D684 Introduction to Computer Science - Set 5 - Part 1

Correct Answer: Multi-touch sensing

Multi-touch sensing detects and tracks multiple simultaneous contact points, enabling several visitors to interact independently without interference.
Option a is incorrect because single-touch sensing only registers one contact point, preventing multiple visitors from interacting simultaneously.
Option c is incorrect because pressure sensing measures force but doesn't distinguish multiple separate touch points from visitors.
Option d is incorrect because motion sensing detects movement in space but not specific touch interactions on exhibit surfaces.

Correct Answer: Digital verification

Digital verification uses cryptographic codes for instant authentication, preventing counterfeits while processing thousands of fans quickly through gates.
Option a is incorrect because manual inspection is too slow for thousands of fans and susceptible to sophisticated counterfeit tickets.
Option c is incorrect because visual checking can be fooled by high-quality counterfeits and slows entry into the stadium.
Option d is incorrect because random sampling allows counterfeit tickets through unchecked, compromising venue security and revenue protection.

Correct Answer: Shortest path

Shortest path algorithms calculate optimal routes through shelf layouts, minimizing robot travel time for efficient book retrieval.
Option a is incorrect because random paths waste time with unnecessary movement, delaying book retrieval for waiting library patrons.
Option c is incorrect because circular paths follow fixed routes regardless of book location, increasing retrieval time unnecessarily.
Option d is incorrect because zigzag paths cover all areas systematically but inefficiently for retrieving specific individual books.

Correct Answer: Accelerometer patterns

Accelerometer patterns show distinctive rhythms for walking versus smooth motion of vehicles, enabling accurate step counting and activity recognition.
Option a is incorrect because temperature patterns don't distinguish between walking and riding in vehicles for step counting.
Option c is incorrect because light patterns vary with environment but don't indicate whether someone is walking or driving.
Option d is incorrect because sound patterns are unreliable for detecting walking movements and distinguishing from vehicle travel.

Correct Answer: Constraint satisfaction

Constraint satisfaction problems balance multiple requirements and limitations to find optimal solutions, matching hotel room assignment complexity.
Option b is incorrect because pattern matching identifies recurring features but doesn't optimize assignments with multiple competing constraints.
Option c is incorrect because data sorting arranges information in order but doesn't solve complex assignment optimization problems.
Option d is incorrect because signal processing analyzes waveforms and frequencies, unrelated to room assignment optimization challenges.

Correct Answer: Computer vision

Computer vision identifies birds through visual characteristics and movement patterns, enabling appropriate avoidance maneuvers to protect wildlife.
Option a is incorrect because radar might not detect small birds reliably or distinguish them from other flying objects.
Option c is incorrect because sound detection is unreliable in windy conditions and many birds fly silently.
Option d is incorrect because heat detection might miss birds at ambient temperature and can't identify them specifically.

Correct Answer: Pattern analysis

Pattern analysis identifies suspicious similarities in language, timing, and behavior that distinguish fake reviews from genuine customer feedback.
Option a is incorrect because length analysis alone can't determine authenticity since fake reviews can match typical lengths.
Option c is incorrect because color analysis applies to images, not text-based review content requiring authenticity verification.
Option d is incorrect because size analysis doesn't apply to review text authenticity detection for marketplace products.

Correct Answer: Conflict-free scheduling

Conflict-free scheduling ensures trains never require the same platform simultaneously, preventing dangerous situations and operational delays.
Option a is incorrect because random scheduling would cause platform conflicts, creating dangerous situations and massive delays.
Option c is incorrect because sequential scheduling underutilizes platforms by allowing only one train at a time.
Option d is incorrect because parallel scheduling without coordination would cause trains to need same platforms simultaneously.

Correct Answer: Lambda architecture

Lambda architecture combines real-time stream processing with batch processing, enabling immediate trend detection while maintaining historical accuracy.
Option a is incorrect because batch architecture processes data in intervals, missing real-time trends as they emerge.
Option c is incorrect because monolithic architecture creates single applications, not optimized for distributed stream processing needs.
Option d is incorrect because static architecture doesn't support the dynamic processing required for real-time trend analysis.

Correct Answer: Geometric calculation

Geometric calculations compare vehicle dimensions with space measurements, determining whether the car can fit safely with clearance.
Option a is incorrect because speed calculation relates to motion but doesn't determine if vehicles fit in parking spaces.
Option c is incorrect because weight calculation doesn't determine spatial fit for parking, only load-bearing capacity needs.
Option d is incorrect because temperature calculation is irrelevant to determining whether cars fit in parking spaces.

Correct Answer: Private matching

Private matching calculates compatibility without revealing personal information until both users express mutual interest, protecting privacy.
Option a is incorrect because public matching exposes user information broadly, violating privacy expectations in dating applications.
Option c is incorrect because open matching implies unrestricted access to user data, compromising privacy and safety.
Option d is incorrect because broadcast matching sends information widely, violating privacy principles for sensitive dating data.

Correct Answer: Alpha blending

Alpha blending combines overlapping colors using transparency values, creating natural smooth transitions like real paint mixing.
Option a is incorrect because binary rendering only shows full color or nothing, preventing smooth color blending effects.
Option c is incorrect because block rendering creates discrete sections without the smooth transitions needed for natural blending.
Option d is incorrect because line rendering draws edges and outlines, not the area blending required for brushwork.

Correct Answer: Continuous scanning

Continuous scanning reads barcodes while moving, maximizing throughput by eliminating stops and maintaining constant robot motion through warehouses.
Option a is incorrect because stop-and-scan requires halting at each package, dramatically reducing warehouse scanning efficiency.
Option c is incorrect because manual scanning requires human operators, defeating the purpose of automated inventory robots.
Option d is incorrect because periodic scanning misses packages between scan intervals, creating incomplete inventory records.

Correct Answer: Trajectory analysis

Trajectory analysis tracks movement paths to identify people approaching the door versus those passing by on sidewalks.
Option a is incorrect because distance analysis alone can't determine intent since sidewalks may be close to doors.
Option c is incorrect because color analysis of clothing doesn't indicate whether someone intends to approach the door.
Option d is incorrect because size analysis doesn't reveal movement intent or distinguish visitors from passing pedestrians.

Correct Answer: Dynamic routing

Dynamic routing recalculates paths when routes become blocked, directing people to safe available exits during emergencies.
Option a is incorrect because static routing cannot adapt when fire or debris blocks predetermined evacuation paths.
Option c is incorrect because manual routing requires human intervention, too slow during rapidly evolving emergency situations.
Option d is incorrect because default routing uses fixed paths that may lead people toward danger if blocked.

Correct Answer: Adaptive difficulty

Adaptive difficulty adjusts challenges based on performance, keeping users engaged in optimal learning zones without frustration or boredom.
Option a is incorrect because fixed difficulty becomes too easy or hard as users progress, reducing learning effectiveness.
Option c is incorrect because maximum difficulty frustrates beginners, causing them to abandon language learning entirely.
Option d is incorrect because minimum difficulty bores advanced users, preventing progress and reducing motivation to continue.

Correct Answer: Signal interference

Signal interference combines waves from multiple telescopes constructively, synthesizing larger effective apertures for improved image resolution.
Option a is incorrect because signal averaging reduces noise but doesn't increase resolution beyond individual telescope capabilities.
Option c is incorrect because signal amplification increases strength but doesn't improve resolution of astