8085 Microprocessor Question & AnswersOctober 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 Microprocessor8085 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 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?40352864HintIt includes above 35 pins 2). How many output pins an 8085 microprocessor includes?40192721HintIt ranges from < 25 > 30 3). The 8085 microprocessor program counter or PC is a 16-bit register, for the reason that?At a time it calculates 16-bitsAddress lines are 16It helps the user in storing 16-bit data for the time beingAt a time it has to obtain two 8-bit dataHintIt includes sixteen address lines 4). In 8085A Intel microprocessor, the signal of an ALE signal is finished high to...?Allow the data bus to be utilized like a low order address busTo handle D0-D7 data from the data busTo immobilize data busTo get all the above functionsHintHere 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.Write cycle for a memoryOperation code for fetch cycleRead cycle for a memoryInput/output read cycleHintIt is also known as op-code. 6). What is the function of the READY signal in an 8085 microprocessor?To specify to the user that 8085 is working properly as well as is ready for utilizeTo offer appropriate WAIT states as the 8085 is conversing by a slow peripheral deviceTo slow down a quick device for communicating at the device of microprocessorNone of theseHintThis is an active high i/p control signal 7). Which of the following flag is present in the 8085 microprocessor?Sign flagTrap flagParity flagAuxiliary carry flagHintIt allows the operation of processors within single step condition 8). The ALU of 8085 microprocessor includes?Accumulator, short-term register, arithmetic & logic circuitsArithmetic, Accumulator, logic circuits & 5 flagsAccumulator, short-term register, logic circuits, arithmetic, & 5 five flagsAccumulator, arithmetic & logic circuitsHintMaximum all the components 9). Which of the following 16-bit register is for 8085?AccumulatorRegister CStack pointerRegisterHintIt is used to store 8-bit data 10). What are the DMA signals for 8085 microprocessors?READYHOLDHLDAAll of the aboveHintIt transfers the data directly without any interrupt of the CPU 11). What kind of interrupts are RST0 to RST7 in the 8085 microprocessor?Logical interruptsHardware interruptsConditional interruptsSoftware interruptsHintIt causes through a special instruction within the instruction set 12). Which of the following interrupt is non-vectored in 8085?RST 5.5TRAPINTRRST 7HintIt is a maskable interrupt 13). The segments of 8085 microprocessor includes?4321HintIt includes >3 < 5 segments 14). Which of the following microprocessor includes virtual memory in the family of Intel microprocessors?Pentium803868028680486HintIt is a 16-bit microprocessor 15). How many maskable interrupts are available in the 8085 microprocessor?1468HintIt ranges from > 3 < 5 16). Which of the following STACK is used in 8085?LIFOFIFOLILOFILOHintIts full form is last in first out 17). How many bytes are present in the 8085 instruction1 or 21, 2 or 3Only 12 or 3HintMinimum two otherwise 3 18). The addressing technique which is not used in 8085?RegisterRelativeImmediateIndirect RegisterHintThis addressing is available in bytes only 19). Which of the following register is not used in the 8085 programming model?InstructionStatusMemory addressTemporary DataHintIt includes the data regarding the state of the microprocessor 20). Consider the below registers like1). Accumulator & flag register2). Registers B & C 3). Registers D &E 4). Registers H & LAnd which of the above registers can be coupled jointly for making a 16-bit register?1, 3 & 41, 2 & 32, 3 & 41, 2 & 4HintThey are B,D, C,H, L, E 21). The maskable interrupts in 8085 microprocessor are?2468HintThey are INTR, RST 6.5, 5.5 & 7.5 22). Which of the following stack is used in 8085?LIFOFIFOLILOFILOHintIt is also known as last in first out 23). In the 8085 instruction set, how many bytes are present?1 or 21 or 2 or 324HintThe 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?ImmediateRelativeRegister indirectRegisterHintIn this method, the operand’s Effective Address is calculated. 25). Which of the below register is not used in the programming of 8085?InstructionStatusMemory AddressTemporary DataHintThis is also known as SR8085 Microprocessor MCQs for Interviews 26). Data transfer in handshaking mode is called?Interrupt data-drivenSynchronousAsynchronousDMAHintThe data transfer can be done synchronously. 