How the multiple-choice questions actually work.

A well-written multiple-choice examination is not a guessing game, and the NABCEP paper is well written. The three wrong options are not random: each one is the answer you would reach by making a specific, predictable mistake. Learning to recognise those mistakes is worth real marks.

The four options are not equal

In a calculation question you can usually expect: the right answer; the answer you get if you drop or invert a sign; the answer you get if you forget to apply a correction factor; and the answer you get if you confuse two units. That is why the option that "looks about right" so often is not. If your working lands exactly on one of the offered numbers, that is weak evidence you are correct — the wrong numbers were chosen precisely because people land on them.

The sign trap, specifically

Temperature coefficients are negative. Temperature differences below standard test conditions are also negative. Multiplying two negatives gives a positive, so voltage goes up as it gets colder. Candidates who rush this produce a lower voltage, find that number in the options, and move on satisfied. The worked example is here →

Reading order that saves time

1. Read the last line of the question first. It tells you what is being asked, which tells you which of the given numbers matter.
2. Cover the options and work it out. Looking at four numbers before you have a method pulls you toward whichever one feels familiar.
3. Check the units of your answer against the units in the options. Thirty seconds, and it catches the single most common avoidable error.
4. Flag and move on. Two hours for seventy questions is about a minute forty each. A question you spend six minutes on has cost you three others.

Words that change the answer

"Maximum" and "minimum" usually signal that a correction factor applies — maximum voltage means coldest temperature, maximum current means hottest. "At standard test conditions" means do not correct anything. "Continuous" in a conductor question means the ampacity derating applies. "Nominal" is a label, not a measurement. Each of those words is doing work, and skipping over it is how a candidate who knows the material answers a different question from the one asked.

On guessing

There is no negative marking, so never leave a question blank. If you must guess, eliminate on units and order of magnitude first — an answer three orders of magnitude from plausible is a distractor for somebody who dropped a kilo prefix, and you can discard it without any calculation at all.

Where to practise this

Technique is learned on questions, not on pages about questions. Three worked examples with full reasoning are published free, and the full bank is 140 questions with the working on video at $210 CAD. The question bank →

Common questions