Computer Organization and Architecture Quiz | Computer Organization and Architecture MCQs and Answers

Questions
81 In a program using subroutine call instruction, it is necessary
A initialise program counter
B Clear the accumulator
C Reset the microprocessor
D Clear the instruction register

Answer: Clear the instruction register
82 A Stack-organised Computer uses instruction of
A Indirect addressing
B Two-addressing
C Zero addressing
D Index addressing

Answer: Zero addressing
83 If the main memory is of 8K bytes and the cache memory is of 2K words. It uses associative mapping. Then each word of cache memory shall be
A 11 bits
B 21 bits
C 16 bits
D 20 bits

Answer: 16 bits
84 A-Flip Flop can be converted into T-Flip Flop by using additional logic circuit
A n TQD =•
B T D =
C D = T . Q n
D n TQD =?

Answer: n TQD =?
85 Logic X-OR operation of (4ACO) H & (B53F) H results
A AACB
B 0000
C FFFF
D ABCD

Answer: FFFF
86 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: n-bit instruction register
87 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: Locality of reference
88 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: both (A) and (B)
89 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: 2’s complement method
90 PSW is saved in stack when there is a
A interrupt recognised
B execution of RST instruction
C Execution of CALL instruction
D All of these

Answer: interrupt recognised
91 The circuit converting binary data in to decimal is
A Encoder
B Multiplexer
C Decoder
D Code converter

Answer: Code converter
92 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: all input are high
93 _________ 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: PC (Program Counter)
94 Memory unit accessed by content is called
A Read only memory
B Programmable Memory
C Virtual Memory
D Associative Memory

Answer: Associative Memory
95 ‘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: Counters which indicate how long ago their associated pages have been referenced.
96 The instruction ‘ORG O’ is a
A Machine Instruction
B Pseudo instruction.
C High level instruction.
D Memory instruction.

Answer: Pseudo instruction.
97 Translation from symbolic program into Binary is done in
A Two passes.
B Directly
C Three passes.
D Four passes.

Answer: PTwo passes.
98 A floating point number that has a O in the MSB of mantissa is said to have
A Overflow
B Underflow
C Important number
D Undefined

Answer: Underflow
99 The BSA instruction is
A Branch and store accumulator
B Branch and save return address
C Branch and shift address
D Branch and show accumulator

Answer: Branch and save return address
100 MIMD stands for
A Multiple instruction multiple data
B Multiple instruction memory data
C Memory instruction multiple data
D Multiple information memory data

Answer: Multiple instruction multiple data
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