A mechanical comprehension test shows you diagrams of everyday mechanisms and asks you to work out what will happen. This guide explains the principles behind the questions, works through generic examples, summarises the research, and gives practical advice for candidates and employers.

What a mechanical comprehension test measures

Engineers, technicians, maintenance staff, drivers, operators and apprentices all need a practical feel for how things work: which way a gear will turn, how much force a lever saves, why a spring stretches more under one load than another. Mechanical comprehension is the ability to apply these basic physical principles to real situations.

The Viewpoint Mechanical Comprehension Test has 32 items in 20 minutes, arranged as 8 question sets of 4 questions, each set on a different mechanical concept. Topics include weights on scales, circuits, springs, wheels and cogs, pulleys and water in containers. All questions are multiple choice.

The test does not require a qualification in physics or engineering. It rewards clear thinking about cause and effect, and the ability to picture what a mechanism will do.

Worked examples

The following are generic illustrations written for this article, not items from the Viewpoint test.

Gears. Three gears sit in a row, each touching the next. The first turns clockwise. Which way does the third turn? Each pair of touching gears turns in opposite directions, so the second turns anticlockwise and the third clockwise. A quick rule: in a simple chain, gears in odd positions turn the same way as the first, and gears in even positions turn the opposite way.

Gear size. A small gear with 10 teeth drives a large gear with 30 teeth. If the small gear makes 6 turns, how many does the large gear make? The teeth that pass must be equal on both, so 6 × 10 = 60 teeth, and 60 ÷ 30 = 2 turns. The larger gear turns more slowly but with more turning force.

Pulleys. A load of 100 kg hangs from a single movable pulley supported by two lengths of rope. Ignoring friction, roughly how much force is needed to lift it? The weight is shared between the two supporting ropes, so about half the force is needed, though you have to pull twice as much rope. This trade-off between force and distance runs through levers, pulleys and gears alike.

Levers. On a see-saw, a 40 kg child sits 2 metres from the pivot. Where must a 20 kg child sit to balance it? Weight × distance must be equal on each side: 40 × 2 = 80, so the lighter child sits 80 ÷ 20 = 4 metres from the pivot.

What research says

Mechanical aptitude tests have been used in selection for technical and manufacturing roles for many decades. Muchinsky's study of manufacturing employees found that mechanical comprehension tests predicted job performance well, and added to the prediction given by general ability tests [1]. Bertua, Anderson and Salgado's UK meta-analysis also found that ability tests, including mechanical tests, predicted job performance and training success [2].

Research has also found average group differences on mechanical tests, often linked to differences in prior exposure to mechanical tasks rather than underlying ability. That is a reason to use the test where the job genuinely requires mechanical understanding, to offer practice questions to everyone, and to combine results with other evidence.

Using a mechanical comprehension test well

For employers, the test is most valuable for engineering apprenticeships, maintenance and technical roles, production and operational jobs, and roles such as train driving where understanding equipment matters. Interpret scores in bands from Very Low to Very High, and explore lower scores at interview, for example by asking how a candidate has learned to use new equipment.

For candidates, revise the basic principles: gear direction and speed, levers and balance, pulleys, springs and simple circuits. Do the practice questions, read each diagram carefully, and look for the key principle before calculating.

See the Mechanical Comprehension Test page, our Fault Finding Test for diagnosing faults in systems, or all our ability tests.

Frequently asked questions

How long does the Viewpoint Mechanical Comprehension Test take?

It has 32 items and a time limit of 20 minutes.

Do I need an engineering background?

No. The questions use basic principles that can be worked out from the diagrams, and practice questions are available before the test.

What topics are covered?

Weights on scales, circuits, springs, wheels and cogs, pulleys, and water in containers.

Which roles is it used for?

Engineering, technical, maintenance, operational and apprentice roles, and other jobs where understanding equipment matters.

References

1. Muchinsky, P. M. (1993). Validation of intelligence and mechanical aptitude tests in selecting employees for manufacturing jobs. Journal of Business and Psychology, 7(4), 373–382.
2. Bertua, C., Anderson, N. & Salgado, J. F. (2005). The predictive validity of cognitive ability tests: a UK meta-analysis. Journal of Occupational and Organizational Psychology, 78(3), 387–409.