Input and Output Questions and Answers

Answer: C

Correct answer: Video Card, Resolution, and Refresh Rate

These three between them determine what the user sees. The video card generates the signal and bounds what the monitor can be driven to display; resolution sets the number of pixels and hence the detail; refresh rate sets how often the image is redrawn and therefore the smoothness of motion.

Size affects how large the image appears but not its quality - a large screen at low resolution simply shows the same detail bigger, with coarser pixels, which is why the options including size are the weaker set.

Answer: B

Correct answer: Keyboard

The keyboard is the input device present on virtually every computer and used for nearly all text and command entry. A mouse is almost as common but points rather than enters data; a modem is a communication device and a monitor is an output device.

Answer: A

Correct answer: I/O

Input and output devices are the interface between the machine and everything outside it - users, other machines, and the physical world.

Without them a computer could compute but neither receive a problem nor report an answer. They are also called peripherals, because they surround the processor and memory rather than forming part of them. Storage devices are a special case, communicating with the machine's own long-term memory rather than with the world.

Answer: A

Correct answer: 101 to 105 keys

The 101-key layout became the standard with the IBM Enhanced Keyboard, and the 104- and 105-key variants added the two Windows keys and a menu key - 104 for the United States layout and 105 where an extra key is needed for the local alphabet.

The letters and numbers are only part of it: the count includes function keys, the numeric keypad, cursor and editing keys and the modifiers, which is why the third option is far too narrow.

Answer: C

Correct answer: Stick

A digitizer has three parts: the tablet, which is the flat sensing surface, and one of two pointing devices used on it - a stylus resembling a pen, or a cursor, a puck with cross-hairs for tracing precisely along a line.

"Stick" names no component of such a device; a joystick is a quite different instrument reporting deflection rather than absolute position. The digitizer's distinguishing property is that it reports where on the tablet the pointer is, which is what makes tracing a drawing possible.

Answer: D

Correct answer: Instructions

A program is a sequence of instructions expressing an algorithm in a form a machine can execute.

Each instruction directs one step, and the sequence is what turns the steps into a procedure. Functions are groupings of instructions rather than the elements themselves, and lines are a matter of how the text is laid out - a single line may hold several instructions or none. It is the instruction that is the unit of meaning.

Answer: B

Correct answer: Keyboard

Alphanumeric means letters and digits, and the keyboard remains the standard device for entering them - a key per character, with modifiers extending the set.

The mouse is a pointing device and enters position rather than characters. A monitor is an output device, and a hard disk is storage. Speech recognition and handwriting input exist as alternatives, but neither has displaced the keyboard for text entry.

Answer: B

Correct answer: Multifunction Device

A multifunction device combines printing, scanning, copying and often faxing in one unit, sharing the paper path, the scanning bar and the print engine between the functions.

Copying is the clearest illustration of the sharing: it is simply a scan followed immediately by a print, requiring no new hardware once both are present. The economy of shared components is why such devices largely replaced separate machines in offices, and they are commonly called all-in-one devices.

Answer: A

Correct answer: Digitizer

A digitizer is used to trace an existing drawing or map: the operator follows the lines with a stylus or cursor and the tablet reports each position, so the result is a set of coordinates - vector data.

A scanner produces an image instead, a grid of pixels with no knowledge of what the lines are. That difference is the point: coordinates can be scaled, edited and measured, which is what mapping and computer-aided design need, whereas an image must first be traced or vectorised.

Answer: B

Correct answer: no

~0 inverts every bit of zero, giving all ones - which as a signed int is \( -1 \), not 1.

So the test is -1 == 1, which is false, and the else branch prints no. The identity worth remembering is \( \mathtt{\sim}x = -x-1 \), which gives \( \mathtt{\sim}0 = -1 \) immediately. The confusion is with the logical !, where !0 genuinely is 1 - one character apart and opposite in result.