Errors, uncertainties and error bars Quiz
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5 questions, one answer each
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1. A balance reads 0.3 g when nothing is on it. What type of error is this?
- A. Random error
- B. Systematic error
- C. Anomalous result
- D. Resolution error
2. A length is measured as 45.0 ± 0.5 cm. What is the percentage uncertainty?
- A. 1.1%
- B. 0.9%
- C. 11%
- D. 0.011%
3. a = 4.0 ± 0.2 cm and b = 6.0 ± 0.3 cm. What is a + b?
- A. 10.0 ± 0.1 cm
- B. 10.0 ± 0.25 cm
- C. 10.0 ± 0.5 cm
- D. 10.0 ± 0.06 cm
4. The radius of a circle has a percentage uncertainty of 3%. What is the percentage uncertainty in the area πr²?
- A. 3%
- B. 9%
- C. 1.5%
- D. 6%
5. Five readings of a mass all lie within 0.01 g of each other but are all 0.50 g below the true value. How are they best described?
- A. Accurate and precise
- B. Precise but not accurate
- C. Accurate but not precise
- D. Neither accurate nor precise