Mechanical Engineering MCQs

1. What is the SI unit of force?
A. Joule
B. Newton
C. Watt
D. Pascal
2. Which law states that energy cannot be created or destroyed?
A. Newton's First Law
B. Newton's Second Law
C. First Law of Thermodynamics
D. Second Law of Thermodynamics
3. What type of stress is induced in a body when subjected to equal and opposite forces acting tangentially?
A. Tensile Stress
B. Compressive Stress
C. Shear Stress
D. Bending Stress
4. Which of the following is a refrigerant commonly used in air conditioning systems?
A. Ammonia
B. Methane
C. Carbon Dioxide
D. R-134a
5. What is the function of a flywheel in an engine?
A. Increase torque
B. Reduce speed variations
C. Store fuel
D. Regulate coolant flow
6. Which material is commonly used for making ball bearings?
A. Cast Iron
B. Stainless Steel
C. Aluminum
D. Copper
7. The efficiency of a Carnot engine depends on which factor?
A. Working fluid
B. Temperature difference
C. Friction
D. Lubrication
8. What is the unit of viscosity?
A. Pascal
B. Poise
C. Newton
D. Joule
9. What type of gears are used to transmit power between non-parallel shafts?
A. Spur gears
B. Bevel gears
C. Helical gears
D. Worm gears
10. In fluid mechanics, Bernoulli’s equation is derived from which principle?
A. Law of conservation of mass
B. Law of conservation of energy
C. Law of conservation of momentum
D. Newton's Second Law