170+ Computer System Architecture Solved MCQs

101.

Translation from symbolic program into Binary is done in_____.

A. . two passes.
B. . directly
C. . three passes.
D. . four passes.
Answer» A. . two passes.
102.

The instruction ‘ORG O’ is a______.

A. . machine instruction.
B. . pseudo instruction.
C. . high level instruction.
D. . memory instruction.
Answer» B. . pseudo instruction.
103.

‘Aging registers’ are _______.

A. . counters which indicate how long ago their associated pages have been referenced.
B. . registers which keep track of when the program was last accessed.
C. . counters to keep track of last accessed instruction.
D. . counters to keep track of the latest data structures referred.
Answer» A. . counters which indicate how long ago their associated pages have been referenced.
104.

Memory unit accessed by content is called______.

A. . read only memory
B. . programmable memory
C. . virtual memory
D. . associative memory
Answer» D. . associative memory
105.

_________ register keeps tracks of the instructions stored in program stored in memory.

A. . ar (address register)
B. . xr (index register)
C. . pc (program counter)
D. . ac (accumulator)
Answer» C. . pc (program counter)
106.

n bits in operation code imply that there are ___________ possible distinct operators.

A. . 2n
B. . 2n
C. . n/2
D. . n2
Answer» B. . 2n
107.

A three input NOR gate gives logic high output only when_____.

A. . one input is high
B. . one input is low
C. . two input are low
D. . all input are high
Answer» D. . all input are high
108.

The circuit converting binary data in to decimal is_____.

A. . encoder
B. . multiplexer
C. . decoder
D. .code converter
Answer» D. .code converter
109.

The multiplicand register & multiplier register of a hardware circuit implementing booth’s algorithm have (11101) & (1100). The result shall be ______.

A. . (812)10
B. . (-12)10
C. . (12)10
D. . (-812)10
Answer» A. . (812)10
110.

PSW is saved in stack when there is a _____.

A. . interrupt recognized
B. . execution of rst instruction
C. . execution of call instruction
D. . all of these
Answer» A. . interrupt recognized
111.

In computers, subtraction is carried out generally by____.

A. . 1’s complement method
B. . 2’s complement method
C. . signed magnitude method
D. . bcd subtraction method
Answer» B. . 2’s complement method
112.

The main memory in a Personal Computer (PC) is made of_____.

A. . cache memory.
B. . static ram
C. . dynamic ram
D. . both (a).and (b).
Answer» D. . both (a).and (b).
113.

Cache memory works on the principle of_____.

A. . locality of data
B. . locality of memory
C. . locality of reference
D. . locality of reference & memory
Answer» C. . locality of reference
114.

An n-bit microprocessor has_____.

A. . n-bit program counter
B. . n-bit address register
C. . n-bit alu
D. . n-bit instruction register
Answer» D. . n-bit instruction register
115.

When CPU is executing a Program that is part of the Operating System, it is said to be in _____.

A. . interrupt mode
B. . system mode
C. . half mode
D. . simplex mode
Answer» B. . system mode
116.

Logic X-OR operation of (4ACO)H& (B53F)H results _____.

A. . aacb
B. . 0000
C. . ffff
D. . abcd
Answer» C. . ffff
117.

Then each word of cache memory shall be_____.

A. . 11 bits
B. . 21 bits
C. . 16 bits
D. . 20 bits
Answer» C. . 16 bits
118.

A Stack-organised Computer uses instruction of _____.

A. . indirect addressing
B. . two-addressing
C. . zero addressing
D. . index addressing
Answer» C. . zero addressing
119.

In a program using subroutine call instruction, it is necessary______.

A. . initialize program counter
B. . clear the accumulator
C. . reset the microprocessor
D. . clear the instruction register
Answer» D. . clear the instruction register
120.

Virtual memory consists of _______.

A. . static ram
B. . dynamic ram
C. . magnetic memory
D. . none of these
Answer» A. . static ram
121.

In signed-magnitude binary division, if the dividend is (11100)2 and divisor is (10011)2 then the result is ______.

A. . (00100)2
B. . (10100)2
C. . (11001)2
D. . (01100)2
Answer» B. . (10100)2
122.

Generally Dynamic RAM is used as main memory in a computer system as it______.

A. . consumes less power
B. . has higher speed
C. . has lower cell density
D. . needs refreshing circuitry
Answer» B. . has higher speed
123.

Write Through technique is used in which memory for updating the data_____.

A. . virtual memory
B. . main memory
C. . auxiliary memory
D. . cache memory
Answer» D. . cache memory
124.

Cache memory acts between_______.

A. . cpu and ram
B. . ram and rom
C. . cpu and hard disk
D. . none of these
Answer» A. . cpu and ram
125.

The circuit used to store one bit of data is known as ______.

