Polytechnic Engineering Fundamentals 1 — Questions and Answers
Question 1: What is Ohm's Law?
- V = IR (Correct answer)
- V = I/R
- V = I + R
- V = I²R
Correct answer: V = IR
Ohm's Law states that voltage equals current multiplied by resistance: V = IR.
Question 2: Which of the following best describes stress in engineering mechanics?
- Force per unit area (Correct answer)
- Force times displacement
- Mass times acceleration
- Energy per unit volume
Correct answer: Force per unit area
Stress is defined as the internal force acting per unit cross-sectional area within a material.
Question 3: What is Newton's Second Law of Motion?
- F = ma (Correct answer)
- F = mv
- F = m/a
- F = m + a
Correct answer: F = ma
Newton's Second Law states that the net force on an object equals its mass multiplied by its acceleration.
Question 4: What is the unit of electrical resistance?
- Ohm (Ω) (Correct answer)
- Volt (V)
- Ampere (A)
- Watt (W)
Correct answer: Ohm (Ω)
Electrical resistance is measured in ohms (Ω), named after physicist Georg Simon Ohm.
Question 5: What does the Young's Modulus (E) measure?
- Stiffness of a material (Correct answer)
- Hardness of a material
- Ductility of a material
- Thermal conductivity
Correct answer: Stiffness of a material
Young's Modulus is the ratio of stress to strain and measures the stiffness (elasticity) of a material.
Question 6: In a series circuit, how is total resistance calculated?
- R_total = R1 + R2 + R3 + ... (Correct answer)
- 1/R_total = 1/R1 + 1/R2 + ...
- R_total = R1 × R2 × R3
- R_total = R1 - R2
Correct answer: R_total = R1 + R2 + R3 + ...
In a series circuit, resistances simply add together to give the total resistance.
Polytechnic Engineering Fundamentals 1
What is Ohm's Law?