Computer & IT

note!Answer: A) Douglas Engelbart
Douglas Engelbart invented the first computer mouse in 1964 at SRI, with William English building it.

note!Answer: D) Connectivity
Connectivity refers to linking separate computer systems so they can communicate and share data.

note!Answer: B) bus
A bus is a shared set of wires that connects several devices and carries data between them.

note!Answer: B) off-line device
An off-line device works without direct communication with the CPU, so it is not under its direct control.

note!Answer: B) teletype terminal
A teletype terminal has a keyboard for input and a printer for output, so it serves both purposes.

note!Answer: B) direct-access storage medium
Magnetic tape is a sequential-access medium, not a direct-access one. Its advantages are low cost, compactness, and reliability.

note!Answer: B) It provides only sequential access to stored data
Magnetic disks provide direct (random) access to data, not only sequential access. Option b is therefore the false statement.

note!Answer: C) multiplexer
A multiplexer combines several signals over one channel, linking the CPU and peripherals.

note!Answer: B) nano sec
Third generation computers (IC-based) operated at nanosecond speeds.

note!Answer: C) daisy chain
A daisy chain connects several devices in series to a single controller.

note!Answer: B) Scratchpad
Scratchpad memory is a small area used for temporary storage of data.

note!Answer: B) MB
MB (megabyte) equals one million bytes, while KB is about a thousand bytes.

note!Answer: D) all of these
Coaxial cable, fiber optic cable and microwave circuits all carry high-bandwidth broadband signals.

note!Answer: B) interface card
Each computer connects to a LAN through a network interface card (NIC).

note!Answer: B) Local Area Network (LAN)
A LAN connects computers over a small area such as a building, without telephone lines.

note!Answer: B) WAN
A Wide Area Network (WAN) covers regional, national or global distances.