What is a variable in the context of an experiment?

• A factor that remains unchanged throughout the experiment.

• A factor that is measured at the end of an experiment.

• A factor that is monitored during an experiment or investigation.

• A factor that is always manipulated by the experimenter.

How many main kinds of variables are typically found in experiments?

• One

• Two

• Three

• Four

Which type of variable is chosen by the experimenter to be investigated or manipulated?

• Dependent variable

• Controlled variable

• Independent variable

• Constant variable

Which type of variable changes as a result of a change in the independent variable?

• Controlled variable

• Dependent variable

• Constant variable

• Manipulated variable

In an experiment investigating "How does the time spent heating a beaker of water affect its temperature?", what is the independent variable?

• The temperature of the water.

• The type of beaker used.

• The time heat is applied.

• The volume of water.

If an experiment investigates "What is the effect of time spent studying on test results?", what is the dependent variable?

• The amount of time spent studying.

• The test results.

• The study environment.

• The type of test.

What is the primary characteristic of a controlled variable?

• It is the variable that is measured.

• It is kept constant during the investigation.

• It is the variable that is changed by the experimenter.

• It is the outcome of the experiment.

Why is it important to control variables in an experiment?

• To make the experiment more complex.

• To ensure the test is fair and the experiment is valid.

• To reduce the number of measurements needed.

• To allow multiple independent variables to be tested simultaneously.

In an experiment where the volume of water given to a plant is varied to observe its growth rate, which of the following would be a controlled variable?

• The maximum height of the plant.

• The type of soil the plant is grown in.

• The volume of water given.

• The growth rate of the plant.

In an experiment to determine "What is the effect of temperature on fish growth?", what is the independent variable?

• The length of the fish after 1 month.

• The type of fish feed.

• The water temperature.

• The frequency of water change.