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A student measured the length of a rod a...

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

1. A meter scale

2.A vernier calliper where `10` division in vernier scale matches with `9` divisions on the main scale and main scale has `10` divisions in `1cm` .

3.A screw gauge having `100` divisions on the circular scale and a pitch as `1mm` .

4.A screw gauge having `50` divisions on the circular scale and pitch as `1mm`.

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