Questions by Bikram / GATE Overflow for GATE CSE

2 votes

1 answer

801

GATE Overflow | Operating Systems | Test 1 | Question: 30
Match these OS abstractions with Hardware components: A. Thread 1. interrupt B. Virtual address space 2. memory C. File system 3. CPU D. Signal 4. Disk A-2 B-4 C-3 D-1 A-1 B-2 C-3 D-4 A-3 B-2 C-4 D-1 A-4 B-1 C-2 D-3

Match these OS abstractions with Hardware components:A. Thread1. interruptB. Virtual address space2. memoryC. File system3. CPUD. Signal4. DiskA-2 B-4 C-3 D-1A-1 B-2 C-3 ...

343 views

asked Sep 3, 2016

3 votes

1 answer

802

GATE Overflow | Operating Systems | Test 1 | Question: 29
Semaphores are used to solve the problem of resource allocation process synchronization deadlock process communication

Semaphores are used to solve the problem ofresource allocationprocess synchronizationdeadlockprocess communication

386 views

asked Sep 3, 2016

4 votes

1 answer

803

GATE Overflow | Operating Systems | Test 1 | Question: 28
Consider a computer with 64 MB physical memory and 32 bit virtual address space. If the page size is 4KB , then the size of page table in MB is _____________ (Assume 2 bits per page table entry for extra information other than that for addressing)

Consider a computer with 64 MB physical memory and 32 bit virtual address space. If the page size is 4KB , then the size of page table in MB is _____________ (Assume 2...

625 views

asked Sep 3, 2016

2 votes

2 answers

804

GATE Overflow | Operating Systems | Test 1 | Question: 27
Dijkstra's Banker's algorithm in Operating System solves the problem of deadlock avoidance recovery from deadlock mutual exclusion context switching

Dijkstra's Banker's algorithm in Operating System solves the problem ofdeadlock avoidancerecovery from deadlockmutual exclusioncontext switching

425 views

asked Sep 3, 2016

3 votes

1 answer

805

GATE Overflow | Operating Systems | Test 1 | Question: 26
Swap space in the disk is used to _____ save temporary html pages save process data store the super-block store device drivers

Swap space in the disk is used to _____save temporary html pagessave process datastore the super-blockstore device drivers

346 views

asked Sep 3, 2016

2 votes

1 answer

806

GATE Overflow | Operating Systems | Test 1 | Question: 25
There is a 4 way set associative cache memory with 8 cache blocks. The main memory consists of 256 blocks and the request for memory blocks is in that order: $0,255,1,4,3,8,133,159,216,129,63,8,48,32,73,92,155 $ Which one of the following memory block will not be in cache if LRU replacement policy is used? 159 8 129 48

There is a 4 way set associative cache memory with 8 cache blocks. The main memory consists of 256 blocks and the request for memory blocks is in that order:$$0,255,1,4,3...

530 views

asked Sep 3, 2016

5 votes

2 answers

807

GATE Overflow | Operating Systems | Test 1 | Question: 24
A system with a 2-level paging scheme in which a regular memory access takes 150 nanoseconds(ns) and page faults takes 4 miliseconds(ms). An average instruction takes 100 ns of cpu time and two memory accesses. The TLB hit ... every 100,000 instructions. What is the effective average instruction execution time? 446 ns 1230 ns 830 ns 1050 ns

A system with a 2-level paging scheme in which a regular memory access takes 150 nanoseconds(ns) and page faults takes 4 miliseconds(ms). An average instruction takes 100...

1.0k views

asked Sep 3, 2016

1 votes

2 answers

808

GATE Overflow | Operating Systems | Test 1 | Question: 23
Consider an operating system capable of loading and executing a single sequential user process at a time. The disk main scheduling algorithm used is FCFS. If FCFS is replaced by SSTF claimed by the service provider to give 50% ... results, what is the expected improvement in the I/O performance of user programs? 50% 40% 25% no improvement

Consider an operating system capable of loading and executing a single sequential user process at a time. The disk main scheduling algorithm used is FCFS. If FCFS is repl...

651 views

asked Sep 3, 2016

0 votes

2 answers

809

GATE Overflow | Operating Systems | Test 1 | Question: 22
On a virtual memory system with FIFO page replacement policy, for an arbitrary page access pattern, increasing the number of page frames in main memory will always decrease the number of page faults always increase the number of page faults sometimes increase the number of page faults do not affect the number of page faults

On a virtual memory system with FIFO page replacement policy, for an arbitrary page access pattern, increasing the number of page frames in main memory willalways decreas...

334 views

asked Sep 3, 2016

0 votes

3 answers

810

GATE Overflow | Operating Systems | Test 1 | Question: 21
Consider $m$ processes sharing the CPU in a round-robin manner. Assume that each process switch takes $p$ seconds. For which value of quantum size $w$, the overhead resulting from process switch is minimized but at the same time each process is guaranteed to get it's ... $w \leq \frac{n- mp}{m+1}$ $w \leq \frac{n- mp}{m+1}$

Consider $m$ processes sharing the CPU in a round-robin manner. Assume that each process switch takes $p$ seconds. For which value of quantum size $w$, the overhead resul...

