Psychometric Test Psychometric Test Mechanical Reasoning 1 — Questions and Answers
Question 1: Two gears are meshed together. Gear A has 20 teeth and Gear B has 40 teeth. If Gear A rotates at 100 RPM, at what speed does Gear B rotate?
- 200 RPM
- 100 RPM
- 50 RPM (Correct answer)
- 25 RPM
Correct answer: 50 RPM
Gear speed is inversely proportional to tooth count: B spins at 20/40 × 100 = 50 RPM.
Question 2: A lever has a fulcrum in the middle. A 10 kg weight is placed 2 m to the left. To balance it, a 5 kg weight must be placed how far to the right?
- 1 m
- 2 m
- 4 m (Correct answer)
- 5 m
Correct answer: 4 m
Torque balance: 10 kg × 2 m = 5 kg × d, so d = 4 m.
Question 3: Water flows through a pipe that narrows from a 4 cm diameter to a 2 cm diameter. What happens to the water's flow speed?
- It halves
- It doubles
- It quadruples (Correct answer)
- It stays the same
Correct answer: It quadruples
The cross-sectional area decreases by a factor of 4 (radius halved), so by continuity, speed quadruples.
Question 4: A ball is thrown horizontally from a cliff. Ignoring air resistance, which force acts on the ball during flight?
- Only horizontal force
- Only gravity (Correct answer)
- Horizontal force and gravity equally
- No force
Correct answer: Only gravity
After release, only gravity acts on the ball; there is no horizontal force to maintain (Newton's first law).
Question 5: A pulley system has one fixed and one movable pulley. Approximately how much effort is needed to lift a 100 kg load?
- 100 kg
- 50 kg (Correct answer)
- 25 kg
- 200 kg
Correct answer: 50 kg
A single movable pulley gives a mechanical advantage of 2, halving the required effort to about 50 kg.
Question 6: Which type of simple machine is a doorknob?
- Lever
- Wedge
- Wheel and axle (Correct answer)
- Inclined plane
Correct answer: Wheel and axle
A doorknob is a wheel and axle — the large knob is the wheel and the spindle is the axle.
Psychometric Test Psychometric Test Mechanical Reasoning 1
Two gears are meshed together.
Gear A has 20 teeth and Gear B has 40 teeth.
If Gear A rotates at 100 RPM, at what speed does Gear B rotate?