Engineering Mechanics MCQs (Part-7)

What is the formula for calculating the efficiency of a machine?

A (Output force / Input force) × 100
B (Input work / Output work) × 100
C (Output work / Input work) × 100
D (Input force / Output force) × 100

Which of the following is true for a cantilever beam?

A It is used only for vertical loads
B It allows rotation at both ends
C It has supports at both ends
D It is fixed at one end and free at the other

What is the formula for calculating the angular acceleration?

A Change in angular velocity / Time
B Force × Distance
C Mass × Acceleration
D Force / Area

Which of the following is true for a truss structure?

A It carries bending moments
B It cannot carry tension
C It carries only axial loads
D It is made of curved members

What is the formula for calculating the coefficient of friction?

A Frictional force / Normal force
B Normal force / Frictional force
C Mass × Acceleration
D Force × Distance

Which of the following is true for a free-body diagram?

A It includes internal forces
B It shows only external forces
C It ignores equilibrium
D It is used only for beams

What is the formula for calculating the center of mass?

A Sum of forces / Total mass
B Sum of moments / Total mass
C Sum of distances / Total volume
D Sum of areas / Total length

Which of the following is true for a rigid body?

A It is only used in fluid mechanics
B It cannot rotate
C It deforms under load
D It has no deformation under load

What is the formula for calculating the angular momentum?

A Force × Distance
B Mass × Acceleration
C Force / Area
D Mass × Velocity × Radius

Which of the following is true for a simply supported beam?

A It has fixed supports at both ends
B It is used only for vertical loads
C It has a hinge support at one end and a roller at the other
D It cannot carry bending moments

What is the formula for calculating the strain energy?

A 1/2 × Stress × Strain × Volume
B Force × Distance
C Mass × Acceleration
D Force / Area

Which of the following is true for a pulley system?

A It changes the direction of force
B It has no mechanical advantage
C It decreases the input force
D It increases the input force

What is the formula for calculating the mechanical advantage of a lever?

A Load arm / Effort arm
B Force × Distance
C Effort arm / Load arm
D Mass × Acceleration

Which of the following is true for a centroid?

A It is the geometric center of an area
B It is the balance point of a body
C It is the same as the center of gravity
D All of the above

What is the formula for calculating the work-energy principle?

A Work done = Change in potential energy
B Work done = Change in kinetic energy
C Work done = Force × Distance
D Work done = Mass × Acceleration