16 free Mechanical Aptitude questions from our 150-question bank, grouped by content domain. Each answer explains why the right option is right — and why every wrong option is wrong.
Which ball hits the floor first?
Answer: C
A: A drops straight down and looks like the shorter trip, but its downward fall is exactly the same as B's.
B: B's sideways push does not speed up its fall; it only carries B farther from the stand.
They land at the same time: Correct. Both start with no downward speed from the same height, and gravity pulls them down the same way, so they land together.
Sideways motion does not change how fast an object falls.
As the cart suddenly starts moving right, which way does the ball swing?
Answer: A
Left: Correct. The cart and its post jump forward, but the ball tends to stay where it was, so it swings back toward the left.
Right: Reversed: the ball does not lead the cart; its inertia makes it lag behind as the cart speeds up.
It will not swing: The string is tied to the moving post, so when the post moves out from over the ball, the ball swings.
When something starts moving suddenly, loose objects on it lag behind because of inertia.
Which bookcase is most likely to tip over when bumped?
Answer: A
A: Correct. The heavy books sit on the top shelf, so the center of weight is highest and a small tilt carries it past the edge of the base.
B: The books in B are lower than in A, which keeps its center of weight lower and makes it steadier than A.
C: C has the books on the bottom shelf, giving the lowest center of weight; it is the hardest to tip, not the easiest.
The higher the heavy part of an object sits, the less it has to tilt before it tips over.
Which ramp needs less push to roll the cart up?
Answer: C
A: A is wrong: its ramp is longer, but it is just as steep as B, and the longer length only means a longer trip.
B: B is wrong: its dock is lower, which means less total work, but the push needed at each moment is the same as on the equally steep ramp A.
There is no difference: Correct. Both ramps rise one unit for every two units across, so they are equally steep, and the push needed depends only on steepness.
The push needed on a ramp depends on how steep it is, not on how high it goes.
Which valve handle is easier to turn?
Answer: A
A: Correct. A: the long lever handle lets the hand push far from the valve stem, so it turns the stem with much less force than the small knob.
B: B is wrong: the knob is compact, but the hand works close to the stem, so more force is needed.
There is no difference: No difference is wrong: the valves are the same, but the handles give very different leverage.
A longer handle on a turning shaft needs less force.
With the same squeeze, which pliers press hardest on the wire?
Answer: B
A: A is wrong: the wire is at the very tip, farthest from the pivot, so the jaws press on it with the least force.
B: Correct. B: the wire sits right next to the pivot while the hands stay at the handle ends, so the jaws press hardest there.
C: C is wrong: the wire is closer to the pivot than in A but still farther than in B, so the grip is weaker than in B.
Pliers grip hardest close to the pivot; that is why heavy cutting is done deep in the jaws.
The motors run at the same speed. Which driven pulley turns fastest?
Answer: C
A: A has the largest driven pulley, which looks powerful, but it is twice the motor pulley's size, so it turns at half the motor's speed.
B: B has the biggest pulleys overall, but they are equal, so the driven pulley only matches the motor's speed.
C: Correct. C's driven pulley is half the size of its motor pulley, so it turns twice as fast as the motor.
Belt speed depends on the size ratio of the pulleys: the smaller the driven pulley compared with the drive pulley, the faster it turns.
With equal motor speeds, which back wheel makes more turns each second?
Answer: C
A: A's big wheel makes the car travel farther per turn, but it does not change how many turns the wheel makes.
B: B’s small wheel looks like it should spin faster, but how many turns it makes is set by its axle gear, not its size.
There is no difference: Correct. The same motor gear drives the same axle gear in both cars, and each wheel turns with its axle gear, so both wheels make the same number of turns each second.
A wheel fixed to a gear's axle turns at that gear's speed, no matter how large the wheel is.
Both drill cranks turn at the same speed. Which drill bit spins faster?
Answer: C
A: A has the smaller bit gear, but its crank gear is smaller too; both drives are two-to-one.
B: B has the larger crank gear, which looks faster, but its bit gear is larger too; both drives are two-to-one.
There is no difference: Correct. In each drill the crank gear has twice as many teeth as the bit gear, so each bit turns twice for every crank turn.
Gear speed depends on the size ratio between the two gears, not on how big the gears are overall.
In the music box, which way does gear 3 turn?
Answer: A
Clockwise: Correct. Gear 1 turns clockwise, so gear 2 turns counterclockwise and gear 3 turns clockwise again.
Counterclockwise: Counterclockwise is the direction of gear 2, the middle gear; gear 3 reverses it once more.
It will not turn: The three gears simply mesh in a row, so nothing locks them; gear 3 turns.
Meshed gears turn in opposite directions, so in a row of gears every other gear turns the same way.
Which boat will float lowest in the water?
Answer: C
A: A is wrong: with no anchor at all, boat A is the lightest load and rides highest.
B: B is wrong: B carries the anchor, but the water pushes up on the hanging anchor, so the boat itself has to hold up less weight than C.
C: Correct. Boat C must hold the anchor’s full weight, while B’s hanging anchor is partly held up by the water, and A carries no anchor.
An object hanging in water is partly held up by the water, so it loads its boat less than the same object on deck.
Which toy boat will sit lower in the bathtub water?
Answer: A
A: Correct. A floating boat sinks until it pushes aside water equal to its own weight, and the blocks make boat A heavier.
B: B is wrong: the empty boat is lighter, so it needs to push aside less water and rides higher.
There is no difference: No difference is wrong: the boats are the same, but only one carries extra weight.
A floating object sinks until it displaces its own weight of water, so a heavier load rides lower.
Which watering can can be filled to a higher water level?
Answer: C
A: A is wrong: its body is taller, but once the water reaches the spout tip it pours out of the spout.
B: B is wrong: its body is smaller, but its spout tip is at the same height as A’s, so the level stops at the same place.
Both fill to the same level: Correct. The spout and the body are connected, so the water rises in both together and spills from each spout tip at the same height.
In connected vessels the water stands at one level, so the lowest open top sets how high it can go.
Which way will the dye just above the flame move first?
Answer: A
Up: Correct. The water above the flame warms, becomes lighter than the cooler water around it, and rises, carrying the dye up.
Down: Down is wrong: warmed water rises; it is the cooler water elsewhere that sinks.
It will not move: It will not move is wrong: heating one spot sets up a convection current.
Heated water and air rise and cooler fluid sinks to replace them, forming a convection current.
In which circuit will each bulb glow the dimmest?
Answer: B
A: A is wrong: a single bulb gets the whole battery and glows at full brightness.
B: Correct. B: the two bulbs are in series in one loop and share the battery, so each glows dimmer than a bulb alone.
C: C is wrong: each parallel bulb has its own direct path to the battery and glows as brightly as a bulb alone.
Series bulbs share the battery and dim; parallel bulbs each glow as brightly as one bulb alone.
Which bulb in this circuit will glow brighter?
Answer: C
Bulb A: Bulb A is wrong: being closer to the battery does not give a bulb more current in a single loop.
Bulb B: Bulb B is wrong: the current does not get "used up" by Bulb A before reaching Bulb B.
Both are equally bright: Correct. In a single series loop the same current flows through every part, so identical bulbs glow equally bright wherever they sit.
In a series loop the same current passes through each part, so identical bulbs match in brightness.
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