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Microprocessor Question & Answers

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This article lists 100+  Microprocessor MCQs for engineering students. All the Microprocessor  Questions & Answers given below include a hint and wherever possible link to the relevant topic. This is helpful for the users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the Microprocessor topic.

The heart of a computer is a microprocessor, that is integrated on a chip with a large number of electronic components like transistors, resistors, crystals, etc. the basic components of a microprocessor are ALU its function is to perform arithmetic and logical operations on data that received from memory or input from a user, register array contains registers like B, C, D, E and a control unit that controls data flow and instructions. It provides different features like small chip size, cost-effective process, more versatile process, more reliable & consumes less power.

Generally, these processors are microprocessors is classified based on the factors like size of data and address bus, RISC, and CISCC architecture. They are 3 types of a microprocessor like Complex instruction set computer processor, reduced instruction set computer processor, and special processors. An example of microprocessors is the 8085 and 8086 processors. Some of the applications of microprocessors are ovens, washing machines, music systems, and mobile phones.

1). Microprocessor is a unit that controls ___________.
HintA microprocessor is a unit that controls a Microcomputer, that is integrated on a chip, which performs all arithmetic and logical unit operations and also establishes communication between the connected devices.
Read more about Microprocessor.
2). ALU stands for ________.
HintALU stands for Arithmetic logical unit.
3). What is the function of ALU?
HintALU Used to perform arithmetic and logical operations on data that received from memory or input from a user.
4). Which of the following are the components of a microprocessor?
HintThe microprocessor has 3 main components, they are ALU, register array, and a control unit.
5). Which of the following statement is related to the register array?
HintA central processing unit that consists of an array of processor registers is a register file, in a microprocessor, a register array consists of an accumulator and registers like B, C, D, E.
6). Which of the following statement is related to Accumulator?
HintAn accumulator is a storage element, that not only performs ALU operations but also complementing operations and decimal operations.
7). The function of the control unit is _________.
HintThe function of the control unit is It controls data flow and instructions in a computer and It decides how computer memory, ALU unit, the input-output device should respond to the processor's instructions.
Read more about Control Unit.
8). Which of the following sequence that a microprocessor follows?
HintA microprocessor has 3 sequence that is It fetches instruction firstly, next it decodes the instruction and, finally, it executes the instruction.
9). Initially the microprocessors stores instructions in ______ order in a memory.
HintInitially microprocessors stores instructions in a sequential manner in memory.
10). Instructions in a microprocessor, are fetched from _________.
HintInstructions in a microprocessor, are fetched from the memory unit.
11). Microprocessor continues to execute the instruction until it reaches _______ instruction.
HintThe microprocessor continues to execute the instruction until it reaches stop Instruction.
12). When a microprocessor reaches a stop instruction it responds back in _______ format to the ports output.
HintWhen a microprocessor reaches a stop instruction it responds back in a binary format that is in 0’s and 1’s the port's output.
13). Microprocessor understands a set of instructions called ________.
HintMicroprocessor understands a set of instructions called an instruction set.
14). A single instruction processes number of bits in a processor it is called ______.
HintA single instruction processes number of bits in a processor it is called bandwidth.
15). A number of operations processes per second by a processor is called ______.
HintThe number of operations processes per second by a processor is called clock speed.
16). Word length depends on _______.
HintWord length depends on certain factors namely Internal bus width, Registers, and ALU.
17). A microprocessor with 8-bit can process ______ bits of data at a time.
HintA microprocessor with 8-bit processes data of 8 bits at a time.
18). Word length in a microcomputer ranges from ______.
HintWord length in a microcomputer ranges from 4bits to 64 bits.
19). Which of the following are the data types used in a microprocessor?
HintThe data types used in a microprocessor are binary numbers, BCD numbers, ASCII numbers, unsigned and signed numbers.
20). Binary numbers are represented in which of the following.
HintBinary numbers are represented in 0’s and 1’s.
21). BCD number is represented in which of the following.
HintBCD number is represented as 4 bits like example BCD value of “8” is written as = 1000 (8,4,2,1).
22). ASCII stands for _______.
HintASCII stands for American standard code for information interchange.
Read more about ASCII.
23). ASCII code can represent the text of which of the following data.
HintASCII code can represent the text of computers, telecommunication, and other electronic devices.
24). Signed number is represented in which of the following.
HintA signed number is represented as a positive or a negative number. Example : +1 and -1.
25). Un-Signed number is represented in which of the following?
HintAn Un-Signed number is represented without a sign before a number, for example, 0.
26). Which of the following are the features of a microprocessor?
HintThe features of a microprocessor are it has a small chip size, it is a cost-effective process, and is a more versatile process, more reliable, consumes less power.
27). A microprocessor is made up of _________.
HintA microprocessor is made up of silicon, quartz, metals, and other chemicals.
28). How many months does it take for a microprocessor to build?
HintIt takes 2 months for a microprocessor to build.
29). A microprocessor is classified based on which of the following factors.
HintA microprocessor is classified based on the factors like size of data and address bus, RISC, and CISCC architecture.
30). RISC type processor stands for _________.
HintRISC type processor stands for reduced instruction set computer processor.

