MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
A slide calipers has 10 divisions on its vernier scale. If the smallest main-scale division is 1 mm, what is the vernier constant?
Think it through first, then pick an option.
- a 0.1 cm
- b 0.01 cm
- c 1 mm
- d 10 cm
Answer and explanation
Correct answer: b 0.01 cm
Vernier constant = 1 mm ÷ 10 = 0.1 mm = 0.01 cm.
Why the other options are wrong
- a 0.1 cm: 0.1 cm = 1 mm, which is the smallest main-scale division itself; the vernier constant is one tenth of it.
- c 1 mm: 1 mm is the smallest main-scale division; to get the vernier constant it must be divided by the 10 divisions.
- d 10 cm: 10 cm is impossibly large for a vernier constant; the constant is smaller than 1 mm.
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