27). Universal shift register operates……modes?1234HintIt 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?DBR ARALXRA ARBLHintIt is also called eXclusive OR accumulator 29). Which of the following instructions is used with the Direction flag?StackStringBranchArithmeticHintThese instructions work on strings of bytes 30). The 8085 consists of…..outputs?15182730HintIt ranges from > 20 < 30 31). Which of the following register is 16-bit in 8085?Register AAccumulatorRegister CStack PointerHintIt is a small register in the CPU of a computer 32). 8085 microprocessor is designed by?IntelDellIBMVAXHintIt is located in Santa Clara, California 33). In 8085 microprocessor, the address bus with 16-bit can address up to?8 KB16 KB32 KB64 KBHintIt can address up to 64 kilobytes. 34). How many general-purpose registers are there in 8085?2456HintThey are B, C, D, E, H, and L 35). The data within the stack is known as?Pulling dataPushed dataPushing dataPulled dataHintThe data is transmitted into the stack 36). The TRAP address in 8085 is?002CH0024H0105H013AHHintThis interrupt transmits the control toward the 0024H location 37). The data transfer from…. to…. is not possible in a microprocessor?ACCU to memoryMemory to ACCUACCU to ACCUOne memory to another memoryHintThis microprocessor access upto 64Kb 38). The term ‘EA’ in the microprocessor stands for?Enable addressEfficient addressExclusive addressEffective addressHintThis is used in all kinds of microprocessors 39). INTR stands for?Interrupt resetInterrupt responseInterrupt requestInterrupt ronaughHintIt is a maskable interrupt in a microprocessor 40). The example of a microprocessor-based on accumulator?Motorola 6809Intel 8085Intel 8086Motorola 6807HintIt is an 8-bit processor and launched in the year 1976 41). Which of the following signal not comes under the control bus?ResetEnableReadWriteHintIt is also denoted with RST 42). The technology used to design the first 8085 microprocessor is?TTLNMOSCMOSPMOSHintThis technology is very simple but slow 43). The opcodes present in the 8085 microprocessor is…?230246250256HintIt 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…?54536615366553655536HintThis 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….?ImmediateIndexedDirectBase registerHintTo execute the instruction, it uses a stable value & index register. 46). In 8085, the software interrupt is.?INTRRST-5TRAPRST-5.5HintThis is a vectored interrupt 47). The hardware interrupt in 8085 is.?INTRRST-5EAHLDAHintIt is one kind of maskable interrupt 48). The address lines required to connect the microprocessor with a 4KB RAM is.?10122025HintIt ranges from above 10 and below 20 49). BCD addition in 8085 can be performed by…instruction?DAALXILDALHLDHintIt stands for decimal adjust after Addition 50). The two-word instruction in 8085 microprocessor is…?IN 01HJMP 2085HMOV A, BADC 2500HHintThe two-word instruction is IN 01H8085 Microprocessor MCQs for Exams 51). Which of the following includes within ‘n’ instructionMemoryAddress of the dataInstruction operatesOperation codeHintThe short form of this is known as opcode 52). For which of the following flag, the conditional instructions are not dependent?ACCCYPHintIt is also called an auxiliary carry flag 53). Which of the following chip is a DMA controller?8237/5782798253/548155HintThe direct memory access controllers are 8237 or 8257 54). PSW of 8085 has five flags they are?S, Z, AC, P, OVS, OV, Z, AC, PS, Z, AC, P, CYS, Z, OV, P, CYHintFive 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?MemoryInstructionCLKMachineHintIt is also called a clock cycle 56). BIU stands for?Bus interrupt unitBus instruction unitBus interface unitNoneHintIt works as an interface through the system bus 57). What is the full form of IP?Instruction PairInstruction PowerInstruction PointerInstruction PurposeHintOnce an instruction is fetched then instruction IP will be increased 58). What is CS in a microprocessor?Component SetCode SegmentCounter SegmentComponent SegmentHintIt is also known as the text segment 59). What is DS in a microprocessor?Declare SegmentData SegmentDirect SegmentDouble SegmentHintIt is an object file’s portion 60). When the Accumulator is wide with 16-bit then it is called?AHAXDXALHintIt is the primary type accumulator 61). What is PROM?Programmable Read-Only MemoryPost-Random Only MemoryPre Read-Only MemoryProgrammable Random Only MemoryHintIt is one kind of digital memory 62). What is EPROM?Electrical Programmable ROMErasable Programmable ROMEnable Programmable ROMErasable Programmable Random Only MemoryHintIt stores the data even there is no power 63). Which of the following is used to locate the data item to store?FetchDatabaseStringEnableHintIt is a type of command used in SQL 64). The computer ALU includes?Hard disksRegistersMemoryCountersHintThese