Microprocessor MCQs with Answers

31). CISC type Processor stands for _______.
HintCISC type Processor stands for Complex instruction set computer processor.
32). Microprocessors are of how many types?
HintMicroprocessors are of 3 types namely CISC type Processor - Complex instruction set computer processor, RISC type processor -reduced instruction set computer processor and special processors.
Read more about RISC and CISC Processors.
33). What is the main purpose of the RISC type processor?
HintThe main purpose of the RISC type processor is that it reduces execution time and consumes only a single clock cycle.
34). Does the RISC type processor consumes more RAM memory to store instruction?
HintYes, RISC type processor consumes more RAM memory to a store instruction, where efficiency is reduced.
35). Choose the examples of RISC type processors.
HintExamples of RISC type processors are Power PC: 601, DEC Alpha: 210642, and MIPS: TS(R10000) RISC type Processor.
36). RISC type processor uses _______ set of instruction set.
HintRISC type processor uses a highly optimized set of instruction set.
37). RISC type processor architecture consists of which of the following components.
HintRISC-type processor architecture consists of a hardwired control unit, instruction cache, data cache, data path, and main memory.
38). RISC type processor consists of _______ instruction set.
HintRISC type processor consists of a simple instruction set.
39). Does the RISC type processor supports different data types?
HintYes, the RISC type processor supports different data types.
40). RISC type processor uses _____ types of addressing modes?
HintRISC type processor uses a simple type of addressing modes.
41). RISC type processor uses _____ length instruction for pipelining.
HintRISC type processor uses fixed-length instruction for pipelining.
42). RISC type processor uses ______ cycle execution time.
HintRISC type processor uses one cycle execution time.
43). Which of the following instruction in the RISC type processor access memory location?
HintSTORE and LOAD instruction in the RISC type processor is used to access a memory location.
44). RISC type processor contains ______ number of processors.
HintRISC type processor contains a many number of processors.
45). RISC type processor contains _______ number of transistors.
HintA RISC-type processor contains a few transistors.
46). CISC type processor is designed` to _______ number of instruction per program.
HintCISC type processor is designed to minimize the number of instruction per program.
47). What is the function of a compiler?
HintA compiler translates high-level language into machine code or assembly-level language.
48). CISC type processor uses _____ amount of RAM.
HintThe CISC-type processor uses a small amount of RAM.
49). Which of the following is the CISC type processor?
HintThe CISC type processor is IBM 370/168, VAX 11/780, and Intel 80486.
50). Which of the following are the components of a CISC type processor?
HintThe components of a CISC type processor are control unit, cache, main memory, microprogram control memory, instruction, and data path.
51). CISC type processor has ______ type of addressing modes.
HintCISC type processor has various types of addressing modes.
52). CISC type processor uses _______ number of instructions.
HintCISC type processor uses a large number of instructions.
53). In a CISC type processor, instruction decoding logic is _______.
HintIn a CISC-type processor, instruction decoding logic is complex.
54). How many instructions are required to support multiple addressing modes?
HintOnly a single, instruction is required to support multiple addressing modes.
55). What is the purpose of designing a special processor?
HintThe purpose of designing a special processor is for a special purpose.
56). Which of the following are types of special processors?
HintSpecial processors are co-processor, math processor, input-output processor, DSP processor, and transputer.
57). Which of the following are the examples of math coprocessor?
HintThe examples of math coprocessors are 8087- used with 8086, 80287 used with 80286, and 80387 used with 80386.
58). A coprocessor handles a particular function ____ than a microprocessor.
HintA coprocessor handles a particular function faster than a microprocessor.
59). Which of the following are the examples of input/output processors?
HintExamples of input/output processors are DMA processors, Keyboard/ mouse controllers, and graphic display controllers.
60). DMA stands for?
HintDMA stands for direct memory access.

