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Recent activity by Milicevic3306
3
answers
1
GATE CSE 2014 Set 1 | Question: 20
Which one of the following is FALSE? User level threads are not scheduled by the kernel. When a user level thread is blocked, all other threads of its process are blocked. Context switching between user level threads is faster than context switching between kernel level threads. Kernel level threads cannot share the code segment.
answer edited
in
Operating System
Jun 29, 2018
24.2k
views
gatecse-2014-set1
operating-system
threads
normal
2
answers
2
CMI2012-A-10
Consider the following functions $f$ and $g$. f(){ x = x-50; y = y+50; } g( ) { a = a+x; a = a+y; } Suppose we start with initial values of $100$ for $x, 200$ for $y$, and $0$ for $a$, and then execute $f$ and $g$ in parallel - that ... either execute one statement from $f$ or one statement from $g$. Which of the following is not a possible final value of $a$? $300$ $250$ $350$ $200$
answer edited
in
Operating System
Jun 29, 2018
1.3k
views
cmi2012
operating-system
process-synchronization
1
answer
3
GATE CSE 1990 | Question: 1-vi
The highest-response ratio next scheduling policy favours ___________ jobs, but it also limits the waiting time of _________ jobs.
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in
Operating System
Jun 29, 2018
5.6k
views
gate1990
operating-system
process-scheduling
fill-in-the-blanks
5
answers
4
GATE CSE 2017 Set 1 | Question: 40
Recall that Belady's anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements: $S_1$ ... $S_2$ is false $S_1$ is false, $S_2$ is true $S_1$ is false, $S_2$ is false
answer edited
in
Operating System
Jun 29, 2018
15.0k
views
gatecse-2017-set1
page-replacement
operating-system
normal
7
answers
5
GATE CSE 2005 | Question: 19
Which one of the following is true for a CPU having a single interrupt request line and a single interrupt grant line? Neither vectored interrupt nor multiple interrupting devices are possible Vectored interrupts are not possible ... and multiple interrupting devices are both possible Vectored interrupts are possible but multiple interrupting devices are not possible
answer edited
in
Operating System
Jun 29, 2018
20.8k
views
gatecse-2005
operating-system
io-handling
normal
4
answers
6
GATE CSE 2005 | Question: 20
Normally user programs are prevented from handling I/O directly by I/O instructions in them. For CPUs having explicit I/O instructions, such I/O protection is ensured by having the I/O instruction privileged. In a CPU with memory mapped I/ ... /O protection is ensured by a hardware trap I/O protection is ensured during system configuration I/O protection is not possible
answer edited
in
Operating System
Jun 29, 2018
11.3k
views
gatecse-2005
operating-system
io-handling
normal
3
answers
7
GATE CSE 2008 | Question: 66
A process executes the following code for(i=0; i<n; i++) fork(); The total number of child processes created is $n$ $2^n-1$ $2^n$ $2^{n+1} - 1$
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in
Operating System
Jun 29, 2018
16.8k
views
gatecse-2008
operating-system
fork-system-call
normal
4
answers
8
GATE CSE 2015 Set 2 | Question: 49
Consider a typical disk that rotates at $15000$ rotations per minute (RPM) and has a transfer rate of $50 \times 10^6$ ... the disk transfer time, the average time (in milliseconds) to read or write a $512$-byte sector of the disk is _____
answer edited
in
Operating System
Jun 29, 2018
17.5k
views
gatecse-2015-set2
operating-system
disk
normal
numerical-answers
4
answers
9
GATE CSE 2008 | Question: 32
For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional to the seek distance due to non-uniform distribution of requests arm starting and stopping inertia higher capacity of tracks on the periphery of the platter use of unfair arm scheduling policies
answer edited
in
Operating System
Jun 29, 2018
13.2k
views
gatecse-2008
operating-system
disk
normal
5
answers
10
GATE CSE 2004 | Question: 17
A Boolean function $x’y’ + xy + x’y$ is equivalent to $x' + y'$ $x + y$ $x + y'$ $x' + y$
answer edited
in
Digital Logic
Jun 29, 2018
7.7k
views
gatecse-2004
digital-logic
easy
boolean-algebra
5
answers
11
GATE CSE 2017 Set 1 | Question: 41
Consider a database that has the relation schemas EMP(EmpId, EmpName, DeptId), and DEPT(DeptName, DeptId). Note that the DeptId can be permitted to be NULL in the relation EMP. Consider the following queries on the database expressed in tuple relational calculus. { ... Which of the above queries are safe? I and II only I and III only II and III only I, II and III
