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Question 6Asked in UGC NET Computer Science, December 2015 (Paper II & III, Selected Questions)

System calls are usually invoked by using :

  1. AA privileged instruction
  2. BAn indirect jump
  3. CA software interrupt
  4. DPolling
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Correct answer: (C) A software interrupt

Explanation

System calls are invoked from user mode by a software interrupt (trap). A privileged instruction cannot be the answer because privileged instructions cannot be executed in user mode.

From UGC NET Computer Science PYQ, December 2015 (Paper II & III, Selected Questions)

This is question 6 of UGC NET Computer Science PYQ, December 2015 (Paper II & III, Selected Questions). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.