Computer Languages Questions and Answers

Answer: D

Correct answer: all of the above

A routine may be a piece of a larger program, a set of instructions repeated for convenience, or a short program complete in itself. What defines it is that it is self-contained and can be called, not how big it is.

Answer: A

Correct answer: subscript

A subscript is the index that picks out one element of an array: A(5) in one dimension, A(5,3) in two. The number of subscripts is the number of dimensions.

Answer: C

Correct answer: reserved words

Words the language keeps for its own purposes - IF, THEN, FOR, PRINT - are reserved and may not be reused as names. It is because they carry a fixed meaning that they cannot be redefined.

Answer: A

Correct answer: Rise time

Rise time is defined as the interval in which a pulse climbs from 10 per cent to 90 per cent of its final value; the 10 and 90 per cent marks are used because the very beginning and end of the transition are hard to identify. Decay time is the corresponding measure for the fall.

Answer: B

Correct answer: 1-persistent then the channel is continually sensed

Under 1-persistent CSMA a station that finds the channel busy keeps listening and transmits the instant it goes idle, with probability 1. Non-persistent CSMA waits a random time before sensing again, and p-persistent transmits with probability p once the channel clears.

Answer: C

Correct answer: ENIAC

ENIAC, completed in 1946, is generally counted the first general-purpose electronic computer. EDVAC and UNIVAC both came after it, and both were designed by the same team.

Answer: B

Correct answer: 72

Octal digits correspond to groups of three binary digits, so split the number from the right:

\[ 111\,010_2 \;\rightarrow\; 111=7,\quad 010=2 \;\rightarrow\; 72_8 \]

Answer: D

Correct answer: All of the above

Primary storage is the memory the processor addresses directly - RAM and ROM. Magnetic tape, magnetic disk and optical disk are all secondary storage: they hold data outside the processor's address space and must be read into memory before use. So none of the three is primary, and the answer covers all of them.

Answer: D

Correct answer: All of the above

All three names describe high level languages from different angles: they are problem oriented rather than machine oriented, and particular ones are aimed at business or at mathematical work. The common feature is that the programmer writes in the terms of the problem.

Answer: C

Correct answer: Both of the above

Machine language and assembly language are the two low level languages: both work in the processor's own instruction set, one in binary and the other in mnemonics that map to it one for one.