Microprocessor Interview Questions & Answers

61). Which of the following is the special feature of the IO processor?
HintThe special feature of the IO processor is that it has its own local memory that controls I/O devices with min CPU involvement.
62). The word transputer is also called _______.
HintThe word transputer is also called transistor computer.
63). A transputer has ________ memory.
HintA transputer has its own local Memory.
64). A transputer was designed in ________ year.
HintA transputer was designed in the year 1980 by Inmo.
65). Which of the following statement matches the transputer?
HintTransputer can be used as a single processor, also it can connect external links which thereby reduces the system cost and improves the performance.
66). Which of the following are the examples of transputers?
HintExamples of transputers are 16bit T212, 32 bit T425, and T800.
67). DSP in DSP processor stands for ________.
HintDSP in DSP processor stands for a digital signal processor.
68). DSP processor processes _________.
HintDSP processor processes analog signal to digital signal.
69). ADC process in a DSP processor is done by _______.
HintADC process in a DSP processor is done by voltage level sampling at periodic intervals of time and converting this voltage level at that instant into digital form.
70). Which of the following are the components of the DSP processor?
HintThe components of the DSP processor are Program memory, data memory, input-output and compute engine.
71). What is the purpose of program memory in a DSP processor?
HintThe purpose of program memory in a DSP processor is to record the programs in its memory for further processing.
72). What is the purpose of data memory in a DSP processor?
HintThe purpose of program memory in a DSP processor is to stores information to be processed.
73). What is the purpose of compute engine in a DSP processor?
HintThe purpose of compute engine in a DSP processor performs the mathematical operation.
74). What is the purpose of input/output in a DSP processor?
HintThe purpose of input/output in a DSP processor is to communicate with the external world.
75). Which of the following are the applications of DSP processors?
HintThe examples of DSP processor AV compression, 2D / 3D graphics acceleration, and music synthesis.
76). Which of the following are the examples of DSP processor?
HintExamples of DSP processor are TMS 320C40 and TMS320C50.
77). Which of the following is a microprocessor?
Hint8085 and 8086 are microprocessors.
78). 8085 is a ______ bit microprocessor.
Hint8085 is an 8-bit microprocessor.
Read more about 8085 Microprocessor.
79). 8085 is designed by ________.
Hint8085 is designed by an intel processor.
80). 8085 microprocessor has ________ bits of data bus.
Hint8085 microprocessor has 8 bits of a data bus.
81). 8085 microprocessor has _____ bits of address bus?
Hint8085 microprocessor has 16 bits to 64 KB of the address bus.
82). 8085 microprocessor has ________ bits of program counter.
Hint8085 microprocessor has 16 bits of a program counter.
83). 8085 microprocessor has ______ bits of stack pointer.
Hint8085 microprocessor has 16 Bits of the stack pointer.
84). 8085 microprocessor has six _______ bits of registers.
Hint8085 microprocessor has six 8 Bits of registers.
85). Which of the following are the register pair in the 8085 microprocessor?
HintThe register pair in the 8085 microprocessor are BC, DE, and HL.
86). Which of the following are the applications of the 8085 processor?
HintThe applications of 8085 processors are ovens, washing machines, and mobile phones.
87). Which of the following are the functional units of the 8085 processor?
HintThe functional units of the 8085 processor are accumulator, general-purpose register, program counter, ALU, stack pointer, temporary register, flag register, address and data bus, address and data buffer, interrupts.
88). What is the purpose of temporary registers in 8085?
HintThe purpose of temporary registers in 80885 is to holds data on a temporary basis.
89). How many flipflops are there in a flag register of 8085.
HintA flag register of 8085 contains 5 – 8bit flipflops namely S, Z, AC, P, and C.
Read more about Flip-Flops.
90). Which of the following are control signals of the 8085 processor?
HintControl signals of 8085 processor are READY, RD, WR, ALE.

