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computer organization and architecture mcq

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 computer organization and architecture mcq 

Questions 41 To 50


41.
What is Q, when S = 1 and R = 1 for SR flip-flop?
(a)
No Change
(b)
Clear to 0
(c)
Set to 1
(d)
Complement of previous output
(e)
Indeterminate.
42.
What does T stands for in T flip-flop?
(a)
Top
(b)
Type
(c)
Toggle
(d)
Tickle
(e)
Bottom.
43.
In which type of flip-flop the indeterminate condition of the SR flip-flop (when S=R=1) is eliminated?
(a)
Edge-triggered flip-flop
(b)
JK flip-flop
(c)
D flip-flop
(d)
T flip-flop
(e)
KJ flip-flop.
44.
The bulk of the binary information in a digital computer is stored in memory, but all computations are done in
(a)
Timing Control
(b)
Memory Registers
(c)
Processor Registers
(d)
Program Control
(e)
Processor Control.
45.
Information transfer from one register to another is designated in symbolic form by means of a
(a)
Control Function
(b)
Op Code
(c)
Registers
(d)
Replacement Operator
(e)
Flip-flops.
46.
The registers found in the processor unit are
(a)
Operational registers
(b)
Memory registers
(c)
Storage registers
(d)
Binary registers
(e)
Control registers.

47.
Techniques that automatically move program and data blocks into the physical main memory when they are required for execution are called                  
(a)
Associative-Mapping techniques
(b)
Main Memory techniques
(c)
Virtual Memory techniques
(d)
Cache Memory techniques
(e)
Primary Memory techniques.
48.
Given below are the octal numbers and their Binary Coded Decimal (BCD) equivalents, which are not in order. Match the following octal numbers with their respective BCD equivalents and select the correct sequence.
Octal number                BCD equivalent
10                                    i.        111111
  9                                    ii.       110010
20                                    iii.      001001
50                                    iv.      010100
77                                    v.       001010

(a)
iii, ii, i, iv, v
(b)
v, iv, ii, iii, i
(c)
v, iv, i, iii, ii
(d)
i, ii, iv, v, iii
(e)
v, iv, iii, ii, i.
49.
The processor, _________ and I/O Devices are interconnected by means of a common bus.                 
(a)
Cache Memory
(b)
Auxiliary Memory
(c)
Virtual Memory
(d)
Main Memory
(e)
Primary Memory.
50.
System Software usually includes a program called a _______ , which helps the programmer to find errors in a program.
(a)
Write Buffer
(b)
Read Buffer
(c)
Debugger
(d)
Both (a) and (c) above
(e)
Both (b) and (c) above.

Answers


41.
Answer :   (e)
Reason:    When R = 1 and S = 1, race will always end with Master Latch in the logic 1 state, but this will not be certain with real components.
42.
Answer :   (c)
Reason:    Toggle flip-flop as it changes its output on each clock edge.
43.
Answer :   (b)
Reason:    To SR flip-flop two new connections from Q and Q’ outputs back to original input gates eliminate the indeterminate condition.
44.
Answer :   (c)
Reason:    The operation part of an instruction code specifies the operation to be performed. This operation must be executed on some data stored in memory and/or processor registers. An instruction code, therefore, must specify not only the operation, but also the register or memory words where the operands are to be found, as well as the register or memory words where the result is to be stored. For this reason, the bulk of binary information in a digital computer is stored in memory, but all computations are done in Processor Registers.
45.
Answer :   (d)
Reason:    A replacement operator consisting of the information transfer from one register to another, is designated in symbolic form.
46.
Answer :   (a)
Reason:    Registers found in processor are called operational registers and in memory unit are called storage registers.
47.
Answer :   (c)
Reason:    A virtual memory system provides a mechanism for translating program-generated addresses into correct main memory locations. This is done dynamically, while programs are being executed in the CPU. The translation or mapping is handled automatically by the hardware by means of a mapping table

48.
Answer :   (b)
Reason:    The octal number and their binary coded equivalent BCD is a straight assignment of binary equivalent. It is possible to assign weights to the binary bits according to their position as per conversion of octal number to binary number.
49.
Answer :   (a)
Reason:    The processor, cache memory and I/O devices are interconnected by means of a common bus.
50.
Answer :   (c)
Reason:    Debugger is a program, which finds errors in program.

