C Programming Questions and Answers

Answer: D

Correct answer: All of above

A disk address must identify the sector uniquely, and that takes all three coordinates: which surface (which platter and which side of it), which track on that surface, and which sector along the track. This is the classic cylinder-head-sector scheme.

Answer: D

Correct answer: All of the above

The ALU’s decision-making reduces to three comparisons: greater than, less than and equal to. Every conditional branch in every program is built from them, and the more elaborate tests are combinations - “not less than” being “greater than or equal to”.

Answer: C

Correct answer: Formatting

Formatting changes how a document looks - fonts, sizes, margins, alignment, spacing - without changing what it says. Editing changes the content itself. The distinction is what makes a style sheet possible: alter the appearance of a whole document without touching a word of it.

Answer: D

Correct answer: All of the above

Direct entry means data enters the machine without being keyed. An optical scanner, a light pen, and a mouse or digitiser all qualify: each converts a physical action or image straight into machine-readable form. A keyboard, by contrast, is a keying device.

Answer: B

Correct answer: Digital plotter

A CAD drawing is made of lines, and a plotter draws them as lines - continuously, at large size and with high precision - rather than approximating them with a grid of dots. That is why plotters remained standard for engineering and architectural output long after dot-matrix and line printers had been displaced elsewhere.

Answer: B

Correct answer: Because they can stop or allow the flow of current

The name comes from the analogy with a plumbing valve: like a tap, the tube lets current flow one way and blocks it the other, and the grid can stop or allow that flow. Amplification is a further consequence - a small change at the grid produces a large change in the current - but it is the controlling of flow that gives the valve its name.

Answer: D

Correct answer: gathering

Gathering data is input - it happens before processing begins. Processing is what the machine then does to the data: arranging, manipulating and calculating.

Answer: B

Correct answer: AT computers

IBM’s PC/AT (Advanced Technology, 1984) was built round the Intel 80286. The earlier PC and PC/XT used the 8088, and the PS/2 line that followed used the 80286 and 80386 in a new architecture with the Micro Channel bus.

Answer: D

Correct answer: Both b and c

The two major kinds of chip are the microprocessor, which does the processing, and the primary memory chip (RAM and ROM), which holds the data and instructions it works on. External or secondary storage - disks - is not a chip in this sense.

Answer: A

Correct answer: Universal Automatic Computer

UNIVAC is the UNIVersal Automatic Computer, built by Eckert and Mauchly and delivered in 1951 - the first commercially produced computer in the United States. It made its name by correctly predicting the 1952 presidential election from a small sample of returns.