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A student measured the length of a rod and wrote its as 3.50 cm. Which instrument did he use to measure it ?

1. A vernier calliper where the 10 divisions in vernier scale matches with 9 division in main scale and main scale has 10 divisions in 1 cm
2. A screw gauge having 100 divisions in the circular scale and pitch as 1 mm
3. A screw gauge having 50 divisions in the circular scale and pitch as 1 mm
4. A meter scale

Correct answer: A vernier calliper where the 10 divisions in vernier scale matches with 9 division in main scale and main scale has 10 divisions in 1 cm

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