Mettl Technical Aptitude 2 — Questions and Answers
Question 1: A gear with 40 teeth meshes with a gear with 10 teeth. If the smaller gear rotates at 200 RPM, what is the RPM of the larger gear?
- 50 RPM (Correct answer)
- 100 RPM
- 800 RPM
- 400 RPM
Correct answer: 50 RPM
Gear ratio = 10/40 = 1/4, so the larger gear rotates at 200 × (10/40) = 50 RPM.
Question 2: Which material has the highest electrical conductivity at room temperature?
- Copper
- Silver (Correct answer)
- Gold
- Aluminum
Correct answer: Silver
Silver has the highest electrical conductivity of any element, though copper is more commonly used due to cost.
Question 3: In a hydraulic system, if the input piston has an area of 2 cm² and the output piston has an area of 20 cm², and a force of 100 N is applied to the input, what is the output force?
- 10 N
- 100 N
- 1000 N (Correct answer)
- 200 N
Correct answer: 1000 N
Pascal's principle: Output force = Input force × (Output area / Input area) = 100 × (20/2) = 1000 N.
Question 4: A program uses a stack data structure. Items are pushed in order: A, B, C. What is the order they are popped?
- A, B, C
- C, B, A (Correct answer)
- B, A, C
- A, C, B
Correct answer: C, B, A
A stack follows LIFO (Last In, First Out), so C is popped first, then B, then A.
Question 5: What does the acronym API stand for in software development?
- Automated Program Interface
- Application Programming Interface (Correct answer)
- Applied Protocol Integration
- Advanced Process Instruction
Correct answer: Application Programming Interface
API stands for Application Programming Interface, a set of rules allowing software components to communicate.
Question 6: A transformer has 200 primary turns and 50 secondary turns. If the primary voltage is 240V, what is the secondary voltage?
- 120 V
- 960 V
- 60 V (Correct answer)
- 480 V
Correct answer: 60 V
Turns ratio = 50/200 = 1/4, so secondary voltage = 240 × (50/200) = 60 V.
Question 7: Which type of lever has the fulcrum positioned between the effort and the load?
- Second-class lever
- Third-class lever
- First-class lever (Correct answer)
- Fourth-class lever
Correct answer: First-class lever
A first-class lever has the fulcrum between effort and load, like a seesaw or crowbar.
Mettl Technical Aptitude 2
A gear with 40 teeth meshes with a gear with 10 teeth.
If the smaller gear rotates at 200 RPM, what is the RPM of the larger gear?