The device that can both feed data into and accept data from a computer is
Answer: C
Correct answer: Input-Output device
A device that both feeds data in and accepts data out is an input–output device - a disk drive, a modem, a touch screen or a network card, each of which carries traffic in both directions. The ALU and the CPU process data rather than exchange it with the outside world.
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The brain of any computer system is
Answer: C
Correct answer: CPU
The central processing unit fetches each instruction, decodes it, performs the arithmetic and logic, and directs every other unit - so it is the part that does the thinking, and is called the brain of the machine. The ALU and the control unit are components within the CPU, and memory only holds what the CPU works on.
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Which of following alphabet can not be part of a hexadecimal digit ?
Answer: B
Correct answer: L
Hexadecimal is base 16, so it needs sixteen digits: 0 to 9 for the first ten values and then A, B, C, D, E and F for ten to fifteen. The letters stop at F, so L can never appear in a hexadecimal number.
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What is the number of bit patterns provided by a 7 bit code?
Answer: B
Correct answer: 128
Each bit is independently 0 or 1, so \( n \) bits give \( 2^n \) distinct patterns. With \( n = 7 \), \[ 2^7 = 128 \] patterns are available - which is exactly why 7-bit ASCII defines 128 characters. \( 2^6 = 64 \), \( 2^8 = 256 \) and \( 2^9 = 512 \) correspond to 6, 8 and 9 bits.
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Graphic interfaces were first used in a xerox product is called?
Answer: D
Correct answer: Small talk
Smalltalk, developed at Xerox PARC in the 1970s, was the first system built around a graphical user interface - overlapping windows, icons, pop-up menus and a mouse - and it ran on the Xerox Alto. The ideas it introduced were later taken up by the Apple Lisa and Macintosh. Ethernet, also from PARC, is a networking technology rather than an interface.
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Find the odd man out.
Answer: B
Correct answer: Microwaves
Coaxial cable, twisted pair and optical fibre are all guided media - the signal travels inside a physical conductor or fibre laid between the two ends. Microwaves travel through open space between antennas, so they are the unguided, wireless medium in the list.
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Find the odd one out?
Answer: B
Correct answer: Printer
A touch screen, a mouse and a keyboard all carry information into the computer, so they are input devices. A printer takes results out of the machine and puts them on paper, which makes it the output device in the list.
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A prescribed set of well-defined instructions for solving mathematical problems is called _______
Answer: D
Correct answer: an algorithm
An algorithm is a finite, ordered set of unambiguous steps that solves a problem or computes a result, each step being effective and the whole terminating. It is written before any code and can be expressed in words or a flowchart; a compiler is the program that translates the code that later implements it.
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Which is a single integrated circuit?
Answer: A
Correct answer: Chip
A chip is a single integrated circuit - one piece of silicon carrying a complete circuit of transistors, sealed in a package. A gate is one logic element within such a circuit, while a CPU may span several chips and a motherboard is a board carrying many of them.
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Which was the first computer which was introduced in Nepal?
Answer: B
Correct answer: IBM 1401
Nepal’s first computer was an IBM 1401, brought in by the Central Bureau of Statistics in 1971 to process the national census. The 1401 was IBM’s widely sold transistorised business machine of the early 1960s.
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