Questions

Personal flotation devices (PFDs), have life span upto it is damaged. Hence, When it has a torn strap you should discard a PFD.

Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.

Ominous is the correctly spelt word in the given options. It means that giving the worrying impression that something bad is going to happen.

Autocorrect was originally designed to replace Misspelled words. Its purpose is as part of the spell checker to correct common spelling or typing errors, saving time for the user. It is commonly found in word processors and text editing interfaces for smartphones, computers, etc.