Which instrument is suitable to measure the internal diameter of a test tube?
Correct answer: A. Vernier Callipers
- A. Vernier Callipers
- B. Screw Gauge
- C. Bore Gauge
- D. None
Explanation
The inside jaws of vernier callipers are designed to measure internal diameters, so they can measure the inner diameter of a test tube. A screw gauge is mainly used for small external dimensions, while a bore gauge is less commonly intended for this basic measurement. The likely choice is c, because the word bore may suggest any internal diameter, although vernier callipers are the standard school-laboratory instrument here.
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