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Q1. 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
Q2. 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
Q3. Status bit is also called
(A) Binary bit
(B) Flag bit
(C) Signed bit
(D) Unsigned bit
Answer: (B) Flag bit
Q4. Which of the following are not a machine instructions?
(A) MOV
(B) ORG
(C) END
(D) Both (b) & (c)
Answer: (D) Both (b) & (c)
Q5. A stack organized computer has
(A) Three-address Instruction
(B) Two-address Instruction
(C) One-address Instruction
(D) Zero-address Instruction
Answer: (D) Zero-address Instruction
Q6. The communication between the components in a microcomputer takes place via the address and
(A) I/O bus
(B) Data bus
(C) Address bus
(D) Control lines
Answer: (B) Data bus
Q7. 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
Q8. 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
Q9. _ 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)
Q10. An address in main memory is called
(A) Physical address
(B) Logical address
(C) Memory address
(D) Word address
Answer:(A) Physical address
Q11. In Assembly language programming, minimum number of operands required for an instruction is/are
(A) Zero
(B) One
(C) Two
(D) Both (b) & (c)
Answer:(A) Zero
Q12. A Program Counter contains a number 825 and address part of the instruction contains the number 24. The effective address in the relative address mode, when an instruction is read from the memory is
(A) 849
(B) 850
(C) 801
(D) 802
Answer: (B) 850
Q13. A register capable of shifting its binary information either to the right or the left is called a
(A) Parallel register
(B) Serial register
(C) Shift register
(D) Storage register
Answer: (C) Shift register
Q14. 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
Q15. 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
Computer Organization and Architecture MCQ – All Set
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