650+ Computer Architecture Solved MCQs

201.

The status flags required for data transfer is present in            

A. device
B. device driver
C. interface circuit
D. none of the mentioned
Answer» C. interface circuit
Explanation: the circuit holds the flags which are required for data transfers.
202.

User programmable terminals that combine VDT hardware with built-in microprocessor is            

A. kips
B. pc
C. mainframe
D. intelligent terminals
Answer» D. intelligent terminals
Explanation: none.
203.

Which most popular input device is used today for interactive processing and for the one line entry of data for batch processing?

A. mouse
B. magnetic disk
C. visual display terminal
D. card punch
Answer» A. mouse
Explanation: in batch processing systems the processes are grouped into batches and they’re executed in batches.
204.

              is used as an intermediate to extend the processor BUS.

A. bridge
B. router
C. connector
D. gateway
Answer» A. bridge
Explanation: the bridge circuit is basically used to extend the processor bus to connect devices.
205.

                  is an extension of the processor BUS.

A. scsi bus
B. usb
C. pci bus
D. none of the mentioned
Answer» C. pci bus
Explanation: the pci bus is used as an extension of the processor bus and devices connected to it, is like connected to the processor itself.
206.

What is the full form of ISA?

A. international american standard
B. industry standard architecture
C. international standard architecture
D. none of the mentioned
Answer» B. industry standard architecture
Explanation: the isa is an architectural standard developed by ibm for its pc’s.
207.

What is the full form of ANSI?

A. american national standards institute
B. architectural national standards institute
C. asian national standards institute
D. none of the mentioned
Answer» A. american national standards institute
Explanation: the ansi is one of the standard architecture used by companies in designing the systems.
208.

SCSI stands for

A. signal computer system interface
B. small computer system interface
C. small coding system interface
D. signal coding system interface
Answer» B. small computer system interface
Explanation: the scsi bus is used to connect disks and video controllers.
209.

ISO stands for

A. international standards organisation
B. international software organisation
C. industrial standards organisation
D. industrial software organisation
Answer» A. international standards organisation
Explanation: the iso is yet another architectural standard, used to design systems.
210.

The system developed by IBM with ISA architecture is               

A. sparc
B. sun-sparc
C. pc-at
D. none of the mentioned
Answer» C. pc-at
Explanation: none.
211.

IDE disk is connected to the PCI BUS using               interface.

A. isa
B. iso
C. ansi
D. ieee
Answer» A. isa
Explanation: none.
212.

IDE stands for

A. integrated device electronics
B. international device encoding
C. industrial decoder electronics
D. international decoder encoder
Answer» A. integrated device electronics
Explanation: the ide interface is used to connect the hard disk to the processor in most of the pentium processors.
213.

The            circuit enables the generation of the ASCII code when the key is pressed.

A. generator
B. debouncing
C. encoder
D. logger
Answer» C. encoder
Explanation: the signal generated upon the pressing of a button is encoded by the encoder circuit into the corresponding ascii value.
214.

To overcome multiple signals being generated upon a single press of the button, we make use of               

A. generator circuit
B. debouncing circuit
C. multiplexer
D. xor circuit
Answer» B. debouncing circuit
Explanation: when the button is pressed, the contact surfaces bounce and hence it might lead to the generation of multiple signals. in order to overcome this, we use debouncing circuits.
215.

The best mode of connection between devices which need to send or receive large amounts of data over a short distance is            

A. bus
B. serial port
C. parallel port
D. isochronous port
Answer» C. parallel port
Explanation: the parallel port transfers around 8 to 16 bits of data simultaneously over the lines, hence increasing transfer rates.
216.

The output of the encoder circuit is/are               

A. ascii code
B. ascii code and the valid signal
C. encoded signal
D. none of the mentioned
Answer» B. ascii code and the valid signal
Explanation: the encoder outputs the ascii value along with the valid signal which indicates that a key was pressed.
217.

The disadvantage of using a parallel mode of communication is               

A. it is costly
B. leads to erroneous data transfer
C. security of data
D. all of the mentioned
Answer» A. it is costly
Explanation: the parallel mode of data transfer is costly as it involves data being sent over parallel lines.
218.

In a 32 bit processor, the A0 bit of the address line is connected to            of the parallel port interface.

A. valid bit
B. idle bit
C. interrupt enable bit
D. status or data register
Answer» D. status or data register
Explanation: none.
219.

