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. (2) MS-DOS stands for Microsoft Disk Operating System. It is a discontinued operating system for x86-
based personal computers mostly developed by Microsoft. It was the main operating system for IBM PC
compatible personal computers during the 1980s and
1990s

. (2) Dynamic Random Access Memory (DRAM), the
most common kind of Random Access Memory (RAM)
for Personal computers and workstations, has to be
refreshed many times per second in order to hold its
data contents. DRAM is dynamic in that, unlike static RAM (SRAM), it needs to have its storage cells refreshed or given a new electronic charge every few
milliseconds. DRAM stores each bit in a storage cell
consisting of a capacitor and a transistor. Capacitors
tend to lose their charge rather quickly thus, the need
for recharging.

. (1) URL is an acronym for Uniform Resource Locator.
Commonly referred to as a web address, URL is a
reference to a web resource that specifies its location
on a computer network and a mechanism for retrieving it.

(2) As per the latest data of International Telecommunications Union, China had the largest number of internet users in the world (721,434,547) as of 30 June,
2016. India comes second with 462,124,989 internet users.

(3) The question has more than one option correct:
secondary storage is also known as auxiliary storage
or external storage.
USB (memory stick) Flash Drive is a secondary data
storage device that includes flash memory with an
integrated USB interface. USB flash drives are typically removable and rewritable, and physically much
smaller than an optical disc. They are often used for
the same purposes, for which floppy disks or CDs
were used, i.e., for storage, data back-up and transfer of computer files.