8086 Microprocessor Question & Answers January 31, 2022 By WatElectronics This article lists 100 8086 Microprocessor MCQs for engineering students. All the 8086 Microprocessor Questions and Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on 8086 Microprocessor. A microprocessor is an electronic device designed for performing data processing based on logic on an integrated circuit. It comprises of 3 main blocks as its heart for functioning namely the Arithmetic block, Logical block and control units. The data provided to the microprocessor is in digital form. They are available in different versions such as 8088, 6502, Z80, AMD Opteron 240, etc and fabricated with different bits. Among which 8086 microprocessor is a 16-bit processor designed with 40 pin DIP. 8086 has overcome the drawback of the 8085 processors in terms of address and data bits. 8086 processors have 16 bits of data and 20 bits of address and ALU unit for computation purposes. 8086 is featured with 16 registers, an internal and external bus, with 5MHz frequency, 256 based vector interrupts, and built with 29000 transistors. It comprises 2 main segments BIU and EU segment, where BIU segments compromise of registers and buses, and the EU segment comprises ALU and registers. Instruction to this processor is executed in 3 stages using the pipelining concept that is in the fetch, decode and execute stage. These processors are used in traffic lights, televisions, motors, and more. 1). 8086 is also called _____? iAPX86 iAPX86 AiPX80 iPX88 Hint 2). A 8086 is a ___ device? Microprocessor Microcontroller Processor Both a and c Hint 3). A 8086 is of _____ bit chip? 4bit 8bit 12bit 16bit Hint 4). A 8086 was designed by _____? Intel Phillips Hexagon AD Hint 5). Which of the following is the clock rate of 8086? 5MHz to 10 MHz 4MHz to 10 MHz 3MHz to 10 MHz 5MHz to 11 MHz Hint 6). Which of the following is the data width of 8086? 12 16 18 20 Hint 7). Which of the following is the address bit of 8086? 12 16 18 20 Hint 8). Which of the following is the technology node of 8086? 3 micro meter 4 micro meter 5 micro meter 6 micro meter Hint 9). ________ are the co-processors of 8086 microprocessors? Intel 8087 Intel 8089 AMD Both a and b Hint 10). Which of the following type of socket is used in 8086? DIP 40 DIP 20 DIP 30 Hint 11). A 8086 microprocessor is of _____ pins? 10 30 20 40 Hint 12). Which of the following is the predecessor of 8086? Intel 8085 Intel 80186 Intel 80286 Both b and c Hint 13). Which of the following is the successor of 8086? Intel 8085 Intel 80186 Intel 80286 Both b and c Hint 14). Which of the following is pin 0 of 8086 processor? GND VCC CLK INTR Hint 15). Which of the following is pin 19 of 8086 processor? GND VCC CLK INTR Hint 16). Which of the following is pin 40 of 8086 processor? GND VCC CLK INTR Hint 17). Which of the following is pin 18 of 8086 processor? GND VCC CLK INTR Hint 18). Which of the following is the address data bits of 8086 processor? Pin 2 to Pin 16 Pin 2 to Pin 8 Pin 2 to Pin 10 Pin 2 to Pin 12 Hint 19). Which of the following is NMI pin of 8086? Pin 15 Pin 16 Pin 17 Pin 18 Hint 20). Which of the following is AD15 pin of 8086? Pin 39 Pin 16 Pin 17 Pin 18 Hint 21). Which of the following is A16 pin of 8086? Pin 39 Pin 16 Pin 38 Pin 38 Hint 22). Which of the following is A17 pin of 8086? Pin 39 Pin 16 Pin 38 Pin 37 Hint 23). Which of the following is A18 pin of 8086? Pin 39 Pin 36 Pin 38 Pin 37 Hint 24). Which of the following is A19 pin of 8086? Pin 39 Pin 36 Pin 38 Pin 35 Hint 25). Which of the following is S3 pin of 8086? Pin 39 Pin 36 Pin 38 Pin 35 Hint 8086 Microprocessor Interview Questions and Answers 26). Which of the following is S4 pin of 8086? Pin 39 Pin 36 Pin 37 Pin 35 Hint 27). Which of the following is S5 pin of 8086? Pin 39 Pin 36 Pin 37 Pin 35 Hint 28). Which of the following is S6 pin of 8086? Pin 39 Pin 36 Pin 37 Pin 35 Hint 29). Which of the following is S7 pin of 8086? Pin 39 Pin 36 Pin 34 Pin 35 Hint 30). Which of the following is MN/MX(bar) pin of 8086? Pin 39 Pin 36 Pin 34 Pin 33 Hint 31). Which of the following is RD (bar) pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 Hint 32). Which of the following is HOLD signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 Hint 33). Which of the following is HLDA signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 Hint 34). Which of the following is RQ (bar)/GT0(bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 Hint 35). Which of the following is RQ (bar)/GT1(bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 Hint 36). Which of the following is LOCK (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 Hint 37). Which of the following is LOCK (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 Hint 38). Which of the following is WR (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 Hint 39). Which of the following is WR (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 Hint 40). Which of the following is S2 (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 28 Hint 41). Which of the following is M/IO (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 28 Hint 42). Which of the following is M/IO (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 28 Hint 43). Which of the following is S1 (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 28 Hint 44). Which of the following is S0 (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 26 Hint 45). Which of the following is DT/R (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 26 Hint 46). Which of the following is DEN (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 26 Hint 47). Which of the following is ALE (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 25 Pin 26 Hint 48). Which of the following is QS0 signal pin in 8086 processor? Pin 27 Pin 31 Pin 25 Pin 26 Hint 49). Which of the following is TEST (bar) signal pin in 8086 processor? Pin 23 Pin 24 Pin 25 Pin 26 Hint 50). Which of the following is READY signal pin in 8086 processor? Pin 23 Pin 24 Pin 25 Pin 22 Hint 8086 Microprocessor MCQs for Exams 51). Which of the following is RESET signal pin in 8086 processor? Pin 23 Pin 24 Pin 25 Pin 21 Hint 52). A 8086 has ____ bits if I/O port? 4 6 8 10 Hint 53). A 8086 has ____ number of effective address cycles? 