The Status flag circuit is implemented using            

A. rs flip flop
B. d flip flop
C. jk flip flop
D. xor circuit
Answer» B. d flip flop
Explanation: the circuit is implemented using the edge triggered d flip flop, that
220.

In the output interface of the parallel port, along with the valid signal                is also sent.

A. data
B. idle signal
C. interrupt
D. acknowledge signal
Answer» B. idle signal
Explanation: the idle signal is used to check if the device is idle and ready to receive data.
221.

DDR stands for                       

A. data direction register
B. data decoding register
C. data decoding rate
D. none of the mentioned
Answer» A. data direction register
Explanation: this register is used to control the flow of data from the dataout register.
222.

In a general 8-bit parallel interface, the INTR line is connected to                 

A. status and control unit
B. ddr
C. register select
D. none of the mentioned
Answer» A. status and control unit
Explanation: none.
223.

The mode of transmission of data, where one bit is sent for each clock cycle is               

A. asynchronous
B. parallel
C. serial
D. isochronous
Answer» D. isochronous
Explanation: in the isochronous mode of transmission, each bit of the data is sent per each cycle.
224.

The transformation between the Parallel and serial ports is done with the help of               

A. flip flops
B. logic circuits
C. shift registers
D. none of the mentioned
Answer» C. shift registers
Explanation: the shift registers are used to output the data in the desired format based on the need.
225.

The serial port is used to connect basically            and processor.

A. i/o devices
B. speakers
C. printer
D. monitor
Answer» A. i/o devices
Explanation: the serial port is used to connect the keyboard and other devices which input or output one bit at a time.
226.

The double buffer is used for

A. enabling retrieval of multiple bits of input
B. combining the input and output operations
C. extending the buffer capacity
D. none of the mentioned
Answer» A. enabling retrieval of multiple bits of input
Explanation: none.
227.

UART stands for                   

A. universal asynchronous relay transmission
B. universal accumulator register transfer
C. universal asynchronous receiver transmitter
D. none of the mentioned
Answer» C. universal asynchronous receiver transmitter
Explanation: the uart is a standard developed for designing serial ports.
228.

The key feature of UART is                     

A. its architectural design
B. its simple implementation
C. its general purpose usage
D. its enhancement of connecting low speed devices
Answer» D. its enhancement of connecting low speed devices
Explanation: none.
229.

The data transfer in UART is done in

A. asynchronous start stop format
B. synchronous start stop format
C. isochronous format
D. ebdic format
Answer» A. asynchronous start stop format
Explanation: this basically means that the data transfer is done in asynchronous mode.
230.

The standard used in serial ports to facilitate communication is            

A. rs-246
B. rs-lnk
C. rs-232-c
D. both rs-246 and rs-lnk
Answer» C. rs-232-c
Explanation: this is a standard that acts as a protocol for message communication involving serial ports.
231.

In a serial port interface, the INTR line is connected to            

A. status register
B. shift register
C. chip select
D. none of the mentioned
Answer» A. status register
Explanation: none.
232.

The PCI follows a set of standards primarily used in            PC’s.

A. intel
B. motorola
C. ibm
D. sun
Answer» C. ibm
Explanation: the pci bus has a closer resemblance to ibm architecture.
233.

The               is the BUS used in Macintosh PC’s.

A. nubus
B. eisa
C. pci
D. none of the mentioned
Answer» A. nubus
Explanation: the nubus is an extension of the processor bus in macintosh pc’s.
234.

The key feature of the PCI BUS is

A. low cost connectivity
B. plug and play capability
C. expansion of bandwidth
D. none of the mentioned
Answer» B. plug and play capability
Explanation: the pci bus was the first to introduce plug and play interface for i/o devices.
235.

PCI stands for                 

A. peripheral component interconnect
B. peripheral computer internet
C. processor computer interconnect
D. processor cable interconnect
Answer» A. peripheral component interconnect
Explanation: the pci bus is used as an extension for the processor bus.
236.

The PCI BUS supports            address space/s.

A. i/o
B. memory
C. configuration
D. all of the mentioned
Answer» D. all of the mentioned
Explanation: the pci bus is mainly built to provide a wide range of connectivity for devices.
237.

              address space gives the PCI its plug and plays capability.

A. configuration
B. i/o
C. memory
D. all of the mentioned
Answer» A. configuration
Explanation: the configuration address space is used to store the details of the connected device.
238.

           provides a separate physical connection to the memory.

