SOLVED QUESTIONS OF PREVIOUS EXAMS

Which layer of OS I reference model is responsible for decomposition of messages and generation of sequence numbers to ensure correct re-composition from end to end of the network ?

(A) Physical    (B) Data-link
(C) Transport    (D) Application

Ans.: c.)

Networks

The start and stop bits are used in serial communication for
(A) error detection
(B) error correction
(C) synchronization
(D) slowing down the communication

Ans.: c.)

Synchronization is the coordination of events to operate a system in unison

________is a type of transmission impairment in which the signal looses strength due to the resistance of the transmission medium.
(A) Attenuation  (B) Distortion
(C) Noise     (D) Decibel

Ans.: a.)

a. Indexed Addressing               i. is not used when an operand is moved from memory into a register or from a register to memory.
b. Direct Addressing                 ii. Memory address is computed    by adding up two registers plus an (optional) offset.
c. Register Addressing               iii. Addressing memory by giving a register plus a content offset.
d. Base-Indexed Addressing      iv. can only be used to access global variables whose address is known at compile time.
Codes :  
    a    b   c    d
(A) ii    i   iv   iii
(B) ii    iv  i    iii
(C) iii    iv  i    ii
(D) iii    i   iv   ii

Ans.: c.)

Microprocessor

Synchronization is achieved timing device called a_______which generates a periodic train of ________.
(A) clock generator, clock pulse
(B) master generator, clock pulse
(C) generator, clock
(D) master clock generator, clock pulse  

Ans.: a.)  

What   will   be   the   output   of  the following logic diagram ?

(A) x OR   y
(B) x AND  y
(C) x XOR  y
(D) X XNOR y

Ans.: c.)

Digital logics

Explanation:

x	y	- X	- y	- x.y	- xy	-     - (xy) + (xy)
0	0	1	1	0	0	0
0	1	1	0	0	1	1
1	0	0	1	1	0	1
1	1	0	0	0	0	0

The essential difference between traps and interrupts is
(A) traps are asynchronous and interrupts are synchronous with the program.
(B) traps are synchronous and interrupts are asynchronous with the program.
(C) traps are synchronous and interrupts are asynchronous with the I/O devices.
(D) None of these.

Ans.: b.)

DLF

Which of the following is not true with respect to a trackball and/or spaceball ?
I.   A trackball is a two dimensional positioning device while as a spaceball provides six degrees of freedom. 
II.  Unlike the trackball a spaceball does not actually move. 
III. A trackball is a three dimensional positioning device while as a spaceball provides six degrees of freedom.
(A)  I & II    (B)    II & III
(C)  II only    (D)    III only

Ans.: d.)

Windows

Which of the following statement(s) is (are) true ?
I.   Two successive translations are additive.
II.  Two successive rotations are additive.
III. Two successive scaling operations are multiplicative.
(A) I and II
(B) I and III
(C) II and III
(D) All the above

Ans.: d.)

Computer Graphics

 In Unix, how do you check that two given strings a and b are equal ?
(A) test $a -eq $b
(B) test Sa -equal $b
(C) test $a = Sb
(D) Sh -C test $a = = $b

Ans.: c.)

Unix 

To place a sound into a word document, following feature of windows is used :
(A) Clip board
(B) Task switching
(C) C Win App
(D) OLE

Ans.: d.)

Windows

Translation Look-aside Buffer (TLB) is
(A) a cache-memory in which item to be searched is compared one-by-one with the keys.
(B) a cache-memory in which item to be searched is compared with all the keys simultaneously.
(C) an associative memory in which item to be searched is compared one-by-one with the keys.
(D) an associative memory in which item to be searched is compared with all the keys simultaneously.

Ans.: d.)

OS

Simplest way of deadlock recovery is
(A) Roll back
(B) Preempt resource
(C) Lock one of the processes
(D) Kill one of the processes

Ans.: a.)

OS

The directory structure used in Unix file system is called
(A) Hierarchical directory
(B) Tree structured directory
(C) Directed acyclic graph
(D) Graph structured directory

Ans.: a.)
Unix

Possible thread states in Windows 2000 operating system include :
(A) Ready, running and waiting
(B) Ready, standby, running, waiting, transition and terminated
(C) Ready, running, • waiting, transition and terminated
(D) Standby, running, transition and terminated

Ans.: b.)

Windows

 When data and acknowledgement are sent in the same frame, this is called as
(A) Piggy packing
(B) Piggy backing
(C) Back packing
(D) Good packing
Ans.: b.)
Piggybacking is a bi-directional data transmission technique in the network layer (OSI model).
Network question.
 

Using the RSA public key crypto system, if p = 13, q = 31 and d = 7, then the value of e is
(A) 101  (C) 105
(B) 103  (D) 107

Ans.: b.)

Network security and cryptography

 FAN IN of a component A is defined as
(A) Number of components that can call or pass control to component A.
(B) Number of components that are called by component A.
(C) Number of components related to component A.
(D) Number of components dependent on component A.
Ans.: a.)
Fan-in is the number of inputs a gate can handle
Fan out is the number of gate inputs you can connect to a gate output

The relationship of data elements in a module is called
(A) Coupling
(B) Modularity
(C) Cohesion
(D) Granularity
Ans.: c.)
Software engineering
cohesion refers to the degree to which the elements of a module belong together. the tendency to stick together

Testing of software with actual data and in actual environment is called
(A) Alpha testing
(B) Beta testing
(C) Regression testing
(D) None of the above
Ans.: b.)
Software testing concept.
Beta testing is a part of acceptance test.