Callie is doing an experiment to see which color bait attracts the most fish. She will ask other people to repeat her experiment. She will be practicing _________.

• Repetition

• Replication

Jamie is testing how the amount of salt affects how long it takes water to boil. She knows that to validate her conclusions, she must perform many trials. Jamie is practicing ________.

• replication

• repetition

Tags

NGSS.MS-PS1-2

The graph shows the amount of rain that fell each day for 5 days. If the pattern continues, what is the BEST prediction for Friday?

• There will be no rain on Friday
• There will be more than 4 cm of rain.
• There will be 2 cm of rain.
• There will be 3 cm of rain.

How did the weather change over the week?

• The rain went away
• The temperature went down
• The skies became clear
• It became warmer

Tags

NGSS.MS-ESS2-5

What was the largest number of paperclips held by a magnet?

• 9

• 10

• 11

• 12

Tags

NGSS.3-PS2-3

Which question can best be investigated by a scientist?

• Should I buy a red shirt or a green shirt?
• Does chocolate milk or plain milk taste better?
• Does a plant need sunlight to grow?
• Which feels softer, cat fur or dog fur?

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Scientific theories are based on

• general assumptions of how systems work.
• mathematical principles that can be proven true.
• large amounts of data collected over time.
• observations from within only one scientific discipline.

In 1897, Joseph Thomson discovered that atoms contained electrons.  He proposed a change in the atomic theory of that time, and the theory was modified because of his discovery.  Since Thomson’s discovery, atomic theory has been further modified.  What is the best explanation for why scientific theories are modified?

• Theories more than ten years old are usually out of date.
• Scientists want to prove that the work of other scientists is wrong.
• New evidence that supports a revision prompts scientists to modify earlier theories.
• So much information is available today that it is harder to focus research and disprove theories.

Tags

NGSS.MS-PS2-4