A. pci bus
B. pci interface
C. pci bridge
D. switch circuit
Answer» C. pci bridge
Explanation: the pci bridge is a circuit that acts as a bridge between the bus and the memory.
239.

When transferring data over the PCI BUS, the master as to hold the address until the completion of the transfer to the slave.

A. true
B. false
Answer» B. false
Explanation: the address is stored by the slave in a buffer and hence it is not required by the master to hold it.
240.

The master is also called as            in PCI terminology.

A. initiator
B. commander
C. chief
D. starter
Answer» A. initiator
Explanation: the master is also called as an initiator in pci terminology as it is the one that initiates a data transfer.
241.

Signals whose names end in          are asserted in the low voltage state.

A. $
B. #
C. *
D. !
Answer» B. #
Explanation: none.
242.

A complete transfer operation over the BUS, involving the address and a burst of data is called            

A. transaction
B. transfer
C. move
D. procedure
Answer» A. transaction
Explanation: none.
243.

The device connected to the BUS are given addresses of          bit.

A. 24
B. 64
C. 32
D. 16
Answer» B. 64
Explanation: each of the devices connected to the bus will be allocated an address during the initialization phase.
244.

The PCI BUS has            interrupt request lines.

A. 6
B. 1
C. 4
D. 3
Answer» C. 4
Explanation: the interrupt request lines are used by the devices connected to raise the interrupts.
245.

           signal is sent by the initiator to indicate the duration of the transaction.

A. frame#
B. irdy#
C. tmy#
D. seld#
Answer» A. frame#
Explanation: the frame signal is used
246.

              signal is used to enable commands.

A. frame#
B. irdy#
C. tmy#
D. c/be#
Answer» D. c/be#
Explanation: the signal is used to enable 4 command lines.
247.

IRDY# signal is used for                 

A. selecting the interrupt line
B. sending an interrupt
C. saying that the initiator is ready
D. none of the mentioned
Answer» C. saying that the initiator is ready
Explanation: the initiator transmits this signal to tell the target that it is ready.
248.

The signal used to indicate that the slave is ready is            

A. slry#
B. trdy#
C. dsdy#
D. none of the mentioned
Answer» B. trdy#
Explanation: none.
249.

DEVSEL# signal is used                     

A. to select the device
B. to list all the devices connected
C. by the device to indicate that it is ready for a transaction
D. none of the mentioned
Answer» C. by the device to indicate that it is ready for a transaction
Explanation: this is signal is activated by the device after it as recognized the address and commands put on the bus.
250.

The signal used to initiate device select                   

A. irdy#
B. s/be
C. devsel#
D. idsel#
Answer» D. idsel#
Explanation: this signal is used to initialization of device select.
251.

The key features of the SCSI BUS are

A. the cost effective connective media
B. the ability overlap data transfer requests
C. the highly efficient data transmission
D. none of the mentioned
Answer» B. the ability overlap data transfer requests
Explanation: the scsi bus can overlap various data transfer requests by the devices.
252.

In a data transfer operation involving SCSI BUS, the control is with               

A. initiator
B. target
C. scsi controller
D. target controller
Answer» D. target controller
Explanation: the initiator involves in the arbitration process and after winning the bus it’ll hand over the control to the target controller.
253.

In SCSI transfers the processor is not aware of the data being transferred.

A. true
B. false
Answer» A. true
Explanation: the processor or the controller is unaware of the data being transferred.
254.

What is DB(P) line?

A. that the data line is carrying the device information
B. that the data line is carrying the parity information
C. that the data line is partly closed
D. that the data line is temporarily occupied
Answer» B. that the data line is carrying the parity information
Explanation: none.
255.

The BSY signal signifies                     

A. the bus is busy
B. the controller is busy
C. the initiator is busy
D. the target is busy
Answer» A. the bus is busy
Explanation: this signal is generally initiated when the bus is currently occupied in an operation.
256.

The SEL signal signifies                     

A. the initiator is selected
B. the device for bus control is selected
C. that the target is being selected
D. none of the mentioned
Answer» B. the device for bus control is selected
Explanation: this signal is usually asserted during the selection or reselection process.
257.

                  signal is asserted when the initiator wishes to send a message to the target.

A. msg
B. app
C. sms
D. atn
Answer» D. atn
Explanation: the atn signal is short for attention, which is used to intimate the target that the initiator sent a message to it.
258.

