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: Stress distribution in a cantilever beam under uniform load is maximum at which end?
A) Midspan
B) Fixed end
C) Free end
D) Neutral axis
✅ Correct Answer: B
Explanation: Bending stress is highest at the fixed end due to maximum bending moment.
Q: Hooke’s law is valid within which mechanical region?
A) Strain hardening
B) Elastic
C) Fracture
D) Plastic
✅ Correct Answer: B
Explanation: Hooke’s law applies when stress is directly proportional to strain in the elastic region.
Q: Which law governs the heat transfer by conduction?
A) Fourier's Law
B) Newton’s Law
C) Planck’s Law
D) Pascal’s Law
✅ Correct Answer: A
Explanation: Fourier’s Law defines how heat flows through a medium by conduction.
Q: Is entropy a property that increases or decreases in irreversible processes?
A) Zero
B) Increases
C) Constant
D) Decreases
✅ Correct Answer: B
Explanation: In an irreversible process, entropy always increases as per the second law of thermodynamics.
Q: Thermodynamic efficiency of Carnot engine depends on which parameters?
A) Reservoir temperatures
B) Mass flow rate
C) Entropy change
D) Cylinder pressure
✅ Correct Answer: A
Explanation: Efficiency depends on the temperature of the heat source and sink only.