MCQOPTIONS
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MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Organization and Architecture Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In an Intel 8085A, which is the first machine cycle of an instruction? |
| A. | An op-code fetch cycle |
| B. | A memory read cycle |
| C. | A memory write cycle |
| D. | An I/O read cycle |
| Answer» B. A memory read cycle | |
| 2. |
The number of output pins in 8085 microprocessors are |
| A. | 40 |
| B. | 27 |
| C. | 21 |
| D. | 19 |
| Answer» B. 27 | |
| 3. |
In 8085 name of the 16 bit registers is |
| A. | Stack pointer |
| B. | Program counter |
| C. | Both A and B |
| D. | None of these |
| Answer» D. None of these | |
| 4. |
Which of the following instruction is not possible in 8085? |
| A. | POP PSW |
| B. | POP B |
| C. | POP D |
| D. | POP 30 H |
| Answer» E. | |
| 5. |
How many T-states are required for execution of OUT 80H instruction? |
| A. | 10 |
| B. | 13 |
| C. | 16 |
| D. | 7 |
| Answer» B. 13 | |
| 6. |
Which instruction is required to rotate the content of accumulator one bit right along with carry? |
| A. | RLC |
| B. | RAL |
| C. | RRC |
| D. | RAR |
| Answer» E. | |
| 7. |
Which interrupt has the highest priority? |
| A. | INTR |
| B. | TRAP |
| C. | RST6.5 |
| D. | RST6.6 |
| Answer» D. RST6.6 | |
| 8. |
In which year, 8088 microprocessor was announced? |
| A. | 1979 |
| B. | 1988 |
| C. | 1999 |
| D. | 2000 |
| Answer» B. 1988 | |
| 9. |
What is the RST for the TRAP? |
| A. | RST5.5 |
| B. | RST4.5 |
| C. | RST4 |
| D. | RST3 |
| Answer» C. RST4 | |
| 10. |
Which interrupt is not level sensitive in 8085? |
| A. | RST 6.5 |
| B. | RST 7.5 |
| C. | RST 5.5 |
| D. | RST 4.5 |
| Answer» C. RST 5.5 | |
| 11. |
What are software interrupts? |
| A. | RST 0-7 |
| B. | RST 5.5 - 7.5 |
| C. | INTR, TRAP |
| D. | RST 4.4 - 6.4 |
| Answer» B. RST 5.5 - 7.5 | |
| 12. |
Which stack is used in 8085 ? |
| A. | FIFO |
| B. | LIFO |
| C. | FILO |
| D. | LILO |
| Answer» C. FILO | |
| 13. |
Why 8085 processor is called an 8 bit processor? |
| A. | Because 8085 processor has 8 bit ALU |
| B. | Because 8085 processor has 8 bit data bus |
| C. | Because 8085 processor has 16 bit data bus |
| D. | Because 8085 processor has 16 bit address bus |
| Answer» B. Because 8085 processor has 8 bit data bus | |
| 14. |
What is SIM in context of microprocessor ? |
| A. | Select Interrupt Mask |
| B. | Sorting Interrupt Mask |
| C. | Set Interrupt Mask |
| D. | Set Integer Mask |
| Answer» D. Set Integer Mask | |
| 15. |
What is meant by maskable interrupts? |
| A. | An interrupt which can never be turned off |
| B. | An interrupt that can be turned off by the programmer |
| C. | An interrupt which can never be turned on |
| D. | An interrupt which can never be turned on or off |
| Answer» C. An interrupt which can never be turned on | |
| 16. |
In 8086, Example for Non maskable interrupts are ________. |
| A. | Trap |
| B. | Rst6.5 |
| C. | Intr |
| D. | Rst6.6 |
| Answer» B. Rst6.5 | |
| 17. |
In 8085 microprocessor address line for RST3 is ? |
| A. | 0020H |
| B. | 0028H |
| C. | 0018H |
| D. | 0019H |
| Answer» D. 0019H | |
| 18. |
In 8086 the overflow flag is set when _____________. |
| A. | The sum is more than 16 bits |
| B. | Signed numbers go out of their range after an arithmetic operation |
| C. | Carry and sign flags are set |
| D. | Subtraction |
| Answer» C. Carry and sign flags are set | |
| 19. |
