Computer & IT

note!Answer: B) An OR followed by a NOT
NOR is the negation of OR, so it is an OR followed by a NOT.

note!Answer: D) 100.101
4 is 100 in binary, and 5/8 is 0.101 (1/2 + 1/8), so the result is 100.101.

note!Answer: C) 00000101
A positive number in two's complement has the same form as in plain binary, so 5 is 00000101.

note!Answer: B) 0100 + 0100
In 4-bit two's complement, 4 + 4 = 8 exceeds the maximum of 7, giving 1000 (-8), which is an overflow. The other sums stay within range.

note!Answer: A) 00000010
In 8-bit two's complement, 00000010 is +2, which is larger than +1, -1 and -2.

note!Answer: C) A6
A6 is 1010 0110 in binary, and its leading bit is 1, so it is negative. The other values have leading bit 0.

note!Answer: C) Secondary storage contains data for immediate processing
Secondary storage holds data for long-term storage, not immediate processing. Primary storage (RAM) is used for immediate processing.

note!Answer: D) all of these
A computer can output graphics, voice, and text through appropriate output devices.

note!Answer: C) produces hardcopy or softcopy
Output devices are classified as hardcopy (printed on paper) or softcopy (displayed on screen).

note!Answer: B) daisy wheel
Daisy wheel printers can only print fixed characters, so they cannot print graphics.

note!Answer: A) Niklaus Wirth
Niklaus Wirth designed the Pascal programming language in the late 1960s. Blaise Pascal was a mathematician after whom it was named.

note!Answer: C) hard disc
Hard disks offer direct access and high speed, far faster than sequential magnetic tape or floppy disks.

note!Answer: D) nibble
A group of 4 bits is called a nibble, which is half of a byte.

note!Answer: D) pen plotter
A pen plotter draws images with ink pens to produce high-resolution hard copies.

note!Answer: D) LCD clocks
RAM, microprocessor, and ROM chips are core parts of a PC motherboard, while LCD clocks are not.

note!Answer: C) host computer
A host computer is the central controlling computer that manages the network's terminals and distributed processors.

note!Answer: C) 8 bits
One byte consists of 8 bits.

note!Answer: B) bit
A bit (binary digit) is the smallest unit of data and can hold the value 0 or 1.

note!Answer: D) laser printer
Laser printers produce the sharpest, highest-quality output among these printer types. Dot matrix and line printers are impact printers with lower print quality.

note!Answer: B) second generation
Transistors replaced vacuum tubes in the second generation of computers (about 1956–1963).