Which of the following is NOT correct in the case of the output obtained from a full wave rectifier?

It is continuous output.

The correct answer is Option (3) → It is not intermittent output.

A full-wave rectifier converts both halves of the AC input into output of the same polarity. As a result, the output is unidirectional and pulsating, with current flowing in only one direction. Unlike a half-wave rectifier, there are no long gaps between successive output pulses, so the output is often described as not intermittent.

Option 4: It is continuous output. — Incorrect. The output of a full-wave rectifier is not truly continuous DC. Although it does not drop to zero for an entire half-cycle, it still varies in magnitude and contains ripples. A truly continuous output is obtained only after suitable filtering.

Option 1: It is unidirectional output. — Correct. The current through the load flows in only one direction.

Option 2: It is pulsating output. — Correct. The output voltage changes with time and consists of pulses.

Option 3: It is not intermittent output. — Correct. Since both half-cycles contribute to the output, there are no complete gaps between alternate half-cycles as in a half-wave rectifier.