Science Fair Sleuths

Question 1 · multiple choice

A plant-growth test changes only the amount of light. What should stay equal?

The final plant heights Plant type and water supply Only the labels' colours The measured results

Question 2 · multiple choice

Which instrument best measures 25 mL of water?

Stopwatch Graduated cylinder Metre ruler Bathroom scale

Question 3 · multiple choice

A scale shows 2 g before anything is added. What should you check first?

The room's paint The ruler's length Its zero setting The sample's name

Question 4 · multiple choice

Why repeat a paper-plane trial several times?

To see variation and improve confidence To remove the need to measure To make the longest flight certain To force identical results

Question 5 · multiple choice

Four plants receive fertilizer and four do not. The untreated group is a…

Different species necessarily Guaranteed failure Measuring instrument Comparison control

Question 6 · true false

True or false: A result that disagrees with a prediction is automatically a failed experiment.

True False

Question 7 · multiple choice

A graph shows ice-cream sales and sunburn rising together. What is a sensible explanation?

Hot sunny weather may affect both Ice cream directly causes every sunburn Sunburn produces ice cream The graph proves either causes the other

Question 8 · multiple choice

A student changes water, soil and light together. Why is the conclusion weak?

Three changes always cancel There are too few labels The cause cannot be isolated Plants never respond to conditions

Question 9 · multiple choice

A test sample is selected only from the tallest pupils. It poorly represents…

The selected pupils' heights The ruler's centimetres The meaning of tall The whole school's heights

Question 10 · multiple choice

Which report is most reproducible?

One giving only the winner One giving quantities and exact steps One giving only the author's opinion One giving only a photograph