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350. Job Control Language (JCL) statements are used to

Read the input from the slow-speed card reader to the high-speed magnetic disk
Specify, to the operating system, the beginning and end of a job in a batch
Allocate the CPU to a job
All of the above
✅ The correct answer is option B.

357. Swapping

works best with many small partitions
allows many programs to use memory simultaneously
allows each program in turn to use the memory
does not work with overlaying
✅ The correct answer is option C.

323. Trojan-Horse programs

are legitimate programs that allow unauthorized access
do not usually work
are hidden programs that do not show up on the system
usually are immediately discovered
✅ The correct answer is option A.

330. Which of the following is true for machine language.

Repeated execution of program segments
Depicting flow of data in a system
A sequence of instructions which, when followed properly, solves a problem
the language which communicates with the computer using only the binary digits 1 and 0.
✅ The correct answer is option D.
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