| Que. 1 |
The address sequence generated by tracing a particular program executing
in a pure demand paging system with 100 records per page with 1 free
main memory fram is recorded as follows.What is the number of page
faults? 0100,0200,0430,0499,0510,0530,0560,0120,0220,0240,0260,0320,0370 |
| A |
|
13 |
| B |
|
7 |
| C |
|
8 |
| D |
|
10 |
|
| Que. 2 |
A N-bit carry lookhaed adder,where N is a multiple of 4,employs IC's 74181
(4 bit ALU) and 74182(4 bit carry look ahead grnerator) the minimum
addition time using the best architecture for this adder is |
| A |
|
proportional to N |
| B |
|
proportional to log N |
| C |
|
constant |
| D |
|
none of the above |
|
| Que. 3 |
Dirty bit for a page in a page table |
| A |
|
helps avoid unnecessary writes on a paging device |
| B |
|
helps maintain LRU information |
| C |
|
allows only read on a page |
| D |
|
none of the above |
|
| Que. 4 |
Contents of A resister after the execution of the following 8085 microprocessor
program is MIV A,55H MIV C,25H ADDC DAA |
| A |
|
7AH |
| B |
|
80H |
| C |
|
50H |
| D |
|
22H |
|
| Que. 5 |
Each process Pi,i=1.......9 is coaded as follows
repeat
P(mutex)
{critical selection}
v(mutex)
forever
The code of P(10) is identical except that it uses v(mutex) in place of P(mutex).What is the largest
number of processes that can be inside the critical section at any moment |
| A |
|
1 |
| B |
|
2 |
| C |
|
3 |
| D |
|
none of the above |
|
| Que. 6 |
Let R = (a, b, c, d, e, f) be a relation scheme with the following dependencies c-->f, e-->a, ec-->d, a-->b. Which of the following is a key for R ? |
| A |
|
CD |
| B |
|
EC |
| C |
|
AE |
| D |
|
AC |
|
| Que. 7 |
A single instruction to clear the lower four bit of the accumulator in
8085 assembly language is |
| A |
|
XRI OF H |
| B |
|
A NI OH |
| C |
|
X RI FOH |
| D |
|
ANI OF H |
|
| Que. 8 |
Which of the following statment is true? |
| A |
|
ROM is read/write memory |
| B |
|
PC points to the last instruction that was executed |
| C |
|
Stack works on the principle of LIFO |
| D |
|
All instructions affect the flags. |
|
| Que. 9 |
Four 256*8 PROm chips are used to produce a total capacity of 1024*8 the
address bus lines are required are |
| A |
|
4 |
| B |
|
8 |
| C |
|
10 |
| D |
|
16 |
|
| Que. 10 |
Assume that each charecter code consist of8 bits.the number of characters
that can be transmitted per second thriugh an asynchronous serial line
at 2400 band rate and with two stop bit is |
| A |
|
109 |
| B |
|
216 |
| C |
|
218 |
| D |
|
219 |
|
| Que. 11 |
Virtual memory is |
| A |
|
simple to implement |
| B |
|
used on all majour commercial operating system |
| C |
|
useful when fast I/O devices are not available |
| D |
|
less efficient in utilization of memory |
|
| Que. 12 |
The primary quantity of a good working program in the earlier days of
software development in the 1950's and 1960's were |
| A |
|
maintainable |
| B |
|
Readable |
| C |
|
Fast |
| D |
|
On budget and within time |
|
| Que. 13 |
A multi-user, multi-processing operating system cannot be implemented
on hardware that does not support |
| A |
|
address translation |
| B |
|
DMA for the disk transfer |
| C |
|
At least two modes CPU execution |
| D |
|
all of these |
|
| Que. 14 |
Advantage of synchronous sequential circuits memory over asynchronous
once is |
| A |
|
faster operation |
| B |
|
ease to avoiding prblems due to hazards |
| C |
|
lower hardware requirment |
| D |
|
better noise immunity |
|
| Que. 15 |
The total size of address space in a virtual memory system is limited
by |
| A |
|
the length of MAR |
| B |
|
the available secindary storage |
| C |
|
the available main memory |
| D |
|
all of the above |
|
| Que. 16 |
A device employing INTR line for device interrupt puts the CALL instruction
on the data bus while |
| A |
|
INTA is active |
| B |
|
hold is active |
| C |
|
ready is active |
| D |
|
none of these |
|
| Que. 17 |
Which scheduling is not suffer to balady anomoly |
| A |
|
FCFC |
| B |
|
optimal page replacement |
| C |
|
LRU |
| D |
|
Round Robin |
|
| Que. 18 |
I/O vide rection |
| A |
|
implies changing the name of a file |
| B |
|
can be employed to use an existing files as input file for a program. |
| C |
|
implies connection 2 programs though a pipe. |
| D |
|
none of the above |
|
| Que. 19 |
Which of the following device should get higher priority in assigning
interrupts? |
| A |
|
hard disk |
| B |
|
printer |
| C |
|
keyboard |
| D |
|
floopy disk |
|
| Que. 10 |
The main difference between a CISC and RISC processor is/are that a RISC
prcessor typically |
| A |
|
has few ever instructions |
| B |
|
has fewever addressing modes |
| C |
|
has more registers |
| D |
|
all of these |