ALU 101 Instruction Set and Operations

Question 1

What is an instruction set architecture (ISA)?

Accepted Answer

The set of instructions a processor can execute, defining its programming interface

Answer

The physical layout of the ALU chip

Answer

The cache organization of the CPU

Answer

The power management system of the CPU

Question 2

What does an arithmetic shift right operation do to a signed binary number?

Accepted Answer

Divides it by 2, preserving the sign bit

Answer

Multiplies it by 2

Answer

Clears all bits

Answer

Inverts the sign bit

Question 3

A logical shift left by 1 bit is equivalent to:

Accepted Answer

Multiplying by 2

Answer

Dividing by 2

Answer

Rotating bits

Answer

Clearing the MSB

Question 4

Which type of instruction tells the ALU to compare two values?

Accepted Answer

COMPARE (CMP)

Answer

MOVE

Answer

LOAD

Answer

STORE

Question 5

What addressing mode uses the value in a register as the memory address to access?

Accepted Answer

Register indirect addressing

Answer

Immediate addressing

Answer

Direct addressing

Answer

Implied addressing

Question 6

In an RISC architecture, ALU instructions typically operate on:

Accepted Answer

Only register operands

Answer

Memory operands directly

Answer

I/O port values

Answer

Constants stored in ROM