1
GATE CSE 2005
MCQ (Single Correct Answer)
+1
-0.3
What is the swap space in the disk used for?
A
Saving temporary html pages
B
Saving process data
C
Storing the super-block
D
Storing device drivers
2
GATE CSE 2005
MCQ (Single Correct Answer)
+1
-0.3
Normally user programs are prevented from handling $${\rm I}/O$$ directly by $${\rm I}/O$$ instructions in the for $$CPU$$ having explicit $${\rm I}/O$$ instructions, such $${\rm I}/O$$ protection is ensured by having the $${\rm I}/O$$ instructions privilege in $$CPU$$ with memory mapped $${\rm I}/O$$ there is no explicit $${\rm I}/O$$ instruction. Which one of the following is true for a $$CPU$$ with memory mapped $${\rm I}/O$$?
A
$${\rm I}/O$$ protection ensured by operating system routines(s)
B
$${\rm I}/O$$ protection is ensured by a hardware trap
C
$${\rm I}/O$$ protection is ensured during system configuration
D
$${\rm I}/O$$ protection is not possible.
3
GATE CSE 2005
MCQ (Single Correct Answer)
+2
-0.6
Consider a disk drive with the following specifications:
$$16$$ surfaces, $$512$$ tracks/surface, $$512$$ sectors/track, $$1$$KB/Sector, rotation speed $$3000$$ rpm. The disk is operated in cycle stealing mode whereby whenever one $$4$$ byte word is ready it it's sent to memory; similarly, for writing, the disk interface reads a $$4$$ byte word from the memory in each $$DMA$$ cycle Memory cycle time is $$40$$nsec. The maximum percentage of time that the $$CPU$$ gets blocked during $$DMA$$ operation is:
A
$$10$$
B
$$25$$
C
$$40$$
D
$$50$$
4
GATE CSE 2005
MCQ (Single Correct Answer)
+2
-0.6
Suppose n processes, P1,......., Pn share m identical resource units, which can be reserved and released one at a time. The maximum resource requirement of process Pi is Si, where Si > 0. Which one of the following is a sufficient condition for ensuring that deadlock does not occur?
A
$$\forall i,{s_i} < m$$
B
$$\forall i,{s_i} < n$$
C
$$\sum\limits_{i = 1}^n {{s_i}} < \left( {m + n} \right)$$
D
$$\sum\limits_{i = 1}^n {{s_i}} < \left( {m \times n} \right)$$
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