Experimental variables quiz

The number of variables that should be allowed to change in a well designed, controlled experiment is:

• none
• 2
• 1
• dependent on the type of experiment

Tags

NGSS.MS-PS2-2

In a controlled experiment, the independent variable is

• the results of the experiment
• the variable that stays the same
• changed to test the hypothesis
• always time

Tags

NGSS.MS-PS2-2

What happens to the dependent variable in a controlled experiment?

• It changes as the independent variable changes.
• It does not change.
• It is supported or disproved.

A student has a wagon of a certain mass. He plans to put different amounts of force on it and measure how the acceleration of the wagon changes. In his investigation, the independent variable is

• the acceleration of the wagon
• the force put on the wagon
• the mass of the wagon
• the mass of the student

Tags

NGSS.MS-PS2-2

In an experiment to find out how the height from which a student drops a ball affects how high the ball bounces, the independent variable is the

• height from which the ball is dropped
• height that the ball bounces
• diameter of the ball
• force acting on the ball

Tags

NGSS.MS-PS3-2

If you were testing how well different dish soap cleaned grease, the independent variable would be the:

• dishes
• water
• dish soap
• types of grease

A student wants to conduct an experiment to find out how the length of time spent exercising affects heart rate. The dependent variable will be

• breathing rate
• heart rate
• time spent exercising
• the kind of exercise

A student predicted that the amount of sunlight a sunflower plant receives determines the number of sunflower seeds the plant produces. In her experiment, the number of seeds produced is the

• dependent variable
• independent variable
• controlled variable

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

In an experiment studying how increasing amounts of acid rain affect the number of organisms in a pond, which of the following would be the dependent variable?

• number of organisms in pond water
• acid rain and non-acid rain
• a mixture of pond water and acid
• organisms in rainwater

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

One tank of goldfish is fed the normal amount, which is once a day; a second tank is fed twice a day; and a third tank is fed four times a day during a six-week study. The fishes’ body fat is recorded daily. In this experiment the controlled variables are

• body fat
• amount of food
• time of the day fish are fed
• number of fish in the tank