The MSG signal is used                     

A. to send a message to the target
B. to receive a message from the mailbox
C. to tell that the information being sent is a message
D. none of the mentioned
Answer» C. to tell that the information being sent is a message
Explanation: none.
259.

           is used to reset all the device controls to their startup state.

A. srt
B. rst
C. atn
D. none of the mentioned
Answer» B. rst
Explanation: none.
260.

SCSI stands for

A. small computer system interface
B. switch computer system interface
C. small component system interface
D. none of the mentioned
Answer» A. small computer system interface
Explanation: the scsi bus is one of the expansion buses used in a system.
261.

ANSI stands for

A. american national system interface
B. ascii national standard interface
C. american network system interface
D. american national standard institute
Answer» D. american national standard institute
Explanation: this a standard for designing buses and other system components.
262.

A narrow SCSI BUS has            data lines.

A. 6
B. 8
C. 16
D. 4
Answer» B. 8
Explanation: the scsi bus which is narrow is capable of transferring 8 bits of data at a time.
263.

HVD stands for                     

A. high voltage differential
B. high voltage density
C. high video definition
D. none of the mentioned
Answer» A. high voltage differential
Explanation: this is a type of signaling which uses 5v of current.
264.

For better transfer rates on the SCSI BUS the length of the cable is limited to

A. 2m
B. 4m
C. 1.3m
D. 1.6m
Answer» D. 1.6m
Explanation: to increase the transmission rate in scsi in se mode of transfer the wire length is restricted to 1.6m.
265.

The mode of data transfer used by the controller is            

A. interrupt
B. dma
C. asynchronous
D. synchronous
Answer» B. dma
Explanation: none.
266.

The data is stored on the disk in the form of blocks called            

A. pages
B. frames
C. sectors
D. tables
Answer» C. sectors
Explanation: the data is stored on the disk in the form of a collection of blocks called as sectors.
267.

The high speed mode of operation of the USB was introduced by            

A. isa
B. usb 3.0
C. usb 2.0
D. ansi
Answer» C. usb 2.0
Explanation: the high-speed mode of operation was introduced with usb 2.0, which enabled the usb to operate at 480 mb/s.
268.

The sampling process in speaker output is a                   process.

A. asynchronous
B. synchronous
C. isochronous
D. none of the mentioned
Answer» C. isochronous
Explanation: the isochronous process means each bit of data is separated by a time interval.
269.

The I/O devices form the            of the tree structure.

A. leaves
B. subordinate roots
C. left subtrees
D. right subtrees
Answer» A. leaves
Explanation: the i/o devices form the leaves of the structure.
270.

USB is a parallel mode of transmission of data and this enables for the fast speeds of data transfers.

A. true
B. false
Answer» B. false
Explanation: the usb does a serial mode of data transfer.
271.

In USB the devices can communicate with each other.

A. true
B. false
Answer» B. false
Explanation: it allows only the host to communicate with the devices and not between themselves.
272.

The device can send a message to the host by taking part in            for the communication path.

A. arbitration
B. polling
C. prioritizing
D. none of the mentioned
Answer» B. polling
Explanation: none.
273.

When the USB is connected to a system, its root hub is connected to the

A. pci bus
B. scsi bus
C. processor bus
D. ide
Answer» C. processor bus
Explanation: the usb’s root is connected to the processor directly using the bus.
274.

The devices connected to USB is assigned a          address.

A. 9 bit
B. 16 bit
C. 4 bit
D. 7 bit
Answer» D. 7 bit
Explanation: to make it easier for recognition the devices are given 7 bit addresses.
275.

The USB address space can be shared by the user’s memory space.

A. true
B. false
Answer» B. false
Explanation: the usb memory space is not under any address spaces and cannot be accessed.
276.

Locations in the device to or from which data transfers can take place is called                   

A. end points
B. hosts
C. source
D. none of the mentioned
Answer» A. end points
Explanation: none.
277.

A USB pipe is a               channel.

A. simplex
B. half-duplex
C. full-duplex
D. both simplex and full-duplex
Answer» C. full-duplex
Explanation: this means that the pipe is bi-directional in sending messages or information.
278.

The type/s of packets sent by the USB is/are                 

A. data
B. address
C. control
D. both data and control
Answer» D. both data and control
Explanation: this means that the usb gets both data and control signals required for the transfer operation.
279.