are used by the CPU 65). Which of the following ICs are used for processing the data?RAMROMPROMMicrocontrollersHintIt is also called programmable read-only memory 66). An error within computer data is called?HaltBugMistakeInaccuracyHintWhen a fault occurs in a computer program 67). The word length in a 32-bit microprocessor is equivalent to….?3 byte4 byte5 byte6 byteHintIt is equal to 0.004 kilobytes 68). The access time of cache memory has….?ShortestLongestMiddleNone of the aboveHintThis memory is also called CPU memory 69). In computers, which of the following part is used to calculate & compare?ALUDiskControlModemHintIt is also known as arithmetic logic unit 70). In a computer, the word length can be measured in…..?BitsBytesMemoryRAMHintIt is equal to 0.125 byte 71). Which of the following processor was invented by Intel?8009400480908805HintIt is a 4-bit CPU 72). What is the SI stands for in a microprocessor?Source IndexSource InterestStandard IndexSegment IndexHintIt is one kind of register in microprocessor 73). What is BP stands for?Base PointerBus PointerByte PointerBit PointerHintIt is used to access different parameters supplied by the stack 74). The buses connected in the 8085A microprocessor are?2357HintThe 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?VHDLAssembly LanguageCJavaHintIt 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?PROMEPROMMROMEEPROMHintIt is an alternative to the PROM 77). In a machine, the o/p of the assembler is called as?Object programCNC programSymbolic addressingSource programHintThese programs are available in the form of machine language 78). Which of the following pair of the register is used to specify memory?H & LE & DB & CX & ZHintThis pair acts as a memory pointer 79). The nonmaskable interrupt examples in 8086…?intrtraprst5.5rst6.7HintIt is an asynchronous interrupt activated through an exception 80). Which of the following load pointer is used to load the stack pointer?bhsbgtLDSRTSHintIt is a load pointer with DS 81). In a flag register of 8085, how many FFs are there?35710HintThe FFs are S, Z, AC, P, C 82). Which flag is used in BCD operations of 8085?ACZSPHintThis flag is known as auxiliary carry flag 83). Which of the following addition is performed in DAA instruction of 8085?BinaryBCDOctalExcess-3HintIt is also called binary-coded decimal 84). Which of the following instruction uses direct addressing?CMASTARLCRRCHintIt 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?SimplexDuplexDiplexQuadruplexHintThat executes FDM or frequency-domain multiplexing 86). Which of the following is not a control bus signal?READRST or RESETENABLEHOLDHintIt is one kind of signal 87). Which of the following memory is used to retries the instructions?VirtualMainCacheControlHintThese are also called sometimes RAM & ROM 88). The signal detached by the CPU to finish the operation of whole memory?WriteEnableReadALEHintThis is one kind of control signal 89). The 8085 uses ….frequency?2 MHz3 MHz10 MHz15 MHzHintIt ranges from 3 to 6 90). The 4-index register in the microprocessor is used for?DivisionMultiplicationSubtractionArithmeticHintIt includes all the operations like addition, subtraction, division & multiplication 91). What is IP in a microprocessor?Internet ProtocolInstruction PointerInternet PointerInterrupt ProtocolHintIt is also known as IAR or instruction address register 92). Which of the following is a typical dedicated register?PCIPSPLRHintIt is one of the essential registers in the CPU 93). What is the function of a logical unit within the computer’s CPU?To evaluate numbersTo generate resultTo control information flowNone of the aboveHintThis unit is used to compare two numbers 94). What is the function of a logical unit within the computer’s CPU?To evaluate numbersTo generate resultTo control information flowNone of the aboveHintThis unit is used to compare two numbers 95). Which of the following ICs are called the Si chips?RAMPROMROMEPROMHintIt is also known as programmable read-only memory 96). Which of the below ICs is not belongs to 8-bit?80804004808568000HintIt is the first microprocessor launched by Intel 97). The speed of any microprocessor can be determined in terms of…….?Based on TimeFrequency of CLKResistanceBits/SecHintIt is measured in MHz 98). The direction of the data line is?BidirectionalUnidirectionalTri-directionalMultidirectionalHintIt is also called as the data bus 99). In which of the following RAM, Bipolar transistors are used?Static RAMDynamic RAMDDRPermanentHintIt stores data in a stable form 100). Dynamic RAM is designed by…..?MOS transistorsICsBJTsFETsHintThese are also known as MOSFETs Time is Up! Time's up
