A voltage of resistance 500ohms calibrated read 1ohm per division. If the instrument is required to read 10ohm per scale division, what series resistance must be connected to it

Answer 1

you want to reduce current in the meter by a factor of ten, so series impedance needs to be increased by a factor of ten. Honestly, your first sentence is just a tad confusing to me. Normally, one would claibrate a meter to read current per division.