1
GATE CSE 2001
MCQ (Single Correct Answer)
+1
-0.3
A CPU has two modes-privileged and non-privileged. In order to change the mode from privileged to non-privileged
A
A hardware interrupt is needed
B
A software interrupt is needed
C
A privileged instruction (which does not generate an interrupt) is needed.
D
A non-privileged instruction (which does not generate an interrupt) is needed.
2
GATE CSE 1999
MCQ (Single Correct Answer)
+1
-0.3
System calls are usually invoked by using:
A
A software interrupt
B
Polling
C
An indirect jump
D
A privileged instruction
3
GATE CSE 1998
MCQ (Single Correct Answer)
+1
-0.3
Which of the following is an example of spooled device?
A
The terminal used to enter the input data for the C program being executed.
B
An output device used to print the output of a number of jobs.
C
The secondary memory device in a virtual storage system.
D
The swapping area on a disk used by the swapper.
4
GATE CSE 1998
MCQ (Single Correct Answer)
+1
-0.3
Consider $$n$$ processes sharing the $$CPU$$ in a round-robin fashion. Assuming that each process switch takes $$s$$ seconds, what must be the quantum size $$q$$ such that the overhead resulting from process switching is minimized but, at the same time each process is guaranteed to get its turn at the $$CPU$$ at least every $$t$$ seconds?
A
$$q \le {{t - ns} \over {n - 1}}$$
B
$$q \ge {{t - ns} \over {n - 1}}$$
C
$$q \le {{t - ns} \over {n + 1}}$$
D
$$q \ge {{t - ns} \over {n + 1}}$$
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