Computer Knowledge

Digital Logic and Microprocessors

749 Questions

Digital logic and microprocessors form the core of computer science, covering logic gates, combinational and sequential circuits, and CPU architecture. These topics are crucial for computer knowledge sections in technical exams. Test your digital electronics basics here.

Logic gates and circuitsCombinational vs sequential circuitsMicroprocessor instructionsTruth tables and boolean functions

Digital Logic and Microprocessors Questions

Multiple choice

A half adder is also known as

  1. AND circuit

  2. NAND circuit

  3. NOR circuit

  4. XOR circuit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A half adder consists of an XOR gate for the sum output and an AND gate for the carry output. The XOR circuit performs the core addition logic for single-bit addition.

Multiple choice

Cyclic codes are used in

  1. data transfer

  2. continuously varying signal representative

  3. arithmetic and logical computation

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice

Which instruction performes a logical AND function between the specified byte, either in a register or in the address contained in the H & L register and the contents of the accumulator?

  1. AND instruction

  2. AND immediate

  3. Compare instruction

  4. OR instruction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

AND instruction performes a logical AND function between the specified byte, either in a register or in the address contained in the H & L register, and the contents of the accumulator.

Multiple choice

Which arithmetic instructions may use any of the addressing modes for one of the operands, but, except when the source operand is immediate, one of the two operands must be a register?

  1. Unpacked BCD Arithmetic

  2. Packed BCD Arithmetic

  3. Binary Arithmetic

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Binary Arithmetic Instruction may use any of the addressing modes for one of the operands, but, except when the source operand is immediate, one of the two operands must be a register.

Multiple choice

___________, the effective branch having content of register or memory location is accessed by using any of the data related addressing modes expect the immediate mode.

  1. Intrasegment indirect

  2. Intrasegment direct

  3. Intersegment direct

  4. Intersegment indirect
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Intrasegment indirect, the effective branch having the content of register or memory location is accessed by using any of the data related addressing modes expect the immediate mode.