Science Diagnostic Examination

Why is it important to repeat an experiment?

• To impress others

• To make it more fun

• To verify if the results are reliable

• To waste materials

A student observes that plants near a window grow better. What question best shows scientific thinking?

• Are all windows clean?

• Why do plants prefer sunlight?

• Are flowers prettier near windows?

• What color is the flower?

You want to test if fertilizer affects plant growth. What must you keep the same in the experiment?

• Type of fertilizer

• Height of the plant

• Amount of sunlight and water

• Kind of flowerpot

Why do scientists use measuring tools instead of just guessing?

• Tools are more colorful

• To be more accurate and consistent

• Guessing is boring

• It's required by law

If a conclusion does not match the hypothesis, what should the scientist do?

• Hide the result

• Change the data

• Accept the result and revise the hypothesis

• Ignore the experiment

You see ice melt into water. What kind of change is this?

• Chemical

• Unexpected

• Physical

• Reversible

Which example shows a chemical change?

• Tearing paper

• Melting chocolate

• Rusting of iron

• Freezing juice

What can you infer if a solid turns into liquid when heated?

• A new substance forms

• The object disappears

• The substance is melting

• The substance is destroyed

A student weighs a ball before and after cutting it in half. What will happen to the mass?

• It becomes more

• It becomes zero

• It stays the same

• It becomes negative

Why does oil float on water?

• Oil is thicker

• Oil is heavier

• Oil has less density

• Oil dissolves in water