Real-World Applications Quiz On Induced Topology In Metric Spaces

1) When a fitness tracking app restricts a user’s location data to only one building, the app models that building as a subspace of the Earth’s metric space.

True

False

True, because the building inherits its metric and topology as a subspace of the Earth’s metric space.

Explanation

True, because the building inherits its metric and topology as a subspace of the Earth’s metric space.

2) If a delivery service only needs to measure distances within a specific city district, the distances used inherit the same metric from the entire city’s map.

True

False

True—the district uses the restricted metric, so it becomes a metric subspace.

Explanation

True—the district uses the restricted metric, so it becomes a metric subspace.

3) In navigation apps, restricting attention to “roads accessible to motorcycles” yields a topology that may have more open sets than the topology on the full road network.

True

False

True—subspaces can have more open sets relative to themselves (e.g., disconnected components become open in the subspace).

Explanation

True—subspaces can have more open sets relative to themselves (e.g., disconnected components become open in the subspace).

4) When modeling Wi-Fi coverage in a mall, if the app restricts calculations only to the 3rd floor, the open sets representing “good signal zones” must correspond exactly to open sets in the whole mall.

True

False

False—open sets in the 3rd-floor subspace are intersections of mall-wide open signal regions with the 3rd floor, not necessarily open in the whole mall.

Explanation

False—open sets in the 3rd-floor subspace are intersections of mall-wide open signal regions with the 3rd floor, not necessarily open in the whole mall.

5) A weather app focusing only on a coastal region still treats local temperature neighborhoods as intersections of large-scale open temperature regions with that coastal subset.

True

False

True—this is precisely how subspace topology works.

Explanation

True—this is precisely how subspace topology works.

6) In traffic flow modeling, if the system restricts to a single highway, then sections of the highway are open in the induced topology only if they are open intervals in the full 2D road network.

True

False

False—sections of the highway are open if they equal (open set in 2D) ∩ (the highway curve), not necessarily open in 2D.

Explanation

False—sections of the highway are open if they equal (open set in 2D) ∩ (the highway curve), not necessarily open in 2D.

7) A drone navigation system that operates only on a flight corridor may treat some “safe zones” as open in the induced topology, even if they are not open in the full 3D airspace.

True

False

True—subspace-open sets need not be open in the ambient space.

Explanation

True—subspace-open sets need not be open in the ambient space.

8) In modeling contagion spread on a university campus, restricting analysis to one building yields closures of sets based on global campus spread, not building-level behavior.

True

False

False—the closure in the subspace uses only sequences and open sets inside the building.

Explanation

False—the closure in the subspace uses only sequences and open sets inside the building.

9) A ride-hailing app restricts service to a gated village Y ⊂ X. Which sets represent open service areas in Y?

Intersections of open city neighborhoods with the village

Any subset of the village

City-wide regions not intersecting the village

The entire village

Open sets in Y are exactly U ∩ Y where U is open in X; Y itself is always open in Y.

Explanation

Open sets in Y are exactly U ∩ Y where U is open in X; Y itself is always open in Y.

Submit

10) A mall management system models "cleaning zones" inside the mall. Which zones are open in the induced topology on one floor Y?

A hallway region that is open in the full mall

The entire floor

A store interior that is not open in the full mall

Intersection of an open service radius with the floor

Open sets are intersections of mall-open sets with the floor; the floor itself is open in its subspace topology.

Explanation

Open sets are intersections of mall-open sets with the floor; the floor itself is open in its subspace topology.

Submit

11) A logistics system only considers warehouses along a coastline. Which represent open neighborhoods in the induced topology on the coastline?

Open arcs of the coastline

Single isolated points

Intersections of open 2D regions with the coastline

Unions of several separated coastline segments

Subspace-open sets correspond to arcs or unions of arcs; singletons are not open.

Explanation

Subspace-open sets correspond to arcs or unions of arcs; singletons are not open.

Submit

12) A self-driving car operates only on a circular track. Which areas are open in the induced topology on the track?

Any continuous arc of the track

The whole track

A single checkpoint on the track

Intersection of a circular open ring in the plane with the track

Arcs and intersections of ambient open sets with the track are open; single points are not.

Explanation

Arcs and intersections of ambient open sets with the track are open; single points are not.

Submit

13) A food-delivery app restricts service to a triangular district Y ⊂ ℝ². Which sets are open in the induced topology?

Interior regions of the triangle

Open disks intersected with the triangle

The triangle boundary by itself

Regions formed by cutting out smaller open discs inside the triangle

Open sets come from intersections of ambient open sets with Y. The boundary alone is not open.

Explanation

Open sets come from intersections of ambient open sets with Y. The boundary alone is not open.

Submit

14) A drone uses an altitude constraint Y = {(x,y,z): 10 ≤ z ≤ 12}. Which subsets represent open flight zones?

Horizontal slices where z = 10

Intersections of 3D open balls with Y

The entire layer Y

Subsets containing boundary points but formed from ambient 3D open sets

Intersections with ambient open sets are open; horizontal slices are not open.

Explanation

Intersections with ambient open sets are open; horizontal slices are not open.

Submit

15) A wildlife tracking system considers animals moving along a river curve Y ⊂ ℝ². Which represent open habitat zones in Y?

Connected curve segments

Single locations

Intersections of open 2D regions with the curve

The entire curve

Segments and intersections with open sets are open; single points are not.

Explanation

Segments and intersections with open sets are open; single points are not.

Submit

Real-World Applications Quiz on Induced Topology in Metric Spaces