Which of the following decimal numbers is equivalent to the binary number 10001011?

Which of the following features are available in word processing software?
A – Spell Checker and Thesaurus     B – Page Orientation      C – Mail merge

What is the utility tool in an operating system that can be used to optimize the performance of a disk by changing non-contiguous files to contiguous files?

Which of the following is the correct form of a URL?