Fundamentals of Engineering Basic 2 — Questions and Answers
Question 1: A vector has components Fx = 3 N and Fy = 4 N. What is the magnitude of the resultant force?
- 5 N (Correct answer)
- 7 N
- 3.5 N
- 12 N
Correct answer: 5 N
The magnitude is found using the Pythagorean theorem: √(3² + 4²) = √25 = 5 N.
Question 2: Which of the following best describes a scalar quantity?
- Temperature (Correct answer)
- Velocity
- Force
- Displacement
Correct answer: Temperature
Temperature has magnitude only, with no direction, making it a scalar; the others are vectors.
Question 3: What is the unit of pressure in the SI system?
- Pascal (Pa) (Correct answer)
- Newton (N)
- Joule (J)
- Watt (W)
Correct answer: Pascal (Pa)
Pressure is force per unit area; 1 Pascal equals 1 N/m².
Question 4: A 10 kg object is accelerated at 3 m/s². What net force is required?
- 30 N (Correct answer)
- 3.33 N
- 13 N
- 0.3 N
Correct answer: 30 N
Newton's second law states F = ma = 10 kg × 3 m/s² = 30 N.
Question 5: Which law states that for every action there is an equal and opposite reaction?
- Newton's Third Law (Correct answer)
- Newton's First Law
- Newton's Second Law
- Hooke's Law
Correct answer: Newton's Third Law
Newton's Third Law of Motion describes action-reaction force pairs.
Question 6: The kinetic energy of a 2 kg object moving at 6 m/s is:
- 36 J (Correct answer)
- 12 J
- 24 J
- 72 J
Correct answer: 36 J
KE = ½mv² = ½ × 2 × 6² = ½ × 2 × 36 = 36 J.
Question 7: Which of the following is a unit of energy?
- Joule (Correct answer)
- Watt
- Pascal
- Newton
Correct answer: Joule
The Joule (J) is the SI unit of energy; Watt is power, Pascal is pressure, Newton is force.
Fundamentals of Engineering Basic 2
A vector has components Fx = 3 N and Fy = 4 N.
What is the magnitude of the resultant force?