Microprocessors And Microcontrollers — Part 2 MCQs with Explanations

False is the correct answer to “IC 7485 cannot be cascadeD.”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Concentrated refresh is the correct answer to “‘Burst refresh’ in DRAM is also called”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

.9432 E – 4 is changed to .09432 E – 3 and .5452 E – 3 is not changed is the correct answer to “When .9432 E – 4 is subtracted from .5452 E – 3 in normalized floating point mode”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

5 and 4 respectively is the correct answer to “In 8085, the pins for SID and SOD are”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Main memory and Input/Output devices is the correct answer to “An Input/Output processor controls the flow of information between”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

True is the correct answer to “MS Access is a DBMS software.”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Programmable CRT controller is the correct answer to “Which of the following is not a general purpose peripheral”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

False is the correct answer to “In Fortran 77 a variable name can contain special characters.”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

True is the correct answer to “It is possible to copy a file in the same directory.”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Indirect is the correct answer to “What is the addressing mode used in instruction MOV M, C”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Ch = [sp - 1], cl = [sp - 2] and sp = sp - 2 is the correct answer to “In microprocessor's stack, what does the operation push cx means”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

6 is the correct answer to “How many bits are used as conditional flags in the flag register of 8086”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Cascade mode is the correct answer to “If B 7 and B 6 bits of mode register in 8237 are set to 11, which mode of operation is selected”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

64 k bytes is the correct answer to “The address bus of Intel 8085 is 16-bit wide and hence the memory which can be accessed by this address bus is”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

16 is the correct answer to “What is the size(in bits) of the stack pointer in 8085”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Assertion of an interrupt and the start of the associated ISR is the correct answer to “Interrupt latency is the time elapsed between:”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

3, 1, 4, 5, 2 is the correct answer to “1. Program Counter (PC) Pushed to Stack 2. Generate LCALL to ISR 3. Complete Execution of instruction in progress 4. Clear the interrupt flag 5. Set interrupt in progress Correct order of execution of action taken by 8051 micro-controllers when an interrupt occurs:”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

LODSW with the direction flag reset is the correct answer to “Which of the 8086 instruction can be used to fetch a string of 16-bit word stored in memory, automatically incrementing the memory pointer”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

I2C & SPI is the correct answer to “Which of the following are two most commonly used industry standards for interchip serial communications”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

2 and 4 is the correct answer to “Consider the following instruction of 8085 µP. 1. MOV M, A 2. ADD C 3. MVI A, FF 4. CMP M Which of these cause change in the status of flag(s)”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

64 K is the correct answer to “What is the total external data memory that can be interfaced to the 8051”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

1000 is the correct answer to “Considering figure 1, if SI = 1000H, the content of register AH after the instruction MOV AH, [SI] of 8086 µp will be”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Bus is the correct answer to “In a computer, set of electrical paths which is used to transfer data is called”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

20 lines is the correct answer to “Address bus of 8086 contains”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Data bus is the correct answer to “An 8-bit microprocessor has the typical two way connected buffered lines which are called:”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

1, 2 and 4 only is the correct answer to “Consider the following statements: The 8259A Programmable Interrupt Controller can 1. manage eight interrupts 2. vector an interrupt request anywhere in the memory map 3. have 8-bit or 16-bit interval between interrupt vector locations 4. be initialized with operational command words Which of the above statements are correct”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

DMA controller is the correct answer to “A controller that takes control of the buses and transfers data directly between source and destination bypassing the microprocessor is known as”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

2 only is the correct answer to “In a 8051 microcontroller, PCON register controls the baud rate in: 1. Synchronous transmission 2. Asynchronous transmission”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

An opcode is one byte long for each instruction is the correct answer to “In 8051 family instructions, which one of the following option is true”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

0.7 µs is the correct answer to “If the operating frequency of an 8086 microprocessor is 10 MHz and, if for the given instruction, the machine cycle consists of 4 T-states, what will be the time taken by the machine cycle to complete the execution of that machine cycle to complete the execution of that same instruction when three wait states are inserted”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

4 push and 3 pcs instruction is the correct answer to “A stake machine pushes operands on a stack and evaluates binary operators by a pcs (i.e pop/compute/store) where the top two operands are popped computation is performed and the result is pushed onto stack. Evaluation of an expression (x*y)+ (u*v) by Reverse Polish notation in a stack machine needs”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

A fetch cycle is the correct answer to “The first machine cycle of an instruction is always”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

100 is the correct answer to “A CDMA system requires $$\frac{{{{\text{E}}_{\text{b}}}}}{{{{\text{I}}_0}}}$$ of 10 dB. Each of the transmitters in the network transmits data at the rate of 1 Kbps with a PN chip rate of 1 Mbps. The maximum number of such users that the network can support is:”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

0028 H is the correct answer to “If instruction RST 5 is written in a program the problem will jump to location”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

Relative mode is the correct answer to “In case the code is position dependent, the most suitable addressing mode is”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

40 is the correct answer to “The number of pins in microprocessor 8086 is”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

INT 2 ⟺ Break point is the correct answer to “Which one of the following pairs of 8086 microprocessor's interrupt is not correctly matched”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

MOVC is the correct answer to “Which instruction of 8051 microcontroller is used for reading data from code memory”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

6979 is the correct answer to “The following instructions have been executed by an 8085 microprocessor ADDRESS (HEX) INSTRUCTION 6010 LXI H, 8A79H 6013 MOV A, L 6014 ADD H 6015 DAA 6016 MOV H, A 6017 PCHL From which address will the next instruction be fetched”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.

TRAP is the correct answer to “Which of the following interrupts is unmaskable interrupts”. This question is standard in competitive examination syllabi for Microprocessors And Microcontrollers.