Which of the following best defines a beam in structural engineering?
A A compressive member
B A rigid body that resists torsion
C A member that resists bending
D A member under tensile force
What is the primary function of a pulley system?
A To change the direction of the applied force
B To increase the applied distance
C To reduce friction
D To multiply the input force
What does a truss structure primarily carry?
A Bending moments
B Torsional forces
C Shear forces
D Axial loads
What is the main use of the virtual work principle in mechanics?
A To determine material strength
B To calculate forces in equilibrium
C To measure deflection of beams
D To measure the energy of a system
What is the moment of a force?
A The tendency of a force to rotate an object
B The work done by a force
C The force acting on an object
D The displacement caused by a force
What does hydrostatic pressure depend on?
A The temperature of the fluid
B The volume of the fluid
C The depth of the fluid
D The shape of the container
What is the primary characteristic of a moment couple?
A A force pair that causes deformation
B Produces rotational motion without translation
C Causes translation
D Acts on the same point
What does the mechanical advantage of a simple machine indicate?
A The energy efficiency
B The speed of work
C The distance covered by the load
D The force multiplication
What is the formula for calculating stress?
A Force / Area
B Pressure / Volume
C Force × Distance
D Mass × Acceleration
What does the strain in a material represent?
A The stress on the material
B The resistance to external forces
C The deformation of the material
D The force applied
Which of the following best describes rotational motion?
A Movement of particles in all directions
B Motion about a fixed axis
C Motion along a straight line
D Vibration of particles
Which of the following is a type of simple machine?
A Generator
B Turbine
C Engine
D Lever
What does a free-body diagram show?
A All external forces acting on a body
B Only internal forces
C The material properties of the body
D The total work done
What is the primary use of beams in structural systems?
A To transfer heat
B To resist bending due to applied loads
C To store energy
D To resist compression forces
What is the purpose of a simple machine?
A To reduce energy loss
B To increase the applied force
C To make work easier by changing force or direction
D To store energy