Independent Variable or Dependant Variable? check my work...some tough questions inside?

Question

1) the group that receives the placebo is known as the ____ (IV or DV?)
2) In an experiment to test the effects of varying levels of light on performance, the _____ is the amount of light. (IV or DV?)
3) In an experiement, the measurable aspect of behavior of a participant is known as the _____ (IV or DV?)
4) In an experiment, a researcher manipulates one variable to see how it affects a second variable known as the ____ (IV or DV?)
5) In an experiment, a researcher manipulates a variable known as the ______ to see how it affects a second variable. (IV or DV?)

My Answers:
1) IV
2) IV
3) DV
4) DV
5) IV

I get these confused even with the explanations. I would appreciate it if someone can show me another way to look at these research values (a mnemonic or trick to remember IV and DV). More formally, it would be nice if you can check my answers too...just to see if I'm doing it correctly. Thanks!

I'll reward for Best Answer (I promise)

Answer 1

Your answers appear to be correct.
Just remember that you set up the experiment with an independent variable. It's the factor that you change on purpose. You can think of the dependent variable as the factor that you measure or count -- the result. It "depends" on what you changed when you set up the experiment.