5 to 12 5 to 10 5 to 15 5 to 20 Hint 54). Which of the following technology is used while fabricating 8086? HMOS CMOS NMOS PMOS Hint 55). Which of the following technology is used while fabricating 80C86? HMOS CMOS NMOS PMOS Hint Read more about CMOS. 56). A microprocessor is a ____ chip? Silicon Germanium Gallium Both b and c Hint 57). A microprocessor comprises of ______ components? Memory Special purpose chips Software All the above Hint 58). The data given to microprocessor is in ____ form? Digital Analog 0’s and 1’s Both a and c Hint 59). Which of the following are the functions of microprocessor? Stores data Communicates with peripherals Performs computation All the above Hint 60). Which of the following is the main function of a microprocessor? Communicate data Store data Divide data All the above Hint 61). A 8086 type microprocessor is a _____ generation microprocessor? 1 st 2 nd 3 rd 4 th Hint 62). Which of the following are the 3 rd generation microprocessor? 8086 Zilog Z8000 80960CA Both a and b Hint 63). Which of the following is the fourth generation microprocessor? Motorola 88100 Intel 80960CA 8086 Both a and b Hint 64). 8086 microprocessor was released in the year? 1976 1979 1989 1999 Hint 65). _____ number of instructions are processed by 8086 microprocessor? 2.5 Million 2.5 Billion 2.4 Million 2.4 Billion Hint 66). The clock speed of 80186 processors is ______? 5MHZ 6MHz 5 GHz 6GHz Hint 67). 80286 processor has clock speed of _____? 6MHz 8MHz 10MHz 12MHz Hint 68). ____ number of transistors are used in 80286 transistor? 134000 130000 120000 124000 Hint Read more about Transistor. 69). A microprocessor is classified in to _____ types? 1 2 3 4 Hint Read more about RISC and CISC. 70). A 8086 microprocessor has _____ number of major units? 1 2 3 4 Hint 71). BIU in 8086 microprocessor stands for ____? Bus Interface Unit Bi directional Interface Unit Bus Interact Unit Both b and c Hint 72). EU in 8086 microprocessor stands for ____? Execution Unit Extend Unit Expand Unit Both b and c Hint 73). A BIU unit 8086 processor handles ____ components in architecture? Address bus Data bus Control bus All the above Hint 74). Which of the following is the first function of BIU in 8086? Fetching instructions from memory Finding physical address Managing pre fetched queue Storing data Hint 75). Which of the following is the second function of BIU in 8086? Fetching instructions from memory Finding physical address Managing pre fetched queue Storing data Hint 8086 Microprocessor Quiz Questions and Answers. 76). Which of the following is the third function of BIU in 8086? Fetching instructions from memory Finding physical address Managing pre fetched queue Storing data Hint 77). A 8086 communicated data ______ way? Parallel Serial Concurrent Both a and c Hint 78). A 8086 has ____ byte queue of pipelining? 6 5 7 8 Hint 79). A BIU comprises of ____ number of segmented register? 1 2 3 4 Hint 80). Each segment in BIU of 8086 is of ____ bits? 8 bits 16bits 32 bits 128 bits Hint 81). Which of the following are BIU segments? Code segment Stack segment Data segment All the above Hint 82). A code segment in 8086 is ____ bit? 8bit 12bit 16bit 20bit Hint 83). A code segment holds _____ in its memory? Address of instruction Address of program Pointers All the above Hint 84). An IP pointer contains ____ address in code segment? Data offset Offset address Code Both a and b Hint 85). ____ segment in 8086 provides starting address of a stack? Code segment Stack segment Data segment All the above Hint 86). Which of the following operations are used in stack segment? PUSH POP Add Both a and b Hint 87). Which of the following 8086 segment holds content in its segment? Code segment Stack segment Data segment Extra segment Hint 88). ____ is the register size of data segment? 8bit 12bit 16bit 20 bit Hint 89). Which of the following 8086 segment hold additional address of starting? Code segment Stack segment Data segment Extra segment Hint 90). An extra segment comprises of ___ strings data? Address Data Pointer Bits Hint 91). A 6 byte based pre fetched queue in 8086 is performed during ____ operation? Decoding Executing Debugging Both a and b Hint 92). An EU in 8086 performs _____? Decoding Execution Fetching Both a and b Hint 93). The control unit comes in to action after ___ process? Fetching Pre-fetching Executing Decoding Hint 94). A control unit signals ____ components of 8086? General purpose register ALU Memory Both a and b Hint 95). ALU stands for ____? Arithmetic Logic Unit Areal Log Unit Arithmetic Lead Unit Arithmetic Lag Unit Hint 96). The data from ALU is stored in ___? RAM ROM Register All the above Hint 97). ____ holds the status of resultant generated from ALU? Flag Memory Register Timer Hint 98). ____ is a temporary register holding temporary data? Opcode Operand Constant All the above Hint 99). Identify the operand in a+b? a,b a+ +b + Hint 100). Identify the opcode in a+b? a,b a+ +b + Hint Time is Up! 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