Mechanical Aptitude FREE Mechanical Aptitude Question and Answers 2 — Questions and Answers
Question 1: A wheelbarrow is an example of which class of lever?
- First-class lever
- Second-class lever (Correct answer)
- Third-class lever
- Not a lever
Correct answer: Second-class lever
A wheelbarrow is a second-class lever because the load is between the fulcrum (wheel) and the effort (handles).
Question 2: If two gears are meshed together and the driving gear has 20 teeth while the driven gear has 40 teeth, what is the gear ratio?
- 1:2 (Correct answer)
- 2:1
- 1:4
- 4:1
Correct answer: 1:2
The gear ratio is 20:40, which simplifies to 1:2, meaning the driven gear turns once for every two turns of the driving gear.
Question 3: What happens to the volume of a gas when its temperature increases at constant pressure?
- It decreases
- It stays the same
- It increases (Correct answer)
- It first increases then decreases
Correct answer: It increases
According to Charles's Law, gas volume increases proportionally with temperature when pressure is held constant.
Question 4: A hydraulic press has a small piston with an area of 2 sq in and a large piston with an area of 20 sq in. If 10 lbs of force is applied to the small piston, what force is produced at the large piston?
- 10 lbs
- 50 lbs
- 100 lbs (Correct answer)
- 200 lbs
Correct answer: 100 lbs
Force is multiplied by the ratio of piston areas: 10 × (20/2) = 100 lbs.
Question 5: Which type of belt drive arrangement can reverse the direction of rotation of the driven pulley?
- Open belt drive
- Crossed belt drive (Correct answer)
- Serpentine belt drive
- V-belt drive
Correct answer: Crossed belt drive
A crossed belt drive twists the belt into a figure-eight, causing the driven pulley to rotate in the opposite direction of the driving pulley.
Question 6: A spring with a constant of 50 N/m is compressed 0.2 meters. What is the force stored in the spring?
- 5 N
- 10 N (Correct answer)
- 25 N
- 100 N
Correct answer: 10 N
Using Hooke's Law (F = kx), the force is 50 × 0.2 = 10 N.
Mechanical Aptitude FREE Mechanical Aptitude Question and Answers 2
A wheelbarrow is an example of which class of lever?