Mettl Technical Aptitude 3 — Questions and Answers
Question 1: Water flows through a pipe at 4 m/s with a diameter of 0.1 m. The pipe narrows to a diameter of 0.05 m. What is the flow velocity in the narrower section?
- 2 m/s
- 8 m/s
- 16 m/s (Correct answer)
- 1 m/s
Correct answer: 16 m/s
By the continuity equation, A₁v₁ = A₂v₂; area ratio = (0.1)²/(0.05)² = 4, so v₂ = 4 × 4 = 16 m/s.
Question 2: In binary, what is the decimal value of 1101?
- 11
- 12
- 13 (Correct answer)
- 14
Correct answer: 13
1101 in binary = 1×8 + 1×4 + 0×2 + 1×1 = 8 + 4 + 0 + 1 = 13.
Question 3: Which type of circuit allows current to flow in only one direction?
- AC circuit
- Rectifier circuit (Correct answer)
- Oscillator circuit
- Bridge circuit
Correct answer: Rectifier circuit
A rectifier circuit converts AC to DC, allowing current to flow in only one direction using diodes.
Question 4: A 10 kg object is on a frictionless surface. A 50 N force is applied. What is the object's acceleration?
- 0.2 m/s²
- 5 m/s² (Correct answer)
- 500 m/s²
- 50 m/s²
Correct answer: 5 m/s²
Newton's second law: a = F/m = 50 N / 10 kg = 5 m/s².
Question 5: What is the purpose of a heat sink in electronic devices?
- Store electrical charge
- Increase circuit speed
- Dissipate heat away from components (Correct answer)
- Regulate voltage
Correct answer: Dissipate heat away from components
A heat sink absorbs and dissipates heat generated by electronic components to prevent overheating.
Question 6: A pulley system has a mechanical advantage of 4. How much effort is needed to lift a 200 N load?
- 800 N
- 50 N (Correct answer)
- 200 N
- 100 N
Correct answer: 50 N
Mechanical advantage = Load / Effort, so Effort = Load / MA = 200 / 4 = 50 N.
Question 7: What does RAM stand for in computer hardware?
- Read Access Memory
- Random Access Memory (Correct answer)
- Rapid Application Memory
- Reusable Array Module
Correct answer: Random Access Memory
RAM stands for Random Access Memory, the volatile memory used for active data and running programs.
Mettl Technical Aptitude 3
Water flows through a pipe at 4 m/s with a diameter of 0.1 m.
The pipe narrows to a diameter of 0.05 m.
What is the flow velocity in the narrower section?