Fair Test

A stapler is used to staple 100 papers, it jams 5 times during the trial. A different brand of stapler performs the same test; it jams 22 times. What things should be kept constant in this experiment? Select all that apply.

• brand of stapler

• person using the staplers

• type of paper being stapled

• brand of staples

Mosquito repellent is sprayed on one arm and the other arm is not sprayed. The number of mosquito bites is counted after 2 hours. What is the independent variable?

• mosquito bites

• repellant

• 2 hours

In a fair test you should...

• only change one variable (the independent variable)

• change all the variables 

• change no variables 

Tags

NGSS.MS-PS2-2

Matt wants to test which liquid freezes first –Milk or Pepsi. He poured 10 ml of milk in one glass and 10 ml of Pepsi in another glass of same size and kept them in a freezer. After every 10 minutes he checked his freezer and recorded his observations. Pepsi froze first, and then milk. Which factor has he kept same?

• a) Type of liquid

• b) Time it took to freeze

• c) amount of liquid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A fair test means our results are...

• valid

• repeatable 

• both

Tags

NGSS.MS-LS2-4

NGSS.MS-PS2-2

What is the part of the experiment that is left alone or “natural", and is used to compare back to?

• Independent Variable

• Dependent Variable

• Control Group

• Experimental Group 

In a fair test, what is the variable that is deliberately changed to observe its effect?

• Independent Variable

• Dependent Variable

• Control Variable

• Constant Variable

Which of the following is essential to ensure a fair test in an experiment?

• Changing multiple variables at once

• Keeping all variables constant

• Changing one variable while keeping others constant

• Not recording observations

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

During an experiment to test plant growth, which factor should be kept constant to ensure a fair test?

• Amount of sunlight

• Type of soil

• Amount of water

• All of the above

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Why is it important to repeat an experiment multiple times in a fair test?

• To increase the sample size

• To ensure the results are consistent

• To change the variables each time

• To make the experiment more complex