In 8086 microprocessor one of the following statements is not true? |
| A. | Coprocessor is interfaced in max mode |
| B. | Coprocessor is interfaced in min mode |
| C. | I/o can be interfaced in max / min mode |
| D. | Supports pipelining |
| Answer» C. I/o can be interfaced in max / min mode | |
| 20. |
In 8086 microprocessor the following has the highest priority among all type interrupts? |
| A. | NMI |
| B. | DIV 0 |
| C. | TYPE 255 |
| D. | OVER FLOW |
| Answer» B. DIV 0 | |
| 21. |
The frequency of the driving network connected between pins 1 and 2 of 8085 microprocessor is |
| A. | Twice the desired frequency |
| B. | Equal to the desired frequency |
| C. | Four times the desired frequency |
| D. | None of the above |
| Answer» B. Equal to the desired frequency | |
| 22. |
Temporary registers in 8085 are |
| A. | B and C |
| B. | D and E |
| C. | H and L |
| D. | W and Z |
| Answer» E. | |
| 23. |
Register pair used to indicate memory |
| A. | B and C |
| B. | D and E |
| C. | H and L |
| D. | W and Z |
| Answer» D. W and Z | |
| 24. |
A sequence of two registers that multiplies the content of DE register pair by two and stores the result in HL register pair (in 8085 assembly language) is |
| A. | XCHG & DAD B |
| B. | XTHL & DAD H |
| C. | PCHL & DAD D |
| D. | XCHG & DAD H |
| Answer» E. | |
| 25. |
The Intel 8086 microprocessor is a _______ processor. |
| A. | 8 bit |
| B. | 16 bit |
| C. | 32 bit |
| D. | 4 bit |
| Answer» C. 32 bit | |
| 26. |
The 16 bit flag of 8086 microprocessor is responsible to indicate ___________. |
| A. | The condition of result of ALU operation |
| B. | The condition of memory |
| C. | The result of addition |
| D. | The result of subtraction |
| Answer» B. The condition of memory | |
| 27. |
The register AX is formed by grouping ________. |
| A. | AH & AL |
| B. | BH & BL |
| C. | CH & CL |
| D. | DH & DL |
| Answer» B. BH & BL | |
| 28. |
In which year, 8086 microprocessor was introduced? |
| A. | 1978 |
| B. | 1979 |
| C. | 1977 |
| D. | 1981 |
| Answer» B. 1979 | |
| 29. |
8088 microprocessor differs with 8086 microprocessor in _______. |
| A. | Data width on the output |
| B. | Address capability |
| C. | Support of coprocessor |
| D. | Support of MAX / MIN mode |
| Answer» B. Address capability | |
| 30. |
Address line for TRAP is ? |
| A. | 0023H |
| B. | 0024H |
| C. | 0033H |
| D. | 0099H |
| Answer» C. 0033H | |
| 31. |
8085 microprocessor was introduced in __________. |
| A. | 1971 |
| B. | 1976 |
| C. | 1972 |
| D. | 1978 |
| Answer» C. 1972 | |
| 32. |
The address / data bus in 8085 is __________. |
| A. | Multiplexed |
| B. | Demultiplexed |
| C. | Decoded |
| D. | Encoded |
| Answer» B. Demultiplexed | |
| 33. |
In 8085 name the 16 bit registers? |
| A. | Stack pointer |
| B. | Program counter |
| C. | Both a and b |
| D. | None of these |
| Answer» D. None of these | |
| 34. |
Which stack is used in 8085? |
| A. | FIFO |
| B. | LIFO |
| C. | FILO |
| D. | None of these |
| Answer» C. FILO | |
| 35. |
RIM is used to check whether, ______ |
| A. | The write operation is done or not |
| B. | The interrupt is Masked or not |
| C. | A & b |
| D. | None of these |
| Answer» C. A & b | |
| 36. |
8088 microprocessor has |
| A. | 16 bit data bus |
| B. | 4 byte pre-fetch queue |
| C. | 6 byte pre-fetch queue |
| D. | 16 bit address bus |
| Answer» E. | |
| 37. |
By what factor does the 8284A clock generator divide the crystal oscillator s outputfrequency? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |