Wiesen Test of Mechanical Aptitude (WTMA) Prep: 60 Questions, 30 Minutes, 6th-Grade Reading Level
The Wiesen is the test that proves mechanical intuition is not a language problem. Every item is written at a 6th-grade reading level on purpose, so the questions do not punish applicants with English as a second language or limited formal schooling. What they do punish is people who have never thought about levers, fluid flow, or gears before. Those candidates can get blown out in the first 10 questions, not because the math is hard but because the intuitions are unfamiliar. The Wiesen is a quick test of whether you can look at a machine and predict what it does next.
What the WTMA is and who built it
The Wiesen Test of Mechanical Aptitude, known widely as the WTMA, is a 60-item mechanical reasoning test delivered in 30 minutes. It was created by Joel Wiesen and is now distributed by multiple test publishers: Criteria Corp uses it as part of their aptitude battery, PAR publishes the original PAR edition, Ramsay Corporation licenses it, and APR Testing Services resells it to industrial employers. The item bank is the same across distributors.
Every question presents a simple drawing of a mechanical situation and asks the test-taker to predict an outcome: which lever requires less force, which valve controls which flow, which pulley lifts a load faster, which gear stops when another gear is locked. The drawings are schematic and clean, similar to a middle-school science textbook illustration.
The 6th-grade reading level is deliberate. Wiesen designed the WTMA for entry-level hiring where applicants may be non-native English speakers or may have limited formal education past high school. The questions therefore test mechanical intuition in as language-neutral a way as possible while still being a written exam.
Concept families tested on every Wiesen WTMA
The WTMA does not split into formal sections. Questions pull from seven mechanical concept families, shuffled in random order across the 60 items.
Basic machines: levers, wedges, screws, wheels
Classic first, second, and third-class levers. Which side of a lever moves further, which side requires less effort. Inclined planes, screws, wedges. Usually 8 to 12 items.
Pulleys and lifting systems
Single fixed pulleys, single movable pulleys, and block-and-tackle arrangements. Counting supporting ropes is the core skill. 6 to 8 items.
Gears and belt drives
Which gear turns faster, which direction. Crossed belts reverse direction, uncrossed belts keep direction. 6 to 8 items.
Gravity and center of gravity
Which object tips over, which way a beam balances, where a ball rolls. The Wiesen has more of these than most mechanical tests. 6 to 10 items.
Basic electricity and electronics
Simple series and parallel circuits, battery polarity, what happens when a wire breaks. Lighter coverage, 4 to 6 items.
Heat transfer and basic fluid flow
Why metal feels colder than wood at the same temperature, which container loses heat faster, fluid flow through pipes of different diameters. 4 to 6 items.
Everyday physical properties
Why ice floats, why a deflating ball bounces lower, how friction changes with surface area. These items use consumer-level scenarios, not industrial machinery. 6 to 10 items.
WTMA scoring: raw score plus percentile rank
The Wiesen returns two numbers: a raw score of correct items out of 60, and a percentile rank comparing the candidate to a norm group that matches the role. Norm groups are role-specific, which matters. A raw score of 40 correct might be the 70th percentile among general-population candidates and only the 40th percentile among a norm group of experienced maintenance technicians.
There is no wrong-answer penalty. Guess on every item you cannot solve within 20 seconds. Blanks cost the same as incorrect answers, so filling every bubble is free expected value. The 30-minute clock gives you exactly 30 seconds per item, which is why pacing is as much a skill on the Wiesen as concept knowledge.
Criteria Corp and other distributors package the WTMA with a recommended passing threshold that the employer sets. Typical entry-level operator roles cut at the 50th percentile. Technician roles at large manufacturers cut at the 70th percentile. Few roles cut higher than the 80th percentile because the WTMA is designed as a screen, not a ceiling test.
Who uses the Wiesen WTMA?
The Wiesen WTMA is used by Criteria Corp clients for technician, machine-operator, and maintenance roles across manufacturing, utilities, logistics, and transit. Employers value the 30-minute length and 6th-grade reading level for high-volume hiring.
A 7-day Wiesen WTMA prep plan
Day 1: Diagnostic and concept map
Take a 60-item timed mock cold. Identify the 2 concept families where you lost the most points. Read a one-page overview of each. Do not solve new problems yet.
Day 2: Levers, pulleys, and basic machines
Learn the two core rules. Levers: effort times distance equals load times distance. Pulleys: more supporting ropes equals less effort needed. 20 practice items, untimed. Review every wrong answer same day.
Day 3: Gears and belt drives
Smaller gear spins faster. Crossed belts reverse direction. Intermediate gears in a chain cancel out for the overall speed ratio. 15 items timed at 30 seconds each.
Day 4: Gravity, balance, and center of gravity
Wide base, low center of gravity equals more stable. Torque equals weight times distance from pivot. 20 items with mixed balance and tipping scenarios.
Day 5: Electricity, heat, fluids, and everyday physics
The lighter concept families. Series versus parallel circuits, which material conducts heat, fluid flow through different pipe sizes, friction basics. 25 mixed items.
Day 6: Full 60-item timed mock
30-minute clock. Do not pause. Record pacing at item 20 and item 40. If you are behind, you will know where your weak spots are. Most first-time candidates freeze at levers and pulleys around item 15 to 20.
Day 7: Error drill and rest
Redo every wrong answer from Day 6 untimed. Re-read the principle that each one tested. Then stop. No more new material. Sleep.
Three WTMA mistakes that drop percentile fast
Over-reading the question
The 6th-grade language is simple for a reason. If a question looks too easy, it probably is. Candidates who hunt for trick wording often talk themselves out of correct answers.
Spending more than 40 seconds on pulley problems
Pulley systems look intimidating but reduce to counting supporting ropes. 3 ropes means 1/3 the effort. 4 ropes means 1/4 the effort. Count and move.
Skipping the everyday-physics category
The household-scenario items (why ice floats, why metal feels cold) are often 6 to 10 of the 60 questions. Candidates who skip this category because it feels unserious lose a full stanine.
Related reading
Wiesen WTMA FAQs
30 seconds per question. Build the intuition before the clock starts.
Timed 60-item WTMA simulations with concept-family feedback and percentile scoring.
Start Wiesen WTMA Practice