answer edited
in
Databases
Jun 29, 2018
24.7k
views
gatecse-2017-set1
databases
relational-calculus
safe-query
normal
5
answers
12
GATE IT 2008 | Question: 75
Consider the following relational schema: $\text{Student} (\underline{\text{school-id}, \text{sch-roll-no}}, \text{sname}, \text{saddress})$ ... schools with a pass percentage above $35\%$ over all exams taken together schools with a pass percentage above $35\%$ over each exam
answer edited
in
Databases
Jun 29, 2018
14.3k
views
gateit-2008
databases
relational-calculus
normal
1
answer
13
GATE CSE 2004 | Question: 13
Let $R_1 \left(\underline{A}, B, C\right)$ and $R_2\left(\underline{D}, E \right) $ be two relation schema, where the primary keys are shown underlined, and let C be a foreign key in $R_1$ referring to $R_2$. Suppose there is no violation of the above ... $\Pi_D \left(r_1 \bowtie_{C \neq D}r_2\right)$ $\Pi_C \left(r_1 \bowtie_{C = D}r_2\right)$
answer edited
in
Databases
Jun 29, 2018
7.0k
views
gatecse-2004
databases
relational-calculus
easy
4
answers
14
ISI2011-PCB-CS-5b
Suppose we have a relation $R(A, B, C, D, E)$ with the functional dependencies: $A \rightarrow D, B \rightarrow C, D \rightarrow E, CE \rightarrow B$. If we project $R$ and therefore its functional dependencies onto the schema $ABC$, what will the key(s) for $ABC$ be?
answer edited
in
Databases
Jun 29, 2018
2.0k
views
descriptive
isi2011-pcb-cs
databases
database-normalization
5
answers
15
GATE CSE 2005 | Question: 23
Packets of the same session may be routed through different paths in: TCP, but not UDP TCP and UDP UDP, but not TCP Neither TCP nor UDP
answer edited
in
Computer Networks
Jun 29, 2018
19.4k
views
gatecse-2005
computer-networks
tcp
udp
easy
3
answers
16
GATE CSE 2015 Set 1 | Question: 21
Suppose that everyone in a group on $N$ people wants to communicate secretly with the $(\text{N - 1})$ others using symmetric Key cryptographic system. The communication between any two person should not be decodable by the others in the group. The numbers of keys required ... satisfy the confidentiality requirement is $2N$ $N(N-1)$ $\dfrac{N(N-1)}{2}$ $(N-1)^{2}$
answer edited
in
Computer Networks
Jun 29, 2018
7.6k
views
gatecse-2015-set1
computer-networks
network-security
normal
out-of-gate-syllabus
6
answers
17
GATE CSE 1996 | Question: 2.25
A micro program control unit is required to generate a total of $25$ control signals. Assume that during any micro instruction, at most two control signals are active. Minimum number of bits required in the control word to generate the required control signals will be: $2$ $2.5$ $10$ $12$
answer edited
in
CO and Architecture
Jun 29, 2018
24.5k
views
gate1996
co-and-architecture
microprogramming
normal
3
answers
18
GATE CSE 2008 | Question: 34
Which of the following must be true for the RFE (Return From Exception) instruction on a general purpose processor? It must be a trap instruction It must be a privileged instruction An exception cannot be allowed to occur during execution of an RFE instruction I only II only I and II only I, II and III only
answer edited
in
CO and Architecture
Jun 29, 2018
11.8k
views
gatecse-2008
co-and-architecture
machine-instruction
normal
4
answers
19
GATE CSE 2016 Set 2 | Question: 32
The width of the physical address on a machine is $40$ bits. The width of the tag field in a $512$ KB $8$-way set associative cache is ________ bits.
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in
CO and Architecture
Jun 29, 2018
17.6k
views
gatecse-2016-set2
co-and-architecture
cache-memory
normal
numerical-answers
4
answers
20
GATE CSE 2008 | Question: 71
Consider a machine with a $2$-way set associative data cache of size $64\text{Kbytes}$ and block size $16\text{bytes}$. The cache is managed using $32\;\text{bit}$ virtual addresses and the page size is $4\text{Kbytes}$. A program to be run on this ... total size of the tags in the cache directory is: $32\text{Kbits}$ $34\text{Kbits}$ $64\text{Kbits}$ $68\text{Kbits}$
answer edited
in
CO and Architecture
Jun 29, 2018
18.4k
views
gatecse-2008
co-and-architecture
cache-memory
normal
4
answers
21
GATE CSE 1989 | Question: 12a
The below figure shows a $B^+$ tree where only key values are indicated in the records. Each block can hold upto three records. A record with a key value $34$ is inserted into the $B^+$ tree. Obtain the modified $B^+$ tree after insertion.
