Mechanical Reasoning Test Practice
A mechanical reasoning test asks how simple machines and forces behave: where a lever balances, which way a gear turns, what effort a pulley system needs, how pressure travels through a liquid. It measures applying a few physical rules, not recalling facts. Trades, maintenance, technician and military roles use it to judge how quickly you will learn equipment.
A mechanical reasoning test, sometimes called a mechanical aptitude or mechanical comprehension test, puts a small machine in front of you and asks what it will do. Which way does the last gear turn? How hard must you pull on a block and tackle? What weight balances a plank? Each question comes down to one idea: a gain in force is paid for in distance.
You do not need to have studied physics, but you do need a handful of rules and the habit of applying them in order. Moments for levers, tooth counts for gears, rope sections for pulleys, force over area for pressure, and stretch in proportion to pull for springs cover most of what appears.
This page works every sample question out in words, so each one is solvable from the text alone. Treat them the way you would treat the real test: write the rule first, then the numbers, then check that the answer is the right size and the right way round. JobCannon has a full mechanical reasoning test to take once you have worked through these.
The format at a glance
- Format
- Multiple-choice questions describing or drawing a simple machine, in words, pictures, or both
- Time limit
- Timed; the limit is set by each employer or publisher, so read your invitation before you plan a pace
- Question types
- Levers and balance, gear trains, pulley systems, springs, and pressure in liquids and gases
- Scoring
- Marked right or wrong; whether a wrong answer loses marks varies by test, so check the instructions
- Who uses it
- Skilled trades, maintenance and repair, manufacturing, engineering technician roles, and military selection, where the ASVAB includes a Mechanical Comprehension subtest (source)
What it measures
Levers and balance
This is the ability to see where a bar will turn and what stops it. A lever balances when the turning effect on one side of the pivot equals the turning effect on the other, and that effect is force times distance from the pivot. Wrenches, wheelbarrows, pliers and crowbars are the same question in different clothes, which is why employers who hire people to work with tools like to see it.
Gears and rotation
These items ask for a speed, a direction or a turning force at the end of a chain of gears. The tooth count sets the speed ratio, meshed gears turn opposite ways, and two gears on one shaft turn together. It is a direct preview of reading a gearbox, a drive train or a lathe's change gears.
Pulleys and springs
Here the question is how a load is shared. In a block and tackle the load is divided between the rope sections that support it, and in a spring pair it is divided or passed on depending on whether the springs sit side by side or end to end. Rigging, lifting equipment, suspension and tool design all rest on this.
Fluids and pressure
These questions use pressure as force spread over an area. Depth sets the pressure in a liquid, a squeezed gas pushes back harder, and a hydraulic system trades force for distance through the ratio of two piston areas. That is the logic of brakes, jacks, presses and compressors.
Practice questions with worked answers
Written by us to mirror the published format. Work each one out before you read the explanation — the method is the part that transfers, the answer is not.
- Q1lever-balance
A light plank is balanced on a pivot. A 300 N weight hangs 0.8 m to the left of the pivot, and a second weight hangs 1.2 m to the right of it. How heavy is the second weight?
- 150 N
- 200 N
- 360 N
- 450 N
Correct answer
200 N. The plank balances when the two turning effects are equal. On the left, 300 x 0.8 = 240 N m. On the right, W x 1.2 = 240, so W = 200 N. The weight on the longer arm has to be the lighter one, which rules out 360 N and 450 N. The 450 N option comes from flipping the ratio: 300 x 1.2 / 0.8.
- Q2gear-train
A large gear with 40 teeth turns at 90 rpm and drives a small gear with 18 teeth. How fast does the small gear turn, and in which direction compared with the large gear?
- 40 rpm, turning the opposite way round
- 200 rpm, turning the same way
- 40 rpm, turning the same way as the large gear
- 200 rpm, turning the opposite way
Correct answer
200 rpm, turning the opposite way. The small gear has fewer teeth, so it has to turn faster to keep up: 90 x 40 / 18 = 200 rpm. Two gears that mesh directly always turn in opposite directions. The 40 rpm options come from turning the tooth ratio upside down, which would make the small gear slower than the large one.
- Q3pulley-system
A lifting rig has six rope sections supporting the load. A worker pulls 3 m of rope through the rig. Ignoring friction, how far does a 1,200 N load rise, and what effort holds it?
- 0.5 m, 200 N
- 0.5 m, 1,200 N
- 18 m, 200 N
- 3 m, 7,200 N
Correct answer
0.5 m, 200 N. Six sections share the load, so the effort is 1,200 / 6 = 200 N. The load rises one sixth of the rope pulled: 3 / 6 = 0.5 m. Check with work: 200 N x 3 m = 600 N m, the same as 1,200 N x 0.5 m. The 1,200 N option ignores the pulleys, 18 m multiplies the distance where it should divide, and 7,200 N multiplies the force.
- Q4fluid-pressure
A diver is 12 m below the surface of fresh water. Take the density of the water as 1,000 kg per cubic metre and gravity as 10 N per kg. What pressure does the water alone exert on the diver?