552 views

asked Sep 3, 2016

2 votes

1 answer

811

GATE Overflow | Operating Systems | Test 1 | Question: 20
An operating system contains 3 user processes each requiring 2 units of resource R. The minimum number of units of R such that no deadlocks will ever arise is ____ (assume no other resource requirement)

An operating system contains 3 user processes each requiring 2 units of resource R. The minimum number of units of R such that no deadlocks will ever arise is ____ (assum...

283 views

asked Sep 3, 2016

0 votes

2 answers

812

GATE Overflow | Operating Systems | Test 1 | Question: 19
The E_CS() and L_CS() functions to implement critical section of a process are realized using Test-and-Set instruction as stated below: void E_CS(X) { while(Test-and-Set(X); } void L_CS(X) { X=0; } In above code snippet, X is a ... into CS in FIFO order more than 1 process can enter into CS at same time i only i and ii ii and iii iv only

The E_CS() and L_CS() functions to implement critical section of a process are realized using Test-and-Set instruction as stated below:void E_CS(X) { while(Test-and-Set(X...

506 views

asked Sep 3, 2016

2 votes

2 answers

813

GATE Overflow | Operating Systems | Test 1 | Question: 18
System calls are usually invoked by using a software interrupt polling an indirect jump a privileged instruction

System calls are usually invoked by usinga software interruptpollingan indirect jumpa privileged instruction

519 views

asked Sep 3, 2016

0 votes

1 answer

814

GATE Overflow | Operating Systems | Test 1 | Question: 17
Thrashing reduces page I/O decreases the degree of multiprogramming implies excessive page I/O improves system performance

Thrashingreduces page I/Odecreases the degree of multiprogrammingimplies excessive page I/Oimproves system performance

404 views

asked Sep 3, 2016

1 votes

2 answers

815

GATE Overflow | Operating Systems | Test 1 | Question: 16
Determine the number of page faults when references to pages occur in the sequence -$1,2,4,5,2,1,2,4$. Assume that the main memory can accommodate 3 pages and already has pages 1, 2 with page 1 having been brought earlier than page 2 and LRU being the replacement strategy used.

Determine the number of page faults when references to pages occur in the sequence -$1,2,4,5,2,1,2,4$. Assume that the main memory can accommodate 3 pages and already ha...

513 views

asked Sep 3, 2016

1 votes

2 answers

816

GATE Overflow | Operating Systems | Test 1 | Question: 15
At a particular time of computation, the value of a counting semaphore is $7$ , then $20$ $P$ operations and 'x' $V$ operations were completed on this semaphore. If the final value of the semaphore is $5$, the value of $x$ should be ____

At a particular time of computation, the value of a counting semaphore is $7$ , then $20$ $P$ operations and 'x' $V$ operations were completed on this semaphore. If the f...

308 views

asked Sep 3, 2016

1 votes

1 answer

817

GATE Overflow | Operating Systems | Test 1 | Question: 14
Dirty bit is used to show the page with corrupted data wrong page in the memory page that is modified after being loaded into cache memory page that is less frequently accessed

Dirty bit is used to show thepage with corrupted datawrong page in the memorypage that is modified after being loaded into cache memorypage that is less frequently access...

230 views

asked Sep 3, 2016

2 votes

3 answers

818

GATE Overflow | Operating Systems | Test 1 | Question: 13
In a paged memory, the page hit ratio is 0.35. The time required to access a page in secondary memory is 100 ns. The time required to access a page in primary memory is 10 ns. The average time required to access a page is 100 ns 68.0 ns 68.5 ns 78.5 ns

In a paged memory, the page hit ratio is 0.35. The time required to access a page in secondary memory is 100 ns. The time required to access a page in primary memory is 1...

869 views

asked Sep 3, 2016

2 votes

2 answers

819

GATE Overflow | Operating Systems | Test 1 | Question: 12
In a multi-user operating system, 20 requests are made to use a particular resource per hour, on average. The probability that no requests are made in 45 minutes is - $e^-{15}$ $e^{-5}$ $1 - e^{-5}$ $1-e^{-10}$

In a multi-user operating system, 20 requests are made to use a particular resource per hour, on average. The probability that no requests are made in 45 minutes is -$e^-...

784 views

asked Sep 3, 2016

2 votes

1 answer

820

GATE Overflow | Operating Systems | Test 1 | Question: 11
Aging is keeping track of the cache contents keeping track of what pages are currently residing in the memory keeping track of how many times a given page is referenced increasing the priority of jobs to ensure termination in a finite time

Aging iskeeping track of the cache contentskeeping track of what pages are currently residing in the memorykeeping track of how many times a given page is referencedincre...

456 views

asked Sep 3, 2016

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