Advanced Science Primary 5 Cycles

Sara wanted to test how the exposed surface area affects the rate of evaporation. Which two setups should she compare to ensure a fair test?

A Setup A: 50ml water in a tray; Setup B: 100ml water in the same tray
B Setup A: 50ml water in a tall glass; Setup B: 50ml water in a wide tray
C Setup A: 50ml hot water; Setup B: 50ml cold water
D Setup A: 50ml water in the sun; Setup B: 50ml water in the shade
Show Worked Solution

Worked Solution

Step 1: Identify the independent variable (Exposed Surface Area). Step 2: Keep all other variables constant (Volume of water, temperature, presence of wind). Step 3: Comparing a tall glass (small surface) and a wide tray (large surface) with the same volume of water is a fair test.

Correct answer: Setup A: 50ml water in a tall glass; Setup B: 50ml water in a wide tray

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free