❓ Good question or not?

The answers, and why

1. Is this a good science fair question? "Which floor makes a ball bounce highest?" Yes: it changes one thing and measures one. Yes. You change the floor the ball lands on and measure how high the ball bounces.

2. Is this a good science fair question? "Which colour is the prettiest?" No: you can't measure the answer. Pretty is an opinion. A fair question has an answer you can count or measure.

3. Is this a good science fair question? "Does more air make a balloon rocket go farther?" Yes: it changes one thing and measures one. Yes. You change how big the balloon is blown up and measure how far the balloon rocket travels along the string.

4. Is this a good science fair question? "Does a baking soda volcano erupt?" No: nothing is changed and measured. It always does, so nothing is tested. Change how much baking soda goes in and measure the foam, and it becomes a question.

5. Is this a good science fair question? "Which paper towel soaks up the most water?" Yes: it changes one thing and measures one. Yes. You change the kind of paper towel and measure how many spoonfuls of water it holds.

6. Is this a good science fair question? "What happens if I change the ramp, the car and the floor?" No: it changes lots of things at once. With three changes at once you can't tell which one made the difference. Change one.

7. Is this a good science fair question? "Which cup keeps an ice cube from melting longest?" Yes: it changes one thing and measures one. Yes. You change what the cup is made of and measure how long the ice cube takes to melt all the way.

8. Is this a good science fair question? "Are paper airplanes fun?" No: you can't measure the answer. Fun is a feeling. How far each one flies is something you can measure.