MCQOPTIONS
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MCQOPTIONS
This section includes 133 Mcqs, each offering curated multiple-choice questions to sharpen your Microprocessor knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
How many output lines are there in the display section? |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» D. 16 | |
| 52. |
How many scan lines are there in 8279? |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» C. 8 | |
| 53. |
What will be the CW if 8254 is programmed to generate a pulse 50 ms from counter 0? |
| A. | 14 H |
| B. | 15 H |
| C. | 12 H |
| D. | 10 H |
| Answer» B. 15 H | |
| 54. |
What will be the CW if 8254 is programmed to generate a 1 kHz square wave from counter 1? |
| A. | 77 H |
| B. | 76 H |
| C. | 85 H |
| D. | 87 H |
| Answer» B. 76 H | |
| 55. |
In mode 1 of 8255, which of the following port provides for the handshake signals? |
| A. | Port A |
| B. | Port B |
| C. | Port C |
| D. | Port D |
| Answer» D. Port D | |
| 56. |
In a flag register of 8086, which bit no. is used for the overflow flag and zero flag? |
| A. | 11 and 6 |
| B. | 10 and 9 |
| C. | 11 and 0 |
| D. | Data insufficient |
| Answer» B. 10 and 9 | |
| 57. |
The stack segment register is used to hold the upper bits of the starting address for the program stack in 8086. |
| A. | 8 |
| B. | 16 |
| C. | 32 |
| D. | None of these |
| Answer» C. 32 | |
| 58. |
What does the BIU of 8086 contain? |
| A. | Quene |
| B. | Segment register |
| C. | Instruction pointer |
| D. | All of these |
| Answer» E. | |
| 59. |
What will be the CW if 8254 is to be programmed as a counter in binary and mode 0 using counter 2? |
| A. | BO H |
| B. | AO H |
| C. | BI H |
| D. | AI H |
| Answer» B. AO H | |
| 60. |
How many identical 16-bit counters can operate independently on 8254? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 61. |
Which of the following uses can intel 8254 be implemented to? |
| A. | An event counter |
| B. | Rise-time clock |
| C. | A square wave generator |
| D. | All of the above |
| Answer» E. | |
| 62. |
How many pins are there in Intel 8254, programmable interval timer? |
| A. | 24 |
| B. | 20 |
| C. | 40 |
| D. | 36 |
| Answer» B. 20 | |
| 63. |
What is the IC no. for the programmable interval timer? |
| A. | 8279 |
| B. | 8255 |
| C. | 8155 |
| D. | 8254 |
| Answer» E. | |
| 64. |
How many interrupts can 8259 A handle? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 65. |
In how many different modes can intel 8254 operate? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 66. |
What is the IC no. of the programmable interrupt controller? |
| A. | 8259 |
| B. | 8254 |
| C. | 8279 |
| D. | 8155 |
| Answer» B. 8254 | |
| 67. |
In intel 8086, what is the size of the Accumulator register? |
| A. | 8 bit |
| B. | 16 bit |
| C. | 32 bit |
| D. | None of these |
| Answer» C. 32 bit | |
| 68. |
How many input pins are there for interrupt requests? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 69. |
What will be BSR control word if PC |
| A. | OF H |
| B. | OE H |
| C. | 07 H |
| D. | 06 H |
| Answer» B. OE H | |
| 70. |
If all the ports of 8255 are programmed as O/P ports in mode 1, the CW will be |
| A. | A 4 H |
| B. | 84 H |
| C. | AO H |
| D. | 80 H |
| Answer» B. 84 H | |
| 71. |
What will be the CW when ports of Intel 8255 are operating as follows: port A and PC as I/P in mode 0 and port B, Clow as O/P in mode 0? |
| A. | 98 H |
| B. | 18 H |
| C. | 88 H |
| D. | 90 H |
| Answer» B. 18 H | |
| 72. |
If all the ports of Intel 8255 are programmed as I/P ports in mode 0, the CW will be |
| A. | 9B H |
| B. | 1 BH |
| C. | 99 H |
| D. | 8 BH |
| Answer» B. 1 BH | |
| 73. |
Which of the following is/are function(s) of 8279? |
| A. | As a keyboard |
| B. | For scan |
| C. | For display |
| D. | All of these |
| Answer» E. | |
| 74. |
Bit D |
| A. | I/O bus |
| B. | BSR bus |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 75. |
The mode 1 of Intel 8255 performs |
| A. | Simple I/P |
| B. | Bi-directional Data transfer |
| C. | Simple I/O |
| D. | I/O with handshake |
| Answer» E. | |
| 76. |
Intel 8255 is a pin IC. |
| A. | 34 |
| B. | 40 |
| C. | 25 |
| D. | 20 |
| Answer» C. 25 | |
| 77. |
What is the IC number of the programmable peripheral interface? |
| A. | Intel 8255 |
| B. | Motorola 8255 |
| C. | Intel 8155 |
| D. | Intel 8237 |