The first field of any packet is            

A. pid
B. addr
C. endp
D. crc16
Answer» A. pid
Explanation: the pid is the field that is used to identify the device (the device id).
280.

The 4 bit PID’s are transmitted twice.

A. true
B. false
Answer» A. true
Explanation: the fields are transmitted twice, once with the true values and the second time with the complemented values.
281.

The last field in the packet is               

A. pid
B. addr
C. endp
D. crc
Answer» D. crc
Explanation: the last 5 bits of the packet is used for error checking, that is cyclic redundancy check.
282.

The CRC bits are computed based on the values of the            

A. pid
B. addr
C. endp
D. both addr and endp
Answer» D. both addr and endp
Explanation: the crc bits are calculated based on the values of the address and endp.
283.

The data packets can contain data upto               

A. 512 bytes
B. 256 bytes
C. 1024 bytes
D. 2 kb
Answer» C. 1024 bytes
Explanation: none.
284.

The            signal is used to indicate the beginning of a new frame.

A. start
B. sof
C. beg
D. none of the mentioned
Answer» B. sof
Explanation: the sof(state of frame) is used to indicate the beginning of a new frame.
285.

The SOF is transmitted every               

A. 1s
B. 5s
C. 1ms
D. 1us
Answer» C. 1ms
Explanation: none.
286.

The logic operations are simpler to implement using logic circuits.

A. true
B. false
Answer» A. true
Explanation: the logic operation includes and, or, xor etc.
287.

The logic operations are implemented using                 circuits.

A. bridge
B. logical
C. combinatorial
D. gate
Answer» C. combinatorial
Explanation: the combinatorial circuits means, using the basic universal gates.
288.

In full adders the sum circuit is implemented using                   

A. and & or gates
B. nand gate
C. xor
D. xnor
Answer» C. xor
Explanation: sum = a ^ b ^ c (‘^’ indicates xor operation).
289.

The usual implementation of the carry circuit involves                     

A. and & or gates
B. xor
C. nand
D. xnor
Answer» B. xor
Explanation: in case of full and half adders this method is used.
290.

A                 gate is used to detect the occurrence of an overflow.

A. nand
B. xor
C. xnor
D. and
Answer» B. xor
Explanation: the overflow is detected by cn^cn-1 (‘^’ indicates xor operation).
291.

The delay reduced to in the carry look ahead adder is                       

A. 5
B. 8
C. 10
D. 2n
Answer» A. 5
Explanation: none.
292.

The product of 1101 & 1011 is               

A. 10001111
B. 10101010
C. 11110000
D. 11001100
Answer» A. 10001111
Explanation: the above operation is performed using binary multiplication.
293.

The               is used to coordinate the operation of the multiplier.

A. controller
B. coordinator
C. control sequencer
D. none of the mentioned
Answer» C. control sequencer
Explanation: this performs the required sequencing of the various parts of the circuit.
294.

The multiplicand and the control signals are passed through to the n-bit adder via            

A. mux
B. demux
C. encoder
D. decoder
Answer» A. mux
Explanation: none.
295.

The method used to reduce the maximum number of summands by half is                 

A. fast multiplication
B. bit-pair recording
C. quick multiplication
D. none of the mentioned
Answer» B. bit-pair recording
Explanation: it reduces the number of summands by concatenating them.
296.

The multiplier -6(11010) is recorded as                 

A. 0-1-2
B. 0-1+1-10
C. -2-10
D. none of the mentioned
Answer» A. 0-1-2
Explanation: none.
297.

CSA stands for?

A. computer speed addition
B. carry save addition
C. computer service architecture
D. none of the mentioned
Answer» A. computer speed addition
Explanation: the csa is used to speed up the addition of multiplicands.
298.

The decimal numbers represented in the computer are called as floating point numbers, as the decimal point floats through the number.

A. true
B. false
Answer» A. true
Explanation: by doing this the computer is capable of accommodating the large float numbers also.
299.

The numbers written to the power of 10 in the representation of decimal numbers are called as            

A. height factors
B. size factors
C. scale factors
D. none of the mentioned
Answer» C. scale factors
Explanation: these are called as scale factors cause they’re responsible in determining the degree of specification of a number.
300.

If the decimal point is placed to the right of the first significant digit, then the number is called                   

A. orthogonal
B. normalized
C. determinate
D. none of the mentioned
Answer» B. normalized
Explanation: none.
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