what are the controls of an experiment
Supplement. In scientific experiments, the use of controls allows to study one variable or factor at a time. It is, however, important that both the control and other (experimental) group(s) are exposed to the same conditions apart from the one variable under study.
1 Scientists can only change the independent variable; the dependent variable and control variables cannot be changed. 2  Scientists can only change the control variable; the dependent and independent variables cannot be changed.  About This Quiz & Worksheet. This quiz and worksheet combo helps you check your knowledge of scientific variables. During the quiz, you will be tested on the various types of variables. Use this worksheet/quiz combo to review: 1  The number of variables in a scientific method.  Different types of variables in a scientific experiment.