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 None Hint 2). A 8086 is a ___ device? Microprocessor Microcontroller Processor Both a and c None Hint 3). A 8086 is of _____ bit chip? 4bit 8bit 12bit 16bit None Hint 4). A 8086 was designed by _____? Intel Phillips Hexagon AD None 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 None Hint 6). Which of the following is the data width of 8086? 12 16 18 20 None Hint 7). Which of the following is the address bit of 8086? 12 16 18 20 None Hint 8). Which of the following is the technology node of 8086? 3 micro meter 4 micro meter 5 micro meter 6 micro meter None Hint 9). ________ are the co-processors of 8086 microprocessors? Intel 8087 Intel 8089 AMD Both a and b None Hint 10). Which of the following type of socket is used in 8086? DIP 40 DIP 20 DIP 30 None Hint 11). A 8086 microprocessor is of _____ pins? 10 30 20 40 None Hint 12). Which of the following is the predecessor of 8086? Intel 8085 Intel 80186 Intel 80286 Both b and c None Hint 13). Which of the following is the successor of 8086? Intel 8085 Intel 80186 Intel 80286 Both b and c None Hint 14). Which of the following is pin 0 of 8086 processor? GND VCC CLK INTR None Hint 15). Which of the following is pin 19 of 8086 processor? GND VCC CLK INTR None Hint 16). Which of the following is pin 40 of 8086 processor? GND VCC CLK INTR None Hint 17). Which of the following is pin 18 of 8086 processor? GND VCC CLK INTR None 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 None Hint 19). Which of the following is NMI pin of 8086? Pin 15 Pin 16 Pin 17 Pin 18 None Hint 20). Which of the following is AD15 pin of 8086? Pin 39 Pin 16 Pin 17 Pin 18 None Hint 21). Which of the following is A16 pin of 8086? Pin 39 Pin 16 Pin 38 Pin 38 None Hint 22). Which of the following is A17 pin of 8086? Pin 39 Pin 16 Pin 38 Pin 37 None Hint 23). Which of the following is A18 pin of 8086? Pin 39 Pin 36 Pin 38 Pin 37 None Hint 24). Which of the following is A19 pin of 8086? Pin 39 Pin 36 Pin 38 Pin 35 None Hint 25). Which of the following is S3 pin of 8086? Pin 39 Pin 36 Pin 38 Pin 35 None 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 None Hint 27). Which of the following is S5 pin of 8086? Pin 39 Pin 36 Pin 37 Pin 35 None Hint 28). Which of the following is S6 pin of 8086? Pin 39 Pin 36 Pin 37 Pin 35 None Hint 29). Which of the following is S7 pin of 8086? Pin 39 Pin 36 Pin 34 Pin 35 None Hint 30). Which of the following is MN/MX(bar) pin of 8086? Pin 39 Pin 36 Pin 34 Pin 33 None Hint 31). Which of the following is RD (bar) pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 None Hint 32). Which of the following is HOLD signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 None Hint 33). Which of the following is HLDA signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 None Hint 34). Which of the following is RQ (bar)/GT0(bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 None Hint 35). Which of the following is RQ (bar)/GT1(bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 32 Pin 33 None Hint 36). Which of the following is LOCK (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 None Hint 37). Which of the following is LOCK (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 None Hint 38). Which of the following is WR (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 None Hint 39). Which of the following is WR (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 33 None Hint 40). Which of the following is S2 (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 28 None Hint 41). Which of the following is M/IO (bar) signal pin in 8086 processor? Pin 30 Pin 31 Pin 29 Pin 28 None Hint 42). Which of the following is M/IO (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 28 None Hint 43). Which of the following is S1 (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 28 None Hint 44). Which of the following is S0 (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 26 None Hint 45). Which of the following is DT/R (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 26 None Hint 46). Which of the following is DEN (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 29 Pin 26 None Hint 47). Which of the following is ALE (bar) signal pin in 8086 processor? Pin 27 Pin 31 Pin 25 Pin 26 None Hint 48). Which of the following is QS0 signal pin in 8086 processor? Pin 27 Pin 31 Pin 25 Pin 26 None Hint 49). Which of the following is TEST (bar) signal pin in 8086 processor? Pin 23 Pin 24 Pin 25 Pin 26 None Hint 50). Which of the following is READY signal pin in 8086 processor? Pin 23 Pin 24 Pin 25 Pin 22 None 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 None Hint 52). A 8086 has ____ bits if I/O port? 4 6 8 10 None Hint 53). A 8086 has ____ number of effective address cycles? 