Computer Awareness Previous Year Questions (PYQ) with Answers – Page 2

Division is an arithmetic operator that works on numbers, while logical operators work on true and false values. Logical (Boolean) operators take one or more conditions that are either true (1) or false (0) and return a true or false result.

A software port is a logical number, not a physical socket, so it is used for network connections and for telling services apart.

In the binary system every step up the ladder of memory units is a factor of 2 raised to 10, that is 1024, so one gigabyte holds 1024 megabytes.

Cache memory is small and very fast, but it is the most expensive memory per byte after the CPU registers, so statement 2 is wrong.

A bus is the shared set of electrical lines on the motherboard that carries data, addresses and control signals between the CPU, memory and input-output devices.

NLP is the branch of artificial intelligence that lets computers understand, interpret and produce human language. Artificial intelligence covers systems that perform tasks normally needing human intelligence, such as learning, reasoning and understanding speech or text.

Released by IBM in 1957, Fortran is the oldest of the four and is often called the first widely used high-level programming language.

Unshielded twisted pair cable has no metal foil or braid around its pairs, so it resists electromagnetic interference less well than shielded twisted pair, not better; the only protection it has is the twisting of each pair, which cancels much of the noise picked up by the two wires.

A 301 reply means Moved Permanently: the page now lives at a new address and the browser or search engine should use that address from now on.

The plain remove-directory command is built to delete an empty folder only. In Windows it is rmdir, also written rd, and in Linux it is rmdir; both stop with a message such as "The directory is not empty" when anything is still inside.

An operating system is the system software that loads when a laptop starts and then runs the machine: it shares out memory, decides which program gets the processor and for how long, keeps files and folders in order on the disk, talks to the keyboard, screen and printer through device…

The 2's complement of a binary number is found in two steps: flip every bit to get the 1's complement, then add 1.

A firewall stands between a trusted private network and an untrusted one such as the internet, and checks the data going in and out.

Static RAM stores each bit in a flip-flop circuit made of several transistors, usually six, so the bit stays put as long as the power is on and never needs refreshing.

A hard disk is a secondary storage device that keeps programs and files permanently, even when the power is off, and it sits outside the processor.

In Microsoft PowerPoint, pressing F5 starts the slide show from the first slide, whichever slide you are working on at that moment.

Of the sectors listed, only Power and Energy and Banking and Financial Services are among the critical sectors named by NCIIPC.

A qubit, short for quantum bit, is the basic unit of information in a quantum computer, just as the bit is in an ordinary computer.

The defining feature of symmetric encryption is that a single shared secret key performs both operations: the sender encrypts the plaintext with it and the receiver decrypts the ciphertext with the very same key.

Symmetric encryption uses one shared secret key for both locking and unlocking data, and because it is the older and simpler of the two families it is variously called conventional, secret key or private key encryption.