# Engineering Mechanics Viva Questions

- What is the difference between statics and dynamics in engineering mechanics?
- Define force and its units.
- What is the principle of superposition of forces?
- What is the difference between a scalar and a vector quantity? Give examples.
- Explain the concept of moment of a force and its units.
- State the conditions of equilibrium for a rigid body.
- What is a couple? How does it differ from a force?
- Define the term ‘friction’ and explain the different types of friction.

- What is the law of conservation of energy?
- What is the difference between elastic and inelastic collisions?
- Explain the concept of work and energy.
- What is meant by the term ‘center of mass’?
- What is the difference between centroid and center of mass?
- Explain the concept of torque and its relationship with angular acceleration.
- What is meant by the term ‘moment of inertia’?
- State the law of conservation of momentum and its significance.
- Explain the concept of projectile motion.
- What is Hooke’s law?

- Explain the concept of stress and strain.
- What is the difference between tensile and compressive stress?
- Explain the concept of shear stress and its applications.
- Define modulus of elasticity and its units.
- What is the Poisson’s ratio? How is it calculated?
- What is the difference between a beam and a column?
- Explain the concept of bending moment and shear force in a beam.
- What is the difference between a scalar and a vector quantity? Give examples.

- Explain the concept of moment of a force and its units.
- State the conditions of equilibrium for a rigid body.
- What is a couple? How does it differ from a force?
- Define the term ‘friction’ and explain the different types of friction.
- What is the law of conservation of energy?
- What is the difference between elastic and inelastic collisions?
- Explain the concept of work and energy.
- What is meant by the term ‘center of mass’?
- What is the difference between centroid and center of mass?
- Explain the concept of torque and its relationship with angular acceleration.
- What is meant by the term ‘moment of inertia’?
- State the law of conservation of momentum and its significance.
- Explain the concept of projectile motion.
- What is Hooke’s law?
- Explain the concept of stress and strain.
- What is the difference between tensile and compressive stress?
- Explain the concept of shear stress and its applications.
- Define modulus of elasticity and its units.
- What is the Poisson’s ratio? How is it calculated?
- What is the difference between a beam and a column?
- Explain the concept of bending moment and shear force in a beam.

- What is the difference between a statically determinate and indeterminate structure?
- What is the difference between a truss and a frame?
- Define the term ‘deflection’ and its units.
- What is the relationship between load, bending moment, and deflection in a beam?
- What is the difference between a concentrated and a distributed load?
- What is the principle of virtual work?
- What is the difference between a cantilever and a simply supported beam?
- What is the difference between a rigid and a deformable body?
- Define the term ‘moment’ and its units.
- What is the principle of virtual work and how is it used in engineering mechanics?

- What is the difference between static and dynamic equilibrium?
- What is a free-body diagram?
- What is the difference between a scalar and a vector quantity?
- Explain the concept of a force vector and its components.
- What is the difference between a force and a torque?
- Define the term ‘moment arm’ and how it is related to torque.
- Explain the concept of a couple and how it differs from a single force.

- What is the difference between kinetic and potential energy?
- What is the work-energy principle?
- What is the difference between a conservative and a non-conservative force?
- What is the law of conservation of energy and how is it used in engineering mechanics?
- What is the difference between an elastic and an inelastic material?

- Define the term ‘strain’ and its units.
- Explain the concept of stress and its units.
- What is the difference between tensile and compressive stress?
- What is the difference between shear stress and normal stress?
- What is the difference between a beam and a cantilever?
- Explain the concept of beam bending and how it is related to bending moment.
- What is the difference between a simply supported and a fixed beam?

- Define the term ‘deflection’ and its units.
- Explain the concept of thermal stress and how it is calculated.
- What is the difference between a reversible and an irreversible process in thermodynamics?
- What is entropy and how is it related to the second law of thermodynamics?
- What is the Carnot cycle and why is it important in thermodynamics?

- What is the difference between a heat engine and a heat pump?
- Define the term ‘heat transfer’ and its units.
- What is the difference between work and power?
- What is the difference between a conservative and a non-conservative force?
- What is the difference between an elastic and an inelastic material?
- Explain the concept of strain energy and its importance in engineering mechanics.
- What is the difference between a truss and a frame?
- What is the difference between a statically determinate and indeterminate structure?

- What is the difference between a concentrated and a distributed load?
- What is the difference between a cantilever and a simply supported beam?
- What is the difference between a closed and an open system in thermodynamics?
- What is the difference between a heat engine and a heat pump?
- What is the difference between conduction and convection heat transfer?
- What is the difference between shear stress and tensile stress?
- Explain the concept of thermal expansion and how it is related to temperature change.
- What is Hooke’s law and how is it applied in engineering mechanics?

- Define the term ‘yield strength’ and its units.
- What is the difference between ultimate strength and yield strength?
- What is the difference between ductile and brittle materials?
- What is the difference between strain and deformation?
- Define the term ‘stress concentration’ and its causes.
- What is the difference between a bending moment and a twisting moment?
- What is the difference between a centroid and a center of gravity?
- What is the difference between a static and a dynamic load?
- Explain the concept of a stress-strain curve and its importance in material testing.

- What is the difference between a tensile and a compressive load?
- What is the difference between a strain gauge and a load cell?
- Define the term ‘fatigue failure’ and its causes.
- What is the difference between a bolt and a screw?
- What is the difference between a beam and a column?
- Explain the concept of a statically determinate structure and give an example.
- What is the difference between an internal and an external force?
- Define the term ‘couple moment’ and its importance in structural analysis.
- What is the difference between a statically indeterminate and determinate structure?

- What is the difference between a beam and a truss?
- What is the difference between a pinned and a fixed support?
- What is the difference between a reaction force and a shear force?
- Define the term ‘deflection’ and its importance in structural analysis.
- What is the difference between a moment of inertia and a second moment of area?
- What is the difference between a statically determinate and indeterminate beam?
- What is the difference between a continuous and a simple beam?
- Explain the concept of an eccentric load and its effects on a structure.

- Define the term ‘torsion’ and its units.
- What is the difference between a shear force and a bending moment?
- What is the difference between a simply supported and a cantilever beam?
- What is the difference between a tension and compression member in a truss?
- What is the difference between a concentrated and a distributed load on a beam?
- Explain the concept of an influence line and its use in structural analysis.

- What is the difference between a concentrated and a distributed load on a truss member?
- What is the difference between a force and a pressure?
- Define the term ‘bulk modulus’ and its units.
- What is the difference between a shear modulus and a Young’s modulus?
- What is the difference between a torsional shear stress and a bending shear stress?
- What is the difference between a beam and a plate?
- Explain the concept of a plate bending and its relation to bending moment.
- What is the difference between a simply supported and a fixed plate?

- What is the difference between a rectangular and a circular plate?
- Define the term ‘principal stress’ and its importance in structural analysis.
- What is the difference between a stress and a strain?
- What is the difference between a moment and a torque?
- Define the term ‘shear flow’ and its importance in beam design.
- What is the difference between a statically determinate and indeterminate frame?