Which gives more accurate result,ruler or vernier caliper?
Vernier caliper will be more precise than a ruler. It is easier to read very small increments on a vernier. However, which is more accurate depends on the quality of construction. In a well-made ruler you may be able to read a length of 1.6 cm and you can be sure that is the length (.± 0.05 cm) A poorly-made caliber may read 1.545 cm; more precise, but wrong!