Explain multitasking with reference to an operating system.
What will be an ideal response?
Multitasking refers to the ability of an operating system to have more than one program (also called a task) open at one time. Without the ability to multitask, an operating system would require the user to close one program before opening another program. Virtually all operating systems today support multitasking. Although multitasking enables a user to work with multiple programs at one time, a single CPU core cannot execute more than one task at one time (unless Intel's Hyper-Threading Technology or another technology that allows a single core to function as two cores is used). Consequently, the CPU rotates between processing tasks, but it works so quickly that it appears to the user that all programs are executing at the same time.
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If you desire to use an asterisk (*) literally in a regular expression, use:
a) "*" b) "/*" c) "\*" d) "_*"
The formula =D5+D6 changes to _____ if rows 1 and 2 are deleted.
A. =D4+D5 B. =D2+D3 C. =D3+D4 D. The formula does not change
Which database function returns the lowest value from the dataset based on your criteria?
A) DMIN B) DMAX C) DCOUNT D) DLEAST
Which of the following is true about regular expressions?
A. In most cases, regular expression patterns are processed from right to left. B. Matches occur when patterns are found anywhere within a source string. C. By default, matches are case insensitive. D. Every character inside a pattern is taken literally, including metacharacters.