5 to 12 5 to 10 5 to 15 5 to 20 None Hint 54). Which of the following technology is used while fabricating 8086? HMOS CMOS NMOS PMOS None Hint 55). Which of the following technology is used while fabricating 80C86? HMOS CMOS NMOS PMOS None Hint Read more about CMOS. 56). A microprocessor is a ____ chip? Silicon Germanium Gallium Both b and c None Hint 57). A microprocessor comprises of ______ components? Memory Special purpose chips Software All the above None Hint 58). The data given to microprocessor is in ____ form? Digital Analog 0’s and 1’s Both a and c None Hint 59). Which of the following are the functions of microprocessor? Stores data Communicates with peripherals Performs computation All the above None Hint 60). Which of the following is the main function of a microprocessor? Communicate data Store data Divide data All the above None Hint 61). A 8086 type microprocessor is a _____ generation microprocessor? 1 st 2 nd 3 rd 4 th None Hint 62). Which of the following are the 3 rd generation microprocessor? 8086 Zilog Z8000 80960CA Both a and b None Hint 63). Which of the following is the fourth generation microprocessor? Motorola 88100 Intel 80960CA 8086 Both a and b None Hint 64). 8086 microprocessor was released in the year? 1976 1979 1989 1999 None Hint 65). _____ number of instructions are processed by 8086 microprocessor? 2.5 Million 2.5 Billion 2.4 Million 2.4 Billion None Hint 66). The clock speed of 80186 processors is ______? 5MHZ 6MHz 5 GHz 6GHz None Hint 67). 80286 processor has clock speed of _____? 6MHz 8MHz 10MHz 12MHz None Hint 68). ____ number of transistors are used in 80286 transistor? 134000 130000 120000 124000 None Hint Read more about Transistor. 69). A microprocessor is classified in to _____ types? 1 2 3 4 None Hint Read more about RISC and CISC. 70). A 8086 microprocessor has _____ number of major units? 1 2 3 4 None Hint 71). BIU in 8086 microprocessor stands for ____? Bus Interface Unit Bi directional Interface Unit Bus Interact Unit Both b and c None Hint 72). EU in 8086 microprocessor stands for ____? Execution Unit Extend Unit Expand Unit Both b and c None Hint 73). A BIU unit 8086 processor handles ____ components in architecture? Address bus Data bus Control bus All the above None 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 None 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 None 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 None Hint 77). A 8086 communicated data ______ way? Parallel Serial Concurrent Both a and c None Hint 78). A 8086 has ____ byte queue of pipelining? 6 5 7 8 None Hint 79). A BIU comprises of ____ number of segmented register? 1 2 3 4 None Hint 80). Each segment in BIU of 8086 is of ____ bits? 8 bits 16bits 32 bits 128 bits None Hint 81). Which of the following are BIU segments? Code segment Stack segment Data segment All the above None Hint 82). A code segment in 8086 is ____ bit? 8bit 12bit 16bit 20bit None Hint 83). A code segment holds _____ in its memory? Address of instruction Address of program Pointers All the above None Hint 84). An IP pointer contains ____ address in code segment? Data offset Offset address Code Both a and b None Hint 85). ____ segment in 8086 provides starting address of a stack? Code segment Stack segment Data segment All the above None Hint 86). Which of the following operations are used in stack segment? PUSH POP Add Both a and b None Hint 87). Which of the following 8086 segment holds content in its segment? Code segment Stack segment Data segment Extra segment None Hint 88). ____ is the register size of data segment? 8bit 12bit 16bit 20 bit None Hint 89). Which of the following 8086 segment hold additional address of starting? Code segment Stack segment Data segment Extra segment None Hint 90). An extra segment comprises of ___ strings data? Address Data Pointer Bits None Hint 91). A 6 byte based pre fetched queue in 8086 is performed during ____ operation? Decoding Executing Debugging Both a and b None Hint 92). An EU in 8086 performs _____? Decoding Execution Fetching Both a and b None Hint 93). The control unit comes in to action after ___ process? Fetching Pre-fetching Executing Decoding None Hint 94). A control unit signals ____ components of 8086? General purpose register ALU Memory Both a and b None Hint 95). ALU stands for ____? Arithmetic Logic Unit Areal Log Unit Arithmetic Lead Unit Arithmetic Lag Unit None Hint 96). The data from ALU is stored in ___? RAM ROM Register All the above None Hint 97). ____ holds the status of resultant generated from ALU? Flag Memory Register Timer None Hint 98). ____ is a temporary register holding temporary data? Opcode Operand Constant All the above None Hint 99). Identify the operand in a+b? a,b a+ +b + None Hint 100). Identify the opcode in a+b? a,b a+ +b + None Hint Time's up
