Mettl Technical Aptitude 4 — Questions and Answers
Question 1: Which gate produces a HIGH output only when ALL inputs are HIGH?
- OR gate
- NAND gate
- AND gate (Correct answer)
- NOR gate
Correct answer: AND gate
An AND gate outputs HIGH (1) only when all of its inputs are HIGH, otherwise it outputs LOW.
Question 2: A spring with a spring constant of 200 N/m is compressed by 0.05 m. How much potential energy is stored?
- 0.25 J (Correct answer)
- 5 J
- 10 J
- 0.5 J
Correct answer: 0.25 J
Spring PE = ½kx² = ½ × 200 × (0.05)² = ½ × 200 × 0.0025 = 0.25 J.
Question 3: In object-oriented programming, what is 'encapsulation'?
- Inheriting methods from a parent class
- Bundling data and methods that operate on that data within one unit (Correct answer)
- Creating multiple objects from one class
- Overriding a method in a subclass
Correct answer: Bundling data and methods that operate on that data within one unit
Encapsulation bundles data (attributes) and the methods that act on it into a single class, hiding internal details.
Question 4: Which material is classified as a semiconductor?
- Copper
- Rubber
- Silicon (Correct answer)
- Steel
Correct answer: Silicon
Silicon is a semiconductor — its conductivity falls between conductors and insulators and can be controlled by doping.
Question 5: Two resistors of 6Ω and 3Ω are connected in parallel. What is the total resistance?
- 9 Ω
- 4.5 Ω
- 2 Ω (Correct answer)
- 18 Ω
Correct answer: 2 Ω
For parallel resistors: 1/R = 1/6 + 1/3 = 1/6 + 2/6 = 3/6 = 1/2, so R = 2 Ω.
Question 6: What is the main advantage of a screw as a simple machine?
- It increases the speed of work
- It converts rotational force into linear motion with a mechanical advantage (Correct answer)
- It reduces friction completely
- It stores potential energy
Correct answer: It converts rotational force into linear motion with a mechanical advantage
A screw converts rotational (torque) input into linear motion, providing a large mechanical advantage over short distances.
Question 7: Which protocol is primarily used for sending email messages?
- HTTP
- FTP
- SMTP (Correct answer)
- DNS
Correct answer: SMTP
SMTP (Simple Mail Transfer Protocol) is the standard protocol used for sending email between servers.
Mettl Technical Aptitude 4
Which gate produces a HIGH output only when ALL inputs are HIGH?