Computer Science - System Software – Multiple Choice Question

Question 1 of 50

1. Question

which of the following is/are not assembler directive(s)?

START
LOAD
END
BYTE

Question 2 of 50

2. Question

Which of the following remarks about the assembler are true?

It translates mnemonic instruction into machine code.
The instruction formats, addressing modes etc, are of direct concern in assembler design.
Design of an assembler is independent of the source language.
Both (b) and (c)

Question 3 of 50

3. Question

A programming language is to be designed to run on a machine that does not have a big memory. The language should

prefer a two-pass compiler to an one-pass compiler
prefer an one-pass compiler to a two-pass compiler
Prefer an interpreter to a compiler
not support recursion

Question 4 of 50

4. Question

Which of the following about the loader is/are incorrect?

Loader brings object program into memory for execution.
Linkage editors perform linking after loading.
Dynamic linking schemes delay linking until execution time.
Absolute loader modifies the object program so that it can be loaded at any address location

Question 5 of 50

5. Question

Two procedures both of which treat the other as a called procedure and itself the callee, are called as

master-slave routines
sub-sub-routines
co-routines
ambiguous master-slave routines

Question 6 of 50

6. Question

Choose the true statements about the linkage loaders .

The input to it consists of a set of objects programs that are to be linked together
The main data structure needed for linking is an external symbol table.
Pass 1 assigns addresses to all external system
pass 2 performs loading. relocating and linking.

Question 7 of 50

7. Question

Which of the following statements about the macro-processors are incorrect?

The general features such as macro expansion, use of keyword parameters are machine dependent.
Macro invocation includes the name of the macro being called and the arguments to be used.
Macro definition is also referred to as macro call.
macros cannot be nested.

Question 8 of 50

8. Question

Transfer of information to and from the main memory takes place in terms of

bits
bytes
words
nibbles

Question 9 of 50

9. Question

The output of the lexical analyzer is

a set of regular expresions
syntax tree
set of tokens
string of characters

Question 10 of 50

10. Question

An interpreter is preferred over a compiler

when efficient use of computer resources is the consideration
during program development phase
when storage space is to be minimized
all of the above

Question 11 of 50

11. Question

A compiler-compiler is a/an

compiler which compiles a compiler program
software tool used in automatic generation of a compiler
compiler written in the same language it compiles
another name for cross-compiler

Question 12 of 50

12. Question

A compiler which allows only the modified section of the source code to be recompiled is called as

incremental compiler
reconfigurable compiler
dynamic compiler
Selective compiler

Question 13 of 50

13. Question

Which of the following system software resides in main memory always?

Text editor
Assembler
Linker
Loader

Question 14 of 50

14. Question

In a two-pass assembler the pseudo-code EQU is to be evaluated during

pass 1
pass 2
not evaluated by the assembler
none of the above

Question 15 of 50

15. Question

Effective address got by index mode will be the same as that of register indirect mode when the index register has the value

0
1
-1
can never be the same

Question 16 of 50

16. Question

When exceptional situation occurs outside the CPU the H/w signal given is

reset
interrupt
hold
wait

Question 17 of 50

17. Question

The root directory of a disk should be placed

at a fixed address in main memory
at a fixed location on the disk
anywhere on the disk
at a fixed location on the system disk

Question 18 of 50

18. Question

Efficient use of addressing modes

speeds up exceution
reduces the number of instructions
reduces the size of instructions
none of the above

Question 19 of 50

19. Question

The correct sequence of time delays that happen during a data transfer form a disk to memory is

seek time, latency time and transfer time
seek time, access time and transfer time
latency time, seek time and transfer time
latency time, access time and transfer time

Question 20 of 50

20. Question

Writing a software in assembly language is preferred to writing in a high level language when

memory space is limited
optimal use of the hardware resources available is of primary concern
programmer's productivity is important
portability is important

Question 21 of 50

21. Question

Which of the following are the addressing modes support Indexing ?

Relative
memory indirect
immediate
Direct

Question 22 of 50

22. Question

Which of the following are the advantages of 2’s complement over 1’s complement ?

Easy to implement using digital components
subtraction can be done by a single addtion
It has only one zero
All of the above

Question 23 of 50

23. Question

Pick the functions that are completely performed in pass 1.

processing of DB pseudo-op
Updating the location counter
Processing of EQU pseudo-op
Processing of DS pseudo-op

Question 24 of 50

24. Question

Pick the functions that are completely performed in pass 2.

Creating the proper address mode using the base table.
Updating the location counter
Processing of EQU pseudo-op
Generation of object code using machine operation table

Question 25 of 50

25. Question

Pick the correct statement(s) about LTORG.

It is a pseudo-op.
It is used to load the object program at some specified memory location that is given in the operand field.
It is used to place the literals definition in a specified memory location that is gives is the operand field
It creates a literal pool that contains all the literal operands used since the previous LTORG.

