Mechanical Engineering MCQs
Mechanical Engineering MCQs for competitive exams in Pakistan cover thermodynamics, fluid mechanics, machine design, manufacturing, and materials. Ideal for PPSC, FPSC, NTS, and university tests, they help students and professionals enhance concepts and problem-solving skills.
Q: Cast iron is widely used because of its
A) High strength
B) Good machinability
C) Ductility
D) High toughness
✅ Correct Answer: B
Explanation: Cast iron is easy to cast and machine.
Q: The angle between two surfaces of a cutting tool is called
A) Clearance angle
B) Rake angle
C) Helix angle
D) Relief angle
✅ Correct Answer: B
Explanation: Rake angle affects the cutting efficiency and chip flow.
Q: Velocity ratio in a screw jack is
A) Always less than 1
B) Always more than 1
C) Equal to 1
D) Zero
✅ Correct Answer: B
Explanation: Due to the mechanical advantage of threads, the velocity ratio is greater than 1.
Q: Newton’s second law is concerned with
A) Force and acceleration
B) Velocity and mass
C) Acceleration and inertia
D) Friction and reaction
✅ Correct Answer: A
Explanation: Newton's second law: Force = Mass × Acceleration.
Q: First law of thermodynamics is the law of
A) Energy conservation
B) Ideal gases
C) Friction
D) Entropy
✅ Correct Answer: A
Explanation: It states energy can neither be created nor destroyed.