| Answer» B. Motorola 8255 | |
| 78. |
Which of the following make 8155 different from 8255? |
| A. | A timer |
| B. | 3, 8-bit I/O ports |
| C. | Dynamic RAM |
| D. | None of these |
| Answer» B. 3, 8-bit I/O ports | |
| 79. |
How many I/O ports of 8 bit each are present in Intel 8155? |
| A. | 1 |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» C. 2 | |
| 80. |
Which of the following can be used as a multipurpose programmable device? |
| A. | Intel 8155 |
| B. | Intel 8255 |
| C. | Intel 8251 |
| D. | Intel 8237 |
| Answer» B. Intel 8255 | |
| 81. |
To program 8155, port A and port B as output ports, what will be the control word? |
| A. | 03 H |
| B. | 01 H |
| C. | 02 H |
| D. | F 3 H |
| Answer» B. 01 H | |
| 82. |
A 12 bit D/A converter is calibrated over the range 0 to 10V. Calculate the output, if input is 01H |
| A. | 2.44 mV |
| B. | 9 mV |
| C. | 10 mV |
| D. | None |
| Answer» B. 9 mV | |
| 83. |
The instruction RST 7 is a |
| A. | Restart instruction that begins the execution of a program |
| B. | One-byte call to the memory address 0038 H |
| C. | One-byte call to the memory address 0007 H |
| D. | Hardware interrupt |
| Answer» C. One-byte call to the memory address 0007 H | |
| 84. |
Whenever the POP H instruction is executed |
| A. | Data bytes in HL pair are stored on the stack |
| B. | Two data bytes at the top of the stack are transferred to the HL register pair |
| C. | Two data bytes at the top of the stack are transferred to the program counter |
| D. | Data bytes in pair on stack are transferred to the HL pair |
| Answer» C. Two data bytes at the top of the stack are transferred to the program counter | |
| 85. |
When a subroutine is called, the address of instruction following the CALL instruction is stored in/on the |
| A. | Stack pointer |
| B. | Accumulator |
| C. | Program counter |
| D. | Stack |
| Answer» D. Stack | |
| 86. |
Specify the contents of register A after the execution of following program |
| A. | F8 H |
| B. | 8F H |
| C. | 69 H |
| D. | 96 H |
| Answer» C. 69 H | |
| 87. |
The results of the arithmetic and logic operations are usually placed in which Register? |
| A. | A |
| B. | C |
| C. | B |
| D. | D |
| Answer» B. C | |
| 88. |
Which of the following instruction can be set to clear the CY flag? |
| A. | XRA A |
| B. | CLR |
| C. | AND A |
| D. | ADD A |
| Answer» B. CLR | |
| 89. |
Specify the flag status (CY, S, Z) after the instruction DRA is executed. |
| A. | 1, 1, 1 |
| B. | 0, 1, 10 |
| C. | 1, 0, 1 |
| D. | 1, 1, 0 |
| Answer» B. 0, 1, 10 | |
| 90. |
What operation can be performed by using the instruction SUBA? |
| A. | Clear the accumulator |
| B. | Subtract A with borrow |
| C. | Subtract A |
| D. | None of the above |
| Answer» B. Subtract A with borrow | |
| 91. |
LXI B, 1000 HLOOP : DCXBNOP JNZLOOP |
| A. | 1001 |
| B. | d |
| C. | 10 |
| D. | Infinitely |
| Answer» D. Infinitely | |
| 92. |
What will be the O/P, if the following program is executed? |
| A. | OOH |
| B. | FF H |
| C. | OOH with CY = 1 |
| D. | Error |
| Answer» C. OOH with CY = 1 | |
| 93. |
ORA A MVIB, 64 HLOOP : DCRB JNCLOOP |
| A. | 100 |
| B. | Infinitely |
| C. | 101 |
| D. | 0 |
| Answer» C. 101 | |
| 94. |
LOOP : |
| A. | 100 |
| B. | Infinitely |
| C. | 101 |
| D. | 0 |
| Answer» C. 101 | |
| 95. |
MVI A, 217 HLOOP : ORAARRC JNCLOOP |
| A. | 23 |
| B. | 1 |
| C. | 18 |
| D. | 0 |
| Answer» C. 18 | |
| 96. |
How many times the following loop will be executed? |
| A. | 7 times |
| B. | Can't say |
| C. | 8 times |
| D. | Infinitely |
| Answer» B. Can't say | |
| 97. |
Specify the output at PORT1, after the following program has been executed |
| A. | 82 H |
| B. | OO H |
| C. | 37 H |
| D. | FF H |
| Answer» B. OO H | |
| 98. |
Which of the following is commonly used to interface I/P devices? |
| A. | Latch |
| B. | Tri-state buffer |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» C. Both (A) and (B) | |
| 99. |
Which of the following device is commonly used to interface O/P devices? |
| A. | Latch |
| B. | Tri-state buffer |
| C. | Both (A) and (B |
| D. | None of these |
| Answer» B. Tri-state buffer | |
| 100. |
In an O/P and I/P port can have the same 8-bit address and data. How does the 8085 differentiate between the ports? |
| A. | Control signals |
| B. | Peripheral signals |
| C. | Address bus |
| D. | Data flow |
| Answer» B. Peripheral signals | |