1
GATE CSE 2008
MCQ (Single Correct Answer)
+2
-0.6
Which of the following is/are true of the auto-increment addressing mode?
$${\rm I}.\,\,\,$$ It is useful in creating self-relocating code
$${\rm II}.\,\,\,$$ If it is included in an Instruction Set Architecture, then an additional $$ALU$$ is required for effective address calculation.
$${\rm III}.\,\,\,$$ The amount of increment depends on the size of the data item accessed
A
$${\rm I}$$ only
B
$${\rm II}$$ only
C
$${\rm III}$$ only
D
$${\rm II}$$ & $${\rm III}$$ only
2
GATE CSE 2007
MCQ (Single Correct Answer)
+2
-0.6
An operating system uses Shortest Remaining Time first $$(SRT)$$ process scheduling algorithm. Consider the arrival times and execution times for the following processes: GATE CSE 2007 Operating Systems - Process Concepts and Cpu Scheduling Question 20 English

What is the total waiting time for process $$P2?$$

A
$$5$$
B
$$15$$
C
$$40$$
D
$$55$$
3
GATE CSE 2006
MCQ (Single Correct Answer)
+2
-0.6
Consider three processes (process id $$0,1,2,$$ respectively) with compute time bursts $$2, 4,$$ and $$8$$ time units. All processes arrive at time zero. Consider the longest remaining time first $$(LRTF)$$ scheduling algorithm. In $$LRTF$$ ties are broken by giving priority to the process with the lowest process id. The average turn around time is
A
$$13$$ units
B
$$14$$ units
C
$$15$$ units
D
$$16$$ units
4
GATE CSE 2006
MCQ (Single Correct Answer)
+2
-0.6
Consider three processes, all arriving at time zero, with total execution time of $$10,20,$$ and $$30$$ units, respectively. Each process spends the first $$20$$% of execution time doing $${\rm I}/O$$, the next $$70$$% of time doing computation, and the last $$10$$% of time doing $${\rm I}/O$$ again. The operating system uses a shortest remaining compute time first scheduling algorithm and scheduling a new process either when the running processes gets blocked on $${\rm I}/O$$ or when the running process finishes its compute burst. Assume that all $${\rm I}/O$$ operations can be overlapped as much as possible. For what percentage of time does the $$CPU$$ remain idle?
A
$$0$$%
B
$$10.6$$%
C
$$30.0$$%
D
$$89.4$$%
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