To pass a mechanical reasoning test, relearn the handful of physics principles the questions are built on (levers, pulleys, gears, springs, pressure and circuits) until you can apply them without stopping to think, then practise full tests under the clock. On the day, work out your own answer from the diagram before you look at the options, check your units, and move on from any question that is eating your time. Unlike most aptitude tests, this one rewards revision directly, so a week or two of focused preparation can make a real difference.
Start by sitting a timed free mechanical reasoning test to see which topics cost you marks. The tips below take you from there to test day.
1. Find out which test you are sitting
Mechanical tests come from several publishers, and they differ in length, timing and how much they rely on industrial equipment rather than everyday objects. The Bennett Mechanical Comprehension Test is one long-established example, and other major publishers have their own versions. Ask the recruiter which assessment you have been invited to, then look up its format and time limit. The physics is the same across them, so this shapes how you practise rather than what you revise.
2. Match the topics to the role
Read the job description and note the mechanical ideas it mentions. A maintenance role may lean on gears, belts and hydraulics; an electrical role will put more weight on circuits. Tests are often matched to the work, so this list tells you where your revision time is best spent.
3. Revise the principles, not memorised answers
Learn each rule in a form you can apply to a diagram you have never seen. The core set is short:
- Levers: load × distance from pivot = effort × distance from pivot.
- Pulleys: effort = load ÷ number of rope sections supporting the moving block.
- Gears: meshed gears turn in opposite directions, and speed is inversely proportional to the number of teeth.
- Belts: same speed rule as gears; an open belt keeps the direction, a crossed belt reverses it.
- Springs: stretch is proportional to force; in series the stretch adds up, in parallel the load is shared.
- Pressure: force ÷ area, the same throughout a sealed fluid, and greater with depth in a liquid.
- Circuits: voltage = current × resistance; one break stops a series circuit, but parallel branches carry on.
- Work: machines trade force for distance but never create energy.
Our guide to mechanical reasoning topics explains each of these with an example.
4. Keep your units straight
Note the units before you calculate and check your answer carries the right ones. A length in millimetres used as though it were centimetres is one of the most common avoidable errors.
Example. A 50 N force pushes on a piston with an area of 200 mm². What is the pressure in N per cm²?
- Convert the area: 100 mm² = 1 cm², so 200 mm² = 2 cm².
- Pressure = 50 ÷ 2 = 25 N per cm².
If you had used 200 as if it were in cm², you would get 50 ÷ 200 = 0.25, which is wrong by a factor of 100. Test writers often include that wrong figure as an option.
5. Read every diagram in the same order
Build a fixed routine: find the input, follow the force or motion through each part, then reread the question to check what it actually asks. A consistent order stops you answering a question about direction when it was about speed. Keep scrap paper to hand if you are allowed it, because sketching a linkage is easier than holding it in your head.
6. Treat the answer options as suspects
Wrong options are written to catch the obvious slip: the gear turning the wrong way, the ratio upside down, or the force before the pulley’s advantage is applied. Work out your own answer first, then look for it.
Example. Four gears are meshed in a row. The first turns clockwise. Which way does the fourth turn?
Direction alternates along the row: clockwise, anticlockwise, clockwise, anticlockwise. The fourth gear turns anticlockwise. An option showing clockwise is there for anyone who assumes the last gear copies the first.
7. Practise complete tests under timed conditions
Pacing and fatigue only show up over a whole test. Sit complete practice tests end to end with the clock running, and treat each score as information about what to work on next, not as a verdict.
8. Drill the topics you get wrong
Review each practice test by topic, not just by score. If pulleys are costing you marks, work on pulleys on their own until the counting rule is automatic, then go back to mixed tests. For worked questions on each topic, see our mechanical reasoning examples.
9. Budget your time, and move on when stuck
Divide the time limit by the number of questions to find your working pace. For example, 40 questions in 25 minutes gives 25 × 60 ÷ 40 = 37.5 seconds each. If a question resists you, pick the best supported option and move on, unless the test penalises wrong answers. An easy question you never reach costs the same mark as a hard one you could not crack.
10. Set up properly on the day
These tests are usually taken online. Check your internet connection, use an up-to-date browser, and clear your desk before you start. Read the instructions in full, including whether a calculator is allowed, and do any practice questions offered at the start. Sleep well the night before rather than cramming.
Know what you are being tested on
If you are new to this kind of test, it helps to understand what mechanical reasoning is and why employers use it before you start revising. Then keep a simple record of your scores by topic across your practice sessions, so you can see which areas are improving and which still need the time.
When you are ready, take a timed mechanical reasoning practice test and compare your score by topic with your first attempt.