answer edited
in
Databases
Jun 27, 2018
8.1k
views
descriptive
gate1989
databases
b-tree
5
answers
22
GATE IT 2005 | Question: 47
$(34.4)_{8} × \left ( 23.4 \right )_{8}$ evaluates to $(1053.6)_{8}$ $(1053.2)_{8}$ $(1024.2)_{8}$ None of these
edited
in
Digital Logic
Jun 27, 2018
8.0k
views
gateit-2005
digital-logic
number-representation
normal
6
answers
23
GATE CSE 1998 | Question: 2.19
Which of the following query transformations (i.e., replacing the l.h.s. expression by the r.h.s expression) is incorrect? R1 and R2 are relations, C1 and C2 are selection conditions and A1 and A2 are attributes of R1. ... $\pi_{A_1} \left(\sigma_{C_1}\left(R_1\right)\right) \to \sigma_{C_1} \left(\pi_{A_1}\left(R_1\right)\right)$
answer edited
in
Databases
Jun 26, 2018
17.0k
views
gate1998
databases
relational-calculus
normal
10
answers
24
GATE CSE 2016 Set 2 | Question: 49
Consider a non-negative counting semaphore $S$. The operation $P(S)$ decrements $S$, and $V(S)$ increments $S$. During an execution, $20$ $P(S)$ operations and $12$ $V(S)$ operations are issued in some order. The largest initial value of $S$ for which at least one $P(S)$ operation will remain blocked is _______
answer edited
in
Operating System
Jun 26, 2018
15.6k
views
gatecse-2016-set2
operating-system
semaphore
normal
numerical-answers
6
answers
25
GATE IT 2004 | Question: 63
In a certain operating system, deadlock prevention is attempted using the following scheme. Each process is assigned a unique timestamp, and is restarted with the same timestamp if killed. Let $P_h$ ... but starvation-free The scheme is neither deadlock-free nor starvation-free The scheme is both deadlock-free and starvation-free
answer edited
in
Operating System
Jun 26, 2018
13.2k
views
gateit-2004
operating-system
normal
deadlock-prevention-avoidance-detection
4
answers
26
GATE CSE 1989 | Question: 11a
A system of four concurrent processes, $P, Q, R$ and $S$, use shared resources $A, B$ and $C$. The sequences in which processes, $P, Q, R$ and $S$ ... What strategies can be used to prevent deadlocks in a system of concurrent processes using shared resources if preemption of granted resources is not allowed?
answer edited
in
Operating System
Jun 26, 2018
3.2k
views
descriptive
gate1989
operating-system
resource-allocation
10
answers
27
GATE CSE 2007 | Question: 58
Two processes, $P1$ and $P2$, need to access a critical section of code. Consider the following synchronization construct used by the processes: /* P1 */ while (true) { wants1 = true; while (wants2 == true); /* Critical ... waiting. It requires that processes enter the critical section in strict alteration. It does not prevent deadlocks, but ensures mutual exclusion.
answer edited
in
Operating System
Jun 26, 2018
27.0k
views
gatecse-2007
operating-system
process-synchronization
normal
11
answers
28
GATE IT 2005 | Question: 41
Given below is a program which when executed spawns two concurrent processes : semaphore $X : = 0 ;$ /* Process now forks into concurrent processes $P1$ & $P2$ ... (II) are true. (I) is true but (II) is false. (II) is true but (I) is false Both (I) and (II) are false
answer edited
in
Operating System
Jun 26, 2018
23.5k
views
gateit-2005
operating-system
process-synchronization
normal
1
answer
29
GATE CSE 1996 | Question: 21
The concurrent programming constructs fork and join are as below: Fork <label> which creates a new process executing from the specified label Join <variable> which decrements the specified synchronization variable (by $1$) and terminates the process if the new value is not $0$. Show ... $N$ $S3$ $L2$ : join $M$ $S5$ $L3:S2$ Goto $L1$ $L4:S4$ Goto $L2$ Next:
edited
in
Operating System
Jun 26, 2018
6.1k
views
gate1996
operating-system
process-synchronization
normal
descriptive
9
answers
30
GATE CSE 2004 | Question: 21, ISRO2007-44
The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by the instruction set architecture page size number of processes in memory physical memory size
answer edited
in
Operating System
Jun 26, 2018
23.6k
views
gatecse-2004
operating-system
virtual-memory
page-replacement
normal
isro2007
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