Question 26 of 50

26. Question

Pick the machine independent phase(s) of the compiler.

Syntax analysis
code generation
Lexical analysis
Intermediate code generations

Question 27 of 50

27. Question

Which of the following statement(s) about loading is/are true?

Modification records are used for specifying program relocation in relative addressing mode instructions
Modification records are best suited for specifying program relocation in direct addressing and fixed instruction format.
Text record uses a relocation bit associated with each word of the object code in direct addressing and fixed instruction format.
Modification records are best suited for relative addressing mode

Question 28 of 50

28. Question

Pick the machine dependent operating system features.

interrupt processing
File processing
Process scheduling
Job scheduling

Question 29 of 50

29. Question

pick the machine independent operation system features.

I/O supervision
file processing
Management of real memory
Job scheduling

Question 30 of 50

30. Question

Pick the machine independent step(s) that can be used to optimize the memory requirement of a program.

Eliminating loop invariant computations
Code hoisting
Elimination of common sub-expression
Register allocation strategies

Question 31 of 50

31. Question

What interrupt is generated when an attempt to divide by zero is made?

Supervisor call interrupt (SVC)
Program interrupt
I/O interrupt
Timer interrupt

Question 32 of 50

32. Question

Pick the class of interrupt with highest priority.

Supervisor call interrupt (SVC)
Program interrupt
I/O interrupt
Timer interrupt

Question 33 of 50

33. Question

pick the class of interrupt with lowest priority.

Supervisor call interrupt (SVC)
Program interrupt
I/O interrupt
Timer interrupt

Question 34 of 50

34. Question

The delay between job submission and job completion is called

turnaround time
in-process time
response time
waiting time

Question 35 of 50

35. Question

Which of the following techniques is preferable for transferring large amount of data to and from a memory in a short time?

Programmed I/O
Interrupt-driven I/O
DMA
None of the above

Question 36 of 50

36. Question

Privileged instructions can be executed

Only in monitor mode
only in user mode
both in user and monitor mode
none of the above

Question 37 of 50

37. Question

The first pass of a simple two-pass assembler.

allocates spaces for the literals
computes the total length of the program
builds the symbol table for the symbols and their values
generates code for all the load and register instructions

Question 38 of 50

38. Question

The ideal choice for interrupt oriented applications is

Z-80
Motorala-6800
8085
8008

Question 39 of 50

39. Question

Choose the correct statement.

Any software can be simulated by hardware
Any hardware can be simulated by software
Firmware is nothing but hardware implementation of software.
firmware is nothing but software implementation of hardware.

Question 40 of 50

40. Question

Which of the following is always true?

A compiled program uses more memory than an interpreted program.
A compiler converts a program to a lower-level language for execution
A compiler takes less memory than an interpreter.
Compiled programs take more time for execution than interpreted programs.

Question 41 of 50

41. Question

In a two-pass assembler, adding literals to literal table and address resolution of local symbols are done during.

first pass and second pass respectively
second pass
second pass and first pass respectively
first pass

Question 42 of 50

42. Question

In a two-pass assembler the object code generation is done during the

second pass
first pass
zeroth pass
none of the above

Question 43 of 50

43. Question

The data transfer rate of a double density floppy disk system is about

5 Kbits/sec
50 Kbits/sec
500 Kbits/sec
5000 Kbits/sec

Question 44 of 50

44. Question

A linker is given object modules for a set of programs that were compiled separately. What information need not be included in an object module?

Object code
Relocation bits
Names and locations of all external symbols defined in the object module
Absolute addresses of internal symbols

Question 45 of 50

45. Question

Generation of intermediate code based on an abstract machine model is useful in compilers because.

it makes implementation of lexical and syntax analysis easier
syntax-directed translation can be written for intermediate code generation
it enhances the portability of the front end of the compiler.
it is not possible to generate code for real machines directly from high level language programs

Question 46 of 50

46. Question

Choose the correct statement(s)

Macro definitions cannot appear within another macro definitions in assembly language programs
Overlaying is used to run a program which is longer than the address space of a computer
Virtual memory can be used to accommodate a program which is longer than the address space of a computer.
It is possible to write interrupt service routines in a high level language.

Question 47 of 50

47. Question

A software is to be developed for a system which has a small memory. The software should

use recursion wherever possible
avoid using recursion
use macros instead of functions
not use macros instead of functions

Question 48 of 50

48. Question

ADD 6 (immediate) To R (indirect) gives the value

20
7
10
13

Question 49 of 50

49. Question

If the effective address of X is got by auto-increment mode and the effective address of Y by auto-decrements mode then the instruction ADD X To Y, gives the value

16
14
20
10

Question 50 of 50

50. Question

If the instruction ADD TO B gives 16, then the addressing mode for A, B will be

register(direct) and auto-increment indirect respectively
register(indirect) and auto-increment indirect respectively
register(direct) and auto-increment direct respectively
register(indirect) and auto-increment direct respectively