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8085 Microprocessor Question & Answers

October 11, 2021 By WatElectronics

This article lists 100+ 8085 Microprocessor MCQs for engineering students. All the 8085 Microprocessor Questions & 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 8085 Microprocessor

8085 Microprocessor is an 8-bit programmable IC or integrated circuit invented by Intel in the year 1977. This microprocessor uses NMOS technology and it is pronounced “eighty-eighty-five” microprocessor. This microprocessor has the capabilities of decision-making & computing like the CPU of a personal computer.

The configuration of 8085 is available with data bus - 8-bit, address bus - 16-bit,  a 16-bit based program counter (PC), stack pointer -16-bit, 8-bit registers - 6 which are arranged in BC, HL & DE pairs and needs 5V supply at 3.2 MHZ 1-phase CLK.

The functional unit 8085 microprocessor includes ALU, accumulator, the program counter (PC), the stack pointer (SP), general-purpose register, flag register, temporary register, address bus, data bus, interrupt control, serial I/O control, etc.

The applications of the 8085 microprocessor include almost all electronic devices which include printers, mobiles, washing machines, and also in superior applications such as flights, satellites, radars, etc.

1). How many pins of 8085 microprocessor includes?
HintIt includes above 35 pins
2). How many output pins an 8085 microprocessor includes?
HintIt ranges from < 25 > 30
3). The 8085 microprocessor program counter or PC is a 16-bit register, for the reason that?
HintIt includes sixteen address lines
4). In 8085A Intel microprocessor, the signal of an ALE signal is finished high to...?
HintHere data bus is used as a less order data bus
5). Which of the following is the first machine cycle instruction for an 8085 Intel microprocessor.
HintIt is also known as op-code.
6). What is the function of the READY signal in an 8085 microprocessor?
HintThis is an active high i/p control signal
7). Which of the following flag is present in the 8085 microprocessor?
HintIt allows the operation of processors within single step condition
8). The ALU of 8085 microprocessor includes?
HintMaximum all the components
9). Which of the following 16-bit register is for 8085?
HintIt is used to store 8-bit data
10). What are the DMA signals for 8085 microprocessors?
HintIt transfers the data directly without any interrupt of the CPU
11). What kind of interrupts are RST0 to RST7 in the 8085 microprocessor?
HintIt causes through a special instruction within the instruction set
12). Which of the following interrupt is non-vectored in 8085?
HintIt is a maskable interrupt
13). The segments of 8085 microprocessor includes?
HintIt includes >3 < 5 segments
14). Which of the following microprocessor includes virtual memory in the family of Intel microprocessors?
HintIt is a 16-bit microprocessor
15). How many maskable interrupts are available in the 8085 microprocessor?
HintIt ranges from > 3 < 5
16). Which of the following STACK is used in 8085?
HintIts full form is last in first out
17). How many bytes are present in the 8085 instruction
HintMinimum two otherwise 3
18). The addressing technique which is not used in 8085?
HintThis addressing is available in bytes only
19). Which of the following register is not used in the 8085 programming model?
HintIt includes the data regarding the state of the microprocessor
20). Consider the below registers like
1).  Accumulator & flag register
2). Registers B & C
3). Registers D &E
4). Registers H & L
And which of the above registers can be coupled jointly for making a 16-bit register?
HintThey are B,D, C,H, L, E
21). The maskable interrupts in 8085 microprocessor are?
HintThey are INTR, RST 6.5, 5.5 & 7.5
22). Which of the following stack is used in 8085?
HintIt is also known as last in first out
23). In the 8085 instruction set, how many bytes are present?
HintThe bits present in the instruction set are a minimum 1 maximum of 3
24). In 8085, which of the following addressing method is not used?
HintIn this method, the operand’s Effective Address is calculated.
25). Which of the below register is not used in the programming of 8085?
HintThis is also known as SR

8085 Microprocessor MCQs for Interviews

26). Data transfer in handshaking mode is called?
HintThe data transfer can be done synchronously.
27). Universal shift register operates……modes?
HintIt operates in four modes
Please refer to this link to know more about Shift Registers
28). Which of the following instruction will affect the highest number of flags?
HintIt is also called eXclusive OR accumulator
29). Which of the following instructions is used with the Direction flag?
HintThese instructions work on strings of bytes
30). The 8085 consists of…..outputs?
HintIt ranges from > 20 < 30
31). Which of the following register is 16-bit in 8085?
HintIt is a small register in the CPU of a computer
32). 8085 microprocessor is designed by?
HintIt is located in Santa Clara, California
33). In 8085 microprocessor, the address bus with 16-bit can address up to?
HintIt can address up to 64 kilobytes.
34). How many general-purpose registers are there in 8085?
HintThey are B, C, D, E, H, and L
35). The data within the stack is known as?
HintThe data is transmitted into the stack
36). The TRAP address in 8085 is?
HintThis interrupt transmits the control toward the 0024H location
37). The data transfer from…. to…. is not possible in a microprocessor?
HintThis microprocessor access upto 64Kb
38). The term ‘EA’ in the microprocessor stands for?
HintThis is used in all kinds of microprocessors
39). INTR stands for?
HintIt is a maskable interrupt in a microprocessor
40). The example of a microprocessor-based on accumulator?
HintIt is an 8-bit processor and launched in the year 1976
41). Which of the following signal not comes under the control bus?
HintIt is also denoted with RST
42). The technology used to design the first 8085 microprocessor is?
HintThis technology is very simple but slow
43). The opcodes present in the 8085 microprocessor is…?
HintIt is an 8-bit microprocessor, so the possibility is 2^8 = 256 but includes only 246
44). In 8085, the possibilities of mapping for memory registers are…?
HintThis processor includes 16-address lines so 2^16 memory registers can be simply mapped.
45). The addressing mode used in the 8085 microprocessor for a list and array operations….?
HintTo execute the instruction, it uses a stable value & index register.
46). In 8085, the software interrupt is.?
HintThis is a vectored interrupt
47). The hardware interrupt in 8085 is.?
HintIt is one kind of maskable interrupt
48). The address lines required to connect the microprocessor with a 4KB RAM is.?
HintIt ranges from above 10 and below 20
49). BCD addition in 8085 can be performed by…instruction?
HintIt stands for decimal adjust after Addition
50). The two-word instruction in 8085 microprocessor is…?
HintThe two-word instruction is IN 01H

