लाइ फ्युजका
4
Why MCB is called the developed form of fuse? Give the reason​

Miniature circuit breakers is called the developed form of fuse because MCBs are more sensitive to current than fuses. They immediately detect any abnormality and switch off the electrical circuit automatically. This prevents any permanent damage to electrical appliances and human beings

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it