A. . encoder
B. . or gate
C. . flip flop
D. . decoder
Answer» C. . flip flop
126.

Von Neumann architecture is ______.

A. . sisd
B. . simd
C. . mimd
D. . misd
Answer» A. . sisd
127.

In a vectored interrupt.

A. . the branch address is assigned to a fixed location in memory.
B. . the interrupting source supplies the branch information to the processor through an interrupt vector.
C. . the branch address is obtained from a register in the processor
D. . none of the above
Answer» B. . the interrupting source supplies the branch information to the processor through an interrupt vector.
128.

. In a memory-mapped I/O system, which of the following will not be there?

A. . lda
B. . in
C. . add
D. . out
Answer» A. . lda
129.

If memory access takes 20 ns with cache and 110 ns without it, then the ratio (cache uses a 10 ns memory) is _____.

A. . 93%
B. . 90%
C. . 88%
D. . 87%
Answer» B. . 90%
130.

The addressing mode used in an instruction of the form ADD X Y, is _____.

A. . absolute
B. . indirect
C. . index
D. . none of these
Answer» C. . index
131.

_________ register keeps track of the instructions stored in program stored in memory.

A. . ar (address register)
B. . xr (index register)
C. . pc (program counter)
D. . ac (accumulator)
Answer» C. . pc (program counter)
132.

The idea of cache memory is based ______.

A. . on the property of locality of reference
B. . on the heuristic 90-10 rule
C. . on the fact that references generally tend to cluster
D. . all of the above
Answer» A. . on the property of locality of reference
133.

Which of the following is not a weighted code?

A. . decimal number system
B. . excess 3-cod
C. . binary number system
D. . none of these
Answer» B. . excess 3-cod
134.

The average time required to reach a storage location in memory and obtain its contents is called the _____.

A. . seek time
B. . turnaround time
C. . access time
D. . transfer time
Answer» C. . access time
135.

(2FAOC)16 is equivalent to _____.

A. . (195 084)10
B. . (001011111010 0000 1100)2
C. . both a.and (b)
D. . none of these
Answer» B. . (001011111010 0000 1100)2
136.

The circuit used to store one bit of data is known as_______.

A. . register
B. . encoder
C. . decoder
D. . flip flop
Answer» D. . flip flop
137.

. Computers use addressing mode techniques for ____________.

A. . giving programming versatility to the user by providing facilities as pointers to memory counters for loop control
B. . to reduce no. of bits in the field of instruction
C. . specifying rules for modifying or interpreting address field of the instruction
D. . all the above
Answer» D. . all the above
138.

What characteristic of RAM memory makes it not suitable for permanent storage?

A. . too slow
B. . unreliable
C. . it is volatile
D. . too bulky
Answer» C. . it is volatile
139.

rotational latency, and transfer time. Rotational latency refers to ______.

A. . the time its takes for the platter to make a full rotation
B. . the time it takes for the read-write head to move into position over the appropriate track
C. . the time it takes for the platter to rotate the correct sector under the head
D. . none of the above
Answer» A. . the time its takes for the platter to make a full rotation
140.

In computers, subtraction is generally carried out by ______.

A. . 9’s complement
B. . 10’s complement
C. . 1’s complement
D. . 2’s complement
Answer» D. . 2’s complement
141.

Assembly language ________.

A. . uses alphabetic codes in place of binary numbers used in machine language
B. . is the easiest language to write programs
C. . need not be translated into machine language
D. . none of these
Answer» A. . uses alphabetic codes in place of binary numbers used in machine language
142.

the number of cycles required for transfer stayed the same what would the bandwidth of the bus?

A. . 1 megabyte/sec
B. . 4 megabytes/sec
C. . 8 megabytes/sec
D. . 2 megabytes/sec
Answer» D. . 2 megabytes/sec
143.

Floating point representation is used to store ______.

A. . boolean values
B. . whole numbers
C. . real integers
D. . integers
Answer» C. . real integers
144.

SIMD represents an organization that ______________.

A. . refers to a computer system capable of processing several programs at the same time.
B. . represents organization of single computer containing a control unit, processor unit and a memory unit.
C. . includes many processing units under the supervision of a common control unit
D. . none of the above.
Answer» C. . includes many processing units under the supervision of a common control unit
145.

In Reverse Polish notation, expression A*B+C*D is written as

A. . ab*cd*+
B. . a*bcd*+
C. . ab*cd+*
D. . a*b*cd+
Answer» A. . ab*cd*+
146.

Processors of all computers, whether micro, mini or mainframe must have

A. . alu
B. . primary storage
C. . control unit
D. . all of above
Answer» B. . primary storage
147.

What is the control unit’s function in the CPU?

