Read the following graduated cylinder.

Question

BlackTom AI · Accepted Answer

Bottom of the meniscus should be read at eye level, so use that value and include one estimated digit beyond the smallest tick: the correct report is 26.0 mL.

1) Relevant knowledge points and concepts
- Liquids in graduated cylinders form a meniscus; you read the bottom of the meniscus at eye level to avoid parallax error. 
- The measurement is reported with an uncertain final digit: you read to the smallest marked division and estimate one additional digit. 
- Significant-figure conventions: writing an estimated digit shows the precision (e.g., 26.0 mL indicates an estimated tenth of a milliliter).

2) Step-by-step reasoning process
- Determine the scale: the large labeled marks show 10, 20, 30 mL. Between 20 and 30 there are 10 equal minor divisions, so each minor division = (30 − 20) / 10 = 1.0 mL. 
- Count from the 20 mL mark up to the meniscus: the meniscus lies six minor divisions above 20 mL. That gives a direct reading of 20 + 6 × 1.0 = 26 mL. 
- Because the smallest division is 1.0 mL, estimate one digit beyond that (the tenths place) to express the uncertainty: estimate the meniscus to the nearest 0.1 mL → 26.0 mL.

3) Calculations and intermediate steps
- Minor division size = (30 mL − 20 mL) / 10 divisions = 1.0 mL per division.
- Number of divisions above 20 mL = 6.
- Raw reading = 20 mL + (6 × 1.0 mL) = 26 mL.
- Include one estimated digit: 26.0 mL (±0.1 mL).

4) Why the correct answer is correct
- The meniscus sits at the sixth 1-mL tick above 20 mL, giving 26 mL. Including one estimated decimal place (because you estimate between 1-mL ticks) yields 26.0 mL, which correctly communicates the measured value and its precision.

5) Why the other options are incorrect
- 26.00 mL implies two estimated decimal places (precision to 0.01 mL), which is not justified by 1-mL scale divisions. 
- 26 mL omits the estimated digit and therefore understates the reported precision customary for such readings. 
- "None of these responses apply" is wrong because a correct, justifiable reading is available.

6) Conclusion
The measured volume, read at the bottom of the meniscus with one estimated digit, is 26.0 mL, which matches the provided correct answer.

Read the following graduated cylinder.单项选择题

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