8085 Microprocessor MCQs for Exams

51). Which of the following includes within ‘n’ instruction
HintThe short form of this is known as opcode
52). For which of the following flag, the conditional instructions are not dependent?
HintIt is also called an auxiliary carry flag
53). Which of the following chip is a DMA controller?
HintThe direct memory access controllers are 8237 or 8257
54). PSW of 8085 has five flags they are?
HintFive flags of Processor status word in 8085 are S, Z, AC, P, CY
55). In 8085 microprocessor, which of the below cycle is used to fetch & execute an instruction?
HintIt is also called a clock cycle
56). BIU stands for?
HintIt works as an interface through the system bus
57). What is the full form of IP?
HintOnce an instruction is fetched then instruction IP will be increased
58). What is CS in a microprocessor?
HintIt is also known as the text segment
59). What is DS in a microprocessor?
HintIt is an object file’s portion
60). When the Accumulator is wide with 16-bit then it is called?
HintIt is the primary type accumulator
61). What is PROM?
HintIt is one kind of digital memory
62). What is EPROM?
HintIt stores the data even there is no power
63). Which of the following is used to locate the data item to store?
HintIt is a type of command used in SQL
64). The computer ALU includes?
HintThese are used by the CPU
65). Which of the following ICs are used for processing the data?
HintIt is also called programmable read-only memory
66). An error within computer data is called?
HintWhen a fault occurs in a computer program
67). The word length in a 32-bit microprocessor is equivalent to….?
HintIt is equal to 0.004 kilobytes
68). The access time of cache memory has….?
HintThis memory is also called CPU memory
69). In computers, which of the following part is used to calculate & compare?
HintIt is also known as arithmetic logic unit
70). In a computer, the word length can be measured in…..?
HintIt is equal to 0.125 byte
71). Which of the following processor was invented by Intel?
HintIt is a 4-bit CPU
72). What is the SI stands for in a microprocessor?
HintIt is one kind of register in microprocessor
73). What is BP stands for?
HintIt is used to access different parameters supplied by the stack
74). The buses connected in the 8085A microprocessor are?
HintThe buses are address, control & data
Please refer to this link to know more about Microprocessor
75). Which of the following software is used to run a microprocessor?
HintIt is abbreviated like asm in some cases.

8085 Microprocessor MCQs for Quiz

76). Which of the following processor is programmed during the process of manufacturing?
HintIt is an alternative to the PROM
77). In a machine, the o/p of the assembler is called as?
HintThese programs are available in the form of machine language
78). Which of the following pair of the register is used to specify memory?
HintThis pair acts as a memory pointer
79). The nonmaskable interrupt examples in 8086…?
HintIt is an asynchronous interrupt activated through an exception
80). Which of the following load pointer is used to load the stack pointer?
HintIt is a load pointer with DS
81). In a flag register of 8085, how many FFs are there?
HintThe FFs are S, Z, AC, P, C
82). Which flag is used in BCD operations of 8085?
HintThis flag is known as auxiliary carry flag
83). Which of the following addition is performed in DAA instruction of 8085?
HintIt is also called binary-coded decimal
84). Which of the following instruction uses direct addressing?
HintIt stands for Store accumulator contents within memory
85). Which of the following circuit is used to send out two messages simultaneously within a single direction?
HintThat executes FDM or frequency-domain multiplexing
86). Which of the following is not a control bus signal?
HintIt is one kind of signal
87). Which of the following memory is used to retries the instructions?
HintThese are also called sometimes RAM & ROM
88). The signal detached by the CPU to finish the operation of whole memory?
HintThis is one kind of control signal
89). The 8085 uses ….frequency?
HintIt ranges from 3 to 6
90). The 4-index register in the microprocessor is used for?
HintIt includes all the operations like addition, subtraction, division & multiplication
91). What is IP in a microprocessor?
HintIt is also known as IAR or instruction address register
92). Which of the following is a typical dedicated register?
HintIt is one of the essential registers in the CPU
93). What is the function of a logical unit within the computer’s CPU?
HintThis unit is used to compare two numbers
94). What is the function of a logical unit within the computer’s CPU?
HintThis unit is used to compare two numbers
95). Which of the following ICs are called the Si chips?
HintIt is also known as programmable read-only memory
96). Which of the below ICs is not belongs to 8-bit?
HintIt is the first microprocessor launched by Intel
97). The speed of any microprocessor can be determined in terms of…….?
HintIt is measured in MHz
98). The direction of the data line is?
HintIt is also called as the data bus
99). In which of the following RAM, Bipolar transistors are used?
HintIt stores data in a stable form
100). Dynamic RAM is designed by…..?
HintThese are also known as MOSFETs
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