Which of these is NOT a natural structure?

• Cave

• Bridge

• Tree

• Mountain

Why must all structures be built to withstand a load?

• To look nice

• To be strong

• To be tall

• To be colorful

Which type of load does not change or changes very slowly?

• Dead load

• Wind load

• Live load

• Dynamic load

What type of load is always moving or changing?

• Live load

• Permanent load

• Dead load

• Static load

What forces act on the top and bottom of surfaces of a beam loaded from above?

• Tension and compression

• Shear and torsion

• Bending and twisting

• Pulling and pushing

Where should a beam be reinforced to strengthen its ability to handle a load on its top surface?

• Underneath

• On the sides

• At the ends

• In the middle

What is a tie?

• A type of beam

• A structural element in tension

• A decorative item

• A type of knot

What is the difference between a tie and a strut?

• A tie is in tension, a strut is in compression

• A tie is in compression, a strut is in tension

• A tie is horizontal, a strut is vertical

• A tie is vertical, a strut is horizontal

What type of bridge uses a series of triangular frames to support the roadbed?

• Suspension bridge

• Arch bridge

• Truss bridge

• Beam bridge

From what two materials are bridges most commonly built?

• Wood and plastic

• Steel and concrete

• Brick and stone

• Glass and aluminum