Measurement and Calculation Quiz

A student team designs a biodegradable phone stand. Three different digital balances are available: Balance A: reads to 0.1 g, Balance B: reads to 0.01 g, Balance C: reads to 0.001 g. The mass of the stand is measured as 42.376 g on Balance C. When reporting the mass in a table comparing all prototypes measured on Balance B, which value is most appropriate?

• 42.376 g

• 42.38 g

• 42.4 g

• 42.00 g

A team measures the volume of an irregular seed pod by water displacement. Initial water level: 18.5 mL. Final water level: 26.23 mL. What should be reported as the volume of the seed pod?

• 7.73 mL

• 7.7 mL

• 7.730 mL

• 8 mL

A recycled plastic sample has a mass of 12.48 g and a volume of 4.2 mL. What is the density, reported correctly?

• 2.97 g/mL

• 2.971 g/mL

• 3.0 g/mL

• 2.9 g/mL

Four teams measure the same standard rod known to be 10.00 cm long. Team A: 9.50, 9.52, 9.51 cm. Team B: 10.49, 9.51, 10.48 cm. Team C: 10.01, 10.00, 9.99 cm. Team D: 10.8, 9.1, 10.0 cm. Which team’s results are both accurate and precise?

• Team A

• Team B

• Team C

• Team D

A biodegradable film must be 0.250 mm thick. A student reports the thickness as 2.5 × 10⁻⁴ m. Which statement is correct?

• The value is incorrect

• The value is correct but has too many sig figs

• The value is correct and properly reported

• The value should be written as 0.00025 m

A filtration system processes 3.50 L of water every 45.0 s. What is the flow rate in mL/s, reported correctly?

• 77.8 mL/s

• 77.78 mL/s

• 78 mL/s

• 80 mL/s

A ruler is marked in millimeters. A leaf is measured as 7.35 cm. What is the uncertainty implied by this measurement?

• ±0.01 cm

• ±0.05 cm

• ±0.1 cm

• ±1 cm

Which measurement has three significant figures?

• 0.0300 kg

• 300 mL

• 3.00 × 10² mL

• 0.003 kg

A solar panel prototype has dimensions 12.4 cm × 6.23 cm. What area should be reported?

• 77.252 cm²

• 77.3 cm²

• 77 cm²

• 80 cm²

Two sensors measure temperature change: Sensor X: 24.5°C, Sensor Y: 24.52°C. Which conclusion is best?

• Sensor Y is more accurate

• Sensor Y is more precise

• Sensor X is more precise

• Accuracy cannot be determined