A. . to transfer data to primary storage
B. . to store program instruction
C. . to perform logic operations
D. . to decode program instruction
Answer» C. . to perform logic operations
148.

What is meant by a dedicated computer?

A. . which is used by one person only
B. . which is assigned to one and only one task
C. . which does one kind of software
D. . which is meant for application software only
Answer» D. . which is meant for application software only
149.

Which of the following code is used in present day computing was developed by IBM corporation?

A. . ascii
B. . hollerith code
C. . baudot code
D. . ebcdic code
Answer» D. . ebcdic code
150.

When a subroutine is called, the address of the instruction following the CALL instructions stored in/on the

A. . stack pointer
B. . accumulator
C. . program counter
D. . stack
Answer» D. . stack
151.

A microprogram written as string of 0’s and 1’s is a

A. . symbolic microinstruction
B. . binary microinstruction
C. . symbolic microprogram
D. . binary microprogram
Answer» D. . binary microprogram
152.

Interrupts which are initiated by an instruction are

A. . internal
B. . external
C. . hardware
D. . software
Answer» B. . external
153.

Memory access in RISC architecture is limited to instructions

A. . call and ret
B. . push and pop
C. . sta and lda
D. . mov and jmp
Answer» C. . sta and lda
154.

A collection of lines that connects several devices is called …………..

A. . bus
B. . peripheral connection wires
C. . both a and b
D. . internal wires
Answer» A. . bus
155.

A complete microcomputer system consist of ………..

A. . microprocessor
B. . memory
C. . peripheral equipment
D. . all of the above
Answer» D. . all of the above
156.

PC Program Counter is also called ……………….

A. . instruction pointer
B. . memory pointer
C. . data counter
D. . file pointer
Answer» A. . instruction pointer
157.

In a single byte how many bits will be there?

A. . 8
B. . 16
C. . 4
D. . 32
Answer» A. . 8
158.

CPU does not perform the operation ………………

A. . data transfer
B. . logic operation
C. . arithmetic operation
D. . all of the above
Answer» A. . data transfer
159.

The access time of memory is …………… the time required for performing any single CPU operation.

A. . longer than
B. . shorter than
C. . negligible than
D. . same as
Answer» A. . longer than
160.

Memory address refers to the successive memory words and the machine is called as …………

A. . word addressable
B. . byte addressable
C. . bit addressable
D. . tera byte addressable
Answer» A. . word addressable
161.

A microprogram written as string of 0’s and 1’s is a ………….

A. . symbolic microinstruction
B. . binary microinstruction
C. . symbolic microinstruction
D. . binary microprogram
Answer» D. . binary microprogram
162.

A pipeline is like ………………..

A. . an automobile assembly line
B. . house pipeline
C. . both a and b
D. . a gas line
Answer» A. . an automobile assembly line
163.

Data hazards occur when ……

A. . greater performance loss
B. . pipeline changes the order of read/write access to operands
C. . some functional unit is not fully pipelined
D. . machine size is limited
Answer» B. . pipeline changes the order of read/write access to operands
164.

Where does a computer add and compare data?

A. . hard disk
B. . floppy disk
C. . cpu chip
D. . memory chip
Answer» C. . cpu chip
165.

the next instruction is located?

A. . memory address register
B. . memory data register
C. . instruction register
D. . program register
Answer» D. . program register
166.

A complete microcomputer system consists of

A. . microprocessor
B. . memory
C. . peripheral equipment
D. . all of above
Answer» D. . all of above
167.

Pipelining strategy is called implement

A. . instruction execution
B. . instruction prefetch
C. . instruction decoding
D. . instruction manipulation
Answer» C. . instruction decoding
168.

A stack is

A. . an 8-bit register in the microprocessor
B. . a 16-bit register in the microprocessor
C. . a set of memory locations in r/wm reserved for storing information temporarily during the execution of computer
D. . a 16-bit memory address stored in the program counter
Answer» A. . an 8-bit register in the microprocessor
169.

A stack pointer is

A. . a 16-bit register in the microprocessor that indicate the beginning of the stack memory.
B. . a register that decodes and executes 16-bit arithmetic expression.
C. . the first memory location where a subroutine address is stored.
D. . a register in which flag bits are stored
Answer» A. . a 16-bit register in the microprocessor that indicate the beginning of the stack memory.
170.

The branch logic that provides decision making capabilities in the control unit is known as

A. . controlled transfer
B. . conditional transfer
C. . unconditional transfer
D. . none of above
Answer» C. . unconditional transfer
171.

A time sharing system imply

A. . more than one processor in the system
B. . more than one program in memory
C. . more than one memory in the system
D. . none of above
Answer» B. . more than one program in memory
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