Questions 51 To 60


51.
To convert octal code to binary code which of the following digital functions should be used?
(a)
Decoder
(b)
Encoder
(c)
Multiplexer
(d)
Demultiplexer
(e)
Half adder.
52.
A full-adder is simply a connection of two half-adders joined by a,
(a)
AND gate
(b)
OR gate
(c)
NAND gate
(d)
NOR gate
(e)
XOR gate.
53.
The correspondence between the main memory blocks and those in the cache is specified by a
(a)
Miss penalty
(b)
Replacement algorithms
(c)
Hit rate
(d)
Page fault
(e)
Mapping functions.
54.
The number of 256*4 RAM chips required to construct 2KB CACHE is
(a)
  8
(b)
  2
(c)
  4
(d)
16
(e)
32.
55.
The set of physical addresses is called
(a)
Disk Space
(b)
Address Space
(c)
Pages
(d)
Frames
(e)
Location.
56.
What is the name of device that is allowed to initiate data transfer on the bus?
(a)
Bus Master
(b)
Bus Arbitration
(c)
Bus Cycle
(d)
Bus Request
(e)
Parallel Bus.
57.
The DMA transfer technique where transfer of one word data at a time is called
(a)
Cycle stealing
(b)
Memory stealing
(c)
Hand-shaking
(d)
Inter-leaving
(e)
Bus stealing.
58.
What interface is used to connect the processor to I/O devices that require transmission of data one bit at a time?
(a)
Parallel
(b)
Serial
(c)
Output
(d)
Input
(e)
Bus.
59.
What are the building blocks of combinational circuits?
(a)
Flip-flops
(b)
Logic gates
(c)
Latches
(d)
Registers
(e)
Inputs.
60.
The transfer of new information into the register is called
(a)
Execution
(b)
Loading
(c)
Shifting
(d)
Configuring
(e)
Uploading.

Answers


51.
Answer :   (a)
Reason:    Decoder.
52.
Answer :   (b)
Reason:    A full-adder is simply a connection of two half-adders joined by a OR gate, and other half-adder simplify the AND gate also.
53.
Answer :   (e)
Reason:    The corresponding  between the main memory blocks and those in the cache is specified by a mapping function, because the basic characteristic of cache memory is fast access time. Therefore, very little or no time must be wasted when searching for words in the cache.
54.
Answer :   (d)
Reason:    16 RAM chips of size 256*4 are needed to construct a CACHE of size 2KB
55.
Answer :   (b)
Reason:    The collection of address spaces in a physical memory is called address space.
56.
Answer :   (a)
Reason:    The Bus master is allowed to initiate data transfer on the bus.
57.
Answer :   (a)
Reason:    Transfer of one word data at a time using DMA transfer technique is called Cycle Stealing.
58.
Answer :   (b)
Reason:    Serial interface transfers one bit at a time, whereas others can handle more than one bit.
59.
Answer :   (b)
Reason:    In a  based Logical gates are building blocks of combinational circuits whereas, flipflops are combination of logic gates, registers are memory storages.
60.
Answer :   (b)
Reason:    Entering new information into a register is called loading.


Questions 61 To 70


61.
Convert decimal value (888)10 to base-5.
(a)
(444)5
(b)
(12023)5
(c)
(131313)5
(d)
(12021)5
(e)
(31320)5.
62.
Consider the following logic function f(ABC).
f(A,B,C) =  ( A + B + C’) . (A + B’+ C’)
Which of the following would be the result if the above logic function is to be simplified using k-maps?
(a)
C’ + A
(b)
C + C’A’
(c)
C.A’
(d)
C’.A
(e)
C’.A’ + B.
63.
What is the equivalent in hexadecimal for the decimal number 973?
(a)
4BC
(b)
CB4
(c)
6D
(d)
3CD
(e)
4CD.
64.
What is the word size of a 8086 processor?
(a)
    8 bits
(b)
  16 bits
(c)
  32 bits
(d)
  64 bits
(e)
128 bits.
65.
What kind of Information is stored inside the computer?
(a)
Binary form
(b)
ASCII code form
(c)
Decimal form
(d)
Alpha numeric
(e)
Numeric form.
66.
What is a parity bit?
(a)
It is used to indicate uppercase letters
(b)
It is used to detect errors
(c)
It is the first bit in a byte
(d)
It is the last bit in a byte
(e)
It is used to indicate lowercase letters.
67.
What is the minimum number of bits required to store the Hexadecimal number FF?
(a)
  2
(b)
  4
(c)
  8
(d)
16
(e)
32.
68.
What is the purpose of the floating point unit(FPU)?
(a)
Makes integer arithmetic faster
(b)
Makes pipelining efficient
(c)
Increases RAM capacity
(d)
Makes some arithmetic calculations faster
(e)
Decreases RAM capacity.
69.
Which of the following is not a type of processor?
(a)
PowerPC 601
(b)
Motorola 8086
(c)
Motorola 68000
(d)
Intel Pentium
(e)
Z80.
70.
Cycle stealing is/are used in which concept?
(a)
Programmed I/O
(b)
DMA
(c)
Interrupts
(d)
Memory mapped I/O
(e)
All of the above.

Answers


61.
Answer :   (b)
Reason  :  Divide the given number 888 by 5 and write all the remainder terms from the bottom to up and finally we will get (12023) to the base 5
62.
Answer :   (a)
Reason  :  C’ + A
63.
Answer :   (d)
Reason  :  3CD
64.
Answer :   (b)
Reason  :  8086 is a 16 bit processor.
65.
Answer :   (a)
Reason  :  The data inside a computer is represented in Binary form i.e (0’s and 1’s).
66.
Answer :   (b)
Reason  :  A parity bit is used to detect errors.
67.
Answer :   (b)
Reason  :  The minimum number of bits required to store a Hexadecimal number FF is 4.
68.
Answer :   (d)
Reason  :  Makes some arithmetic calculations faster.
69.
Answer :   (b)
Reason  :  Motorola 8086 is not a processor.
70.
Answer :   (b)
Reason  :  Cycle Stealing concept is used in DMA .


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