AON Mechanical and Spatial Reasoning 1 — Questions and Answers
Question 1: Two gears are connected. Gear A has 40 teeth and Gear B has 20 teeth. If Gear A rotates at 30 RPM, how fast does Gear B rotate?
- 15 RPM
- 30 RPM
- 60 RPM (Correct answer)
- 120 RPM
Correct answer: 60 RPM
RPM ratio is inversely proportional to gear teeth: 30 × (40/20) = 60 RPM.
Question 2: A lever has its fulcrum at the center. A 60 kg weight is placed 2 meters left of the fulcrum. How much force is needed 3 meters to the right to balance it?
- 30 kg
- 40 kg (Correct answer)
- 45 kg
- 50 kg
Correct answer: 40 kg
Torque balance: 60 × 2 = F × 3; F = 120 ÷ 3 = 40 kg.
Question 3: Water flows through a pipe at 10 liters per minute. If the pipe splits into two equal branches, how much flows through each branch?
- 5 liters per minute (Correct answer)
- 8 liters per minute
- 10 liters per minute
- 20 liters per minute
Correct answer: 5 liters per minute
Flow divides equally between two identical branches: 10 ÷ 2 = 5 liters per minute each.
Question 4: A block and tackle system uses 4 rope segments supporting a load. If the load weighs 200 lbs, approximately how much effort force is needed (ignoring friction)?
- 25 lbs
- 50 lbs (Correct answer)
- 100 lbs
- 200 lbs
Correct answer: 50 lbs
Mechanical advantage of a block and tackle = number of rope segments = 4; effort = 200 ÷ 4 = 50 lbs.
Question 5: If you look at a clock showing 3:00, and then see its mirror image, what time does the mirror image show?
- 9:00 (Correct answer)
- 6:00
- 12:00
- 3:00
Correct answer: 9:00
A mirror image of a clock reverses left and right; 3:00 becomes 9:00 in the mirror.
Question 6: A bolt is tightened by turning it clockwise. To loosen the bolt, which direction do you turn it?
- Clockwise
- Counterclockwise (Correct answer)
- Alternating
- Direction does not matter
Correct answer: Counterclockwise
Standard bolts follow the righty-tighty, lefty-loosey rule: counterclockwise loosens.
AON Mechanical and Spatial Reasoning 1
Two gears are connected.
Gear A has 40 teeth and Gear B has 20 teeth.
If Gear A rotates at 30 RPM, how fast does Gear B rotate?