Q.1

The internal RAM memory of the 8051 is:

  • 32 bytes
  • 64 bytes
  • 128 bytes
  • 256 bytes
Q.2

The contents of the accumulator after this operation
MOV A,#0BH
ANL A,#2CH
will be

  • 11010111
  • 11011010
  • 00001000
  • 00101000
Q.3

The ADC0804 has ________ resolution.

  • 4-bit
  • 8-bit
  • 16-bit
  • 32-bit
Q.4

The number of data registers is:

  • 8
  • 16
  • 32
  • 64
Q.5

The statement LCALL READ passes control to the line labelled READ.

  • True
  • False
Q.6

Which of the following commands will copy the contents of location 4H to the accumulator?

  • MOV A, 04H
  • MOV A, L4
  • MOV L4, A
  • MOV 04H, A
Q.7

The special function registers are maintained in the next 128 locations after the general-purpose data storage and stack.

  • True
  • False
Q.8

Which of the following instructions will move the contents of register 3 to the accumulator?

  • MOV 3R, A
  • MOV R3, A
  • MOV A, R3
  • MOV A, 3R
Q.9

Device pins XTAL1 and XTAL2 for the 8051 are used for connections to an external oscillator or crystal.

  • True
  • False
Q.10

The 8051 has ________ parallel I/O ports.

  • 2
  • 3
  • 4
  • 5
Q.11

The I/O port that does not have a dual-purpose role is:

  • port 0
  • port 1
  • port 2
  • port 3
Q.12

This program code will be executed continuously:

STAT: MOV A, #01H
 JNZ STAT
  • True
  • False
Q.13

A HIGH on which pin resets the 8051 microcontroller?

  • RESET
  • RST
  • PSEN
  • RSET
Q.14

An alternate function of port pin P3.1 in the 8051 is:

  • serial port input
  • serial port output
  • memory write strobe
  • memory read strobe
Q.15

When the 8051 is reset and the EA line is LOW, the program counter points to the first program instruction in the:

  • internal code memory
  • external code memory
  • internal data memory
  • external data memory
Q.16

This statement will set the address of the bit to 1 (8051 Micro-controller):
SETB 01H

  • True
  • False
Q.17

Which of the following statements will add the accumulator and register 3?

  • ADD @R3, @A
  • ADD @A, R3
  • ADD R3, A
  • ADD A, R3
Q.18

The total external data memory that can be interfaced to the 8051 is:

  • 32K
  • 64K
  • 128K
  • 256K
Q.19

Different instruction sets must make up for the various members of the 8051 family.

  • True
  • False
Q.20

Analog output current must be converted into a usable voltage. To perform this current-to-voltage conversion a 700 op amp may be used.

  • True
  • False
0 h : 0 m : 1 s