Bridges

What are the three basic types of bridges mentioned in the video?

• Beam, Cable-stayed, and Suspension

• Beam, Arched, and Suspension

• Truss, Arched, and Cantilever

• Beam, Truss, and Cable-stayed

Answer explanation

The correct answer is 'Beam, Arched, and Suspension' as these are the three basic types of bridges discussed in the video. Each type has distinct structural characteristics and uses.

Which type of bridge is described as the strongest in the video?

• Beam bridge

• Arched bridge

• Suspension bridge

• Truss bridge

Answer explanation

The video describes the suspension bridge as the strongest type due to its ability to span long distances and support heavy loads through its cables, making it more resilient compared to other bridge types.

What is the primary factor that determines the design of a bridge according to the video?

• The color of the bridge

• The length of the bridge

• The cost, length, and weight it needs to bear

• The location of the bridge

Answer explanation

The primary factor that determines the design of a bridge is the cost, length, and weight it needs to bear. These elements are crucial for ensuring the bridge's safety and functionality.

How does an arch bridge manage the forces acting on it?

• By concentrating force at the center

• By dissipating force over a wide area

• By using cables to transfer force

• By using piers to support the weight

Answer explanation

An arch bridge manages forces by dissipating them over a wide area. The curved shape of the arch allows it to distribute weight and pressure evenly, reducing stress on any single point and enhancing stability.

What is the role of trusses in beam bridges as described in the video?

• To add aesthetic value

• To dissipate force

• To increase the length of the bridge

• To reduce the cost of construction

Answer explanation

Trusses in beam bridges are designed to dissipate force, distributing loads efficiently across the structure. This enhances stability and strength, making the bridge safer and more durable.

In a suspension bridge, where is the force of tension primarily transferred?

• To the piers

• To the abutments

• To the cables

• To the deck

Answer explanation

In a suspension bridge, the force of tension is primarily transferred to the cables. The cables support the weight of the deck and distribute the forces to the piers and abutments, but the tension itself is in the cables.

What happens to the material under tension according to the video?

• It gets shorter

• It gets longer

• It remains the same

• It becomes denser

Answer explanation

When a material is subjected to tension, it experiences elongation. This means that the correct answer is 'It gets longer', as tension causes the material to stretch rather than shorten or remain the same.

What is the function of abutments in an arch bridge?

• To support the cables

• To anchor the deck

• To displace force

• To increase the span

Answer explanation

Abutments in an arch bridge are crucial as they displace the forces exerted by the arch. They transfer the load from the arch to the ground, ensuring stability and structural integrity.

Which force is responsible for pulling everything on the earth's surface towards its center?

• Tension

• Compression

• Gravity

• Friction

Answer explanation

Gravity is the force that pulls everything towards the center of the Earth, keeping objects grounded. It is the fundamental force responsible for the attraction between masses.

What is a span in the context of bridges as described in the video?

• The height of the bridge

• The width of the bridge

• The length of a single bridge segment between two piers

• The total length of the bridge

Answer explanation

In bridge terminology, a span refers specifically to the length of a single bridge segment that is supported by two piers. This distinguishes it from the total length or width of the bridge.