Microprocessor Exam Questions & Answers

91). Which of the following are status signals of the 8085 processor?
HintStatus signals of 8085 processor are S0, S1, IO/M.
92). Which of the following are DMA signals of the 8085 processor?
HintDMA signals of 8085 processors are HOLD, HLDA.
93). Which of the following are RESET signals of the 8085 processor?
HintRESET signals of 8085 processor are RESET IN, RESET OUT.
94). What is the function of the RESET IN signal?
HintThe function of RESET IN signal is to reset input function.
95). What is the function of the RESET OUT signal?
HintThe function of the RESET OUT signal is to reset the output function.
96). Which of the following are interrupt signals in the 8085 processor?
HintInterrupt signals in the 8085 processors are INTR, RST 7.5, and RST 6.5.
97). What is the purpose of serial input/output control?
HintThe purpose of serial input/output control is to control serial data communication.
98). Data bus in 8085 is _______ directional.
HintData bus in 8085 is Bi-directional.
99). Data bus in 8085 is used for ______.
HintData bus in 8085 is used for storing data.
100). Address bus in 8085 is used for _________.
HintAddress bus in 8085 holds the location of the data address.
101). 8086 microprocessor supports _____ bits of ALU.
Hint8086 microprocessor supports32 bits of ALU.
102). Which of the following are the types of registers in the 8086 microprocessor?
Hint8086 Microprocessor, uses Segment Registers and General Purpose Registers.
103). 8086 can operate in ______ modes.
Hint8086 operates in two modes, Minimum and Maximum mode.
104). Name the modes in which 8086 performs operations.
Hint8086 performs operations in Minimum and Maximum.
105). How much power supply does 8086 need to perform operations?
Hint8086 requires +5v is needed to perform an operation.
106). What is the full form of HMOS?
HintThe full form of HMOS is "High-speed Metal Oxide Semiconductor."
107). 8086 uses ______ channel HMOS microprocessor.
Hint8086 uses an N- channel HMOS microprocessor.
108). What are the different types of flags in 8086?
HintThe different types of flags in 8086 are the Status flag and control flag Directional flag, interrupt flag, trap flag Auxiliary carry flag, overflow flag, Parity flag, Sign flag Zero flag.
109). What is a bidirectional data bus?
HintDatabus is said to be bidirectional if data flows in both directions in and out.
110). What is the size of the address bus and data bus in the 8086 processor?
Hint8086 microprocessor uses address bus of 20 bit and data bus of 16 bit.
111). What is the use of addressing mode in 8086 microprocessor?
HintAn addressing mode allows to calculate operands effective memory address.
112 ). Which type of package of 8086 microprocessor?
Hint8086 microprocessor uses DIP (Dual In-Line) Package.
113). What is the use of zero flags in the 8086 microprocessor?
HintThe function of zero flags in the 8086 microprocessor is to check the result of the bitwise logical operation.
114). Does the 8086 processor has multiplication and division instructions?
Hint8086 have both multiplication and division instructions.
115). What are the operating frequencies of the 8086 microprocessor?
Hint8086 microprocessor operates 5 MHz, 8MHZ, 10MHZ.
116). Which type of technology used in the manufacturing of the 8086 microprocessor?
HintHMOS technology is used in the manufacturing of 8086 microprocessors.
117). What are the characteristics of the flag register in 8086?
HintA flag register used in 8086 is a special purpose register, with 16 bits, it is changed to 0/ 1 after arithmetic and logic operation.
118). Zero flag is a ______ bit flag of 8086 processor.
HintZero flag is a 1-bit flag of 8086 processor.
119). What is the purpose of zero flags in the 8086 processor?
HintThe purpose of zero flags in the 8086 processor is to check arithmetic operations and include bitwise logical instruction.
120). 8086 is a _________.
Hint8086 is a microprocessor.
121). 8051 is a ________.
Hint8051 is a microcontroller.

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