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

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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
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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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