- 12 kPa
- 100 kPa
- 120 kPa
- 1,200 kPa
Correct answer
120 kPa. Pressure in a liquid is density x gravity x depth: 1,000 x 10 x 12 = 120,000 Pa, which is 120 kPa. The 12 kPa and 1,200 kPa options are slips of a factor of ten, and 100 kPa is roughly the pressure of the atmosphere, which this question did not ask about.
- Q5hydraulics
In a sealed hydraulic system, the output piston has ten times the area of the input piston. The input piston is pushed 20 cm. How far does the output piston move?
- 20 cm
- 10 cm
- 200 cm
- 2 cm
Correct answer
2 cm. The liquid cannot be squeezed, so the volume pushed out of the small cylinder equals the volume entering the large one. A piston with ten times the area moves one tenth as far: 20 / 10 = 2 cm. The output force is ten times larger, and the force gained is paid for in distance.
- Q6spring-combination
Two identical springs hang end to end from a hook, one below the other. A 10 N weight on the lower spring stretches the pair by 6 cm in total. How far would one of those springs alone stretch under the same 10 N?
- 6 cm
- 3 cm
- 12 cm
- 1.5 cm
Correct answer
3 cm. Hung end to end, each spring carries the whole 10 N, and the stretches add up. The total of 6 cm is therefore shared equally, 3 cm each. A single spring under 10 N stretches 3 cm. The 6 cm option is the pair's total, and 12 cm and 1.5 cm come from doubling or halving a second time.
How scores are read
Rule first, then the numbers
You write down which rule applies, substitute with units, and check the answer for size and direction. This is the habit that holds up under a clock, though exact cut-offs are set by each employer and publisher, not by a public scale.
Right method, slips in the arithmetic
You pick the correct rule but lose marks to a dropped factor or a unit mix-up, such as using square centimetres with square metres. Writing the unit on every number is the usual fix.
Right rule, wrong way round
You know the ratio but apply it upside down, so the small gear comes out slower or the longer lever arm needs more force. A one-line sense-check on direction catches this, and it is worth drilling until it is automatic.
Guessing on multi-step items
Single-step questions go well, but compound gear trains or levers with several loads are answered by default guess. Writing each stage on its own line is the target for focused practice.
Try the free JobCannon Mechanical Reasoning Test
Sit a full-length version under the clock and get a scored report you keep, so the next practice session works on the gap rather than on everything at once.
Start the free test25 questions · 9 min · No signup to start
How to prepare
Name the trade first
Nearly every machine swaps force for distance or for speed. Saying which one in a few words tells you which rule to reach for, and tells you in advance whether the answer should be bigger or smaller than what you were given.
Write the rule before the numbers
Put the equation on paper first: effort x effort arm = load x load arm, or speed out = speed in x teeth in / teeth out. A rule on the page cannot be forgotten halfway through the arithmetic, and it makes the next step mechanical.
Measure from the pivot
On any lever the distances that count run from the pivot to each force. Mark the pivot first and label each arm before multiplying. Measuring from the end of the bar is the most common lever error.
Count rope sections, not wheels
In a pulley system, trace the rope with a finger and count only the sections that pull on the moving block. The number of wheels is a distraction, and the free end only counts if it comes off the moving block.
More teeth means slower
In any pair of meshed gears the one with more teeth turns more slowly. If your answer breaks that rule, you have the ratio upside down. It takes two seconds to check and removes the most common gear mistake.
Convert units before you divide
A square metre is ten thousand square centimetres. Mixing the two puts an answer out by that factor, and wrong options are often built to look exactly like that slip. Convert first, then divide.
Sense-check, then eliminate
Ask whether the answer should be larger or smaller than the figure you started from, and whether work in equals work out. Any option that fails the check can be removed, which often leaves two to choose between.
It is a multiple-choice test of how simple machines and forces behave. Questions cover levers, gears, pulleys, springs and the pressure of liquids and gases, and each is solved by applying a short list of physical rules rather than recalling facts.
The names are used loosely and often mean the same thing: reasoning about forces and simple machines. Some publishers say mechanical comprehension, as the ASVAB does for its Mechanical Comprehension subtest. Check the description in your invitation rather than relying on the name.
Skilled trades, maintenance and repair, manufacturing, engineering technician roles and military entry commonly use them, because the work involves understanding how equipment behaves. Not every employer in these fields tests, so the invitation is the only information that applies to you.
You do not need a physics course, but you do need the handful of rules covered above and comfortable arithmetic with ratios and units. The tests ask you to apply a rule to a setup, not to derive it.
Many employer tests draw the machine, while others describe it in words. The rules are the same either way, so practise turning a drawing into the words you would have been given: find the pivot, count the rope sections, trace the drive from gear to gear.
Learn one machine at a time, write the rule before the numbers on every question, and keep a short log of your mistakes. Then move to mixed sets and finally timed ones, so that accuracy comes first and speed second.
No claim is made. It is original practice material with no published norms and no reliability or validity study, so it shows how you handled these questions and nothing about a specific employer's test. It is a good way to find out which machines you need to revise.
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