EM4 Digital Electronics Practice Test

The main idea being tested is what the arithmetic logic unit does inside a CPU. The ALU is the part of the processor that actually performs calculations and logical operations on data. It takes operands from registers, does the math or logic, and places the result back where it’s needed. It doesn’t control the whole processor or dictate the sequence of operations. That controlling role is handled by the control unit, which orchestrates the fetch–decode–execute cycle and issues the signals that drive the ALU, registers, and memory.

Other components mentioned have different jobs: the memory management unit handles addressing and protection (in systems that include it), the clock generator provides the timing that coordinates all activities, and the data bus is the pathway that carries data between parts of the system. So the ALU is best understood as the processing core of the CPU, not its control element.