accuracy #!#precision#!#significant figures

Define significant figures.

The significant figures in 3400 are

In the context of accuracy of measurement and significant figures in expressing result of experiment, which of the following is /are correct (1) Out of the two measurements 50.14 cm and 0.00025 ampere, the first one has greater accuracy (2) If one travels 478 km by rail and 397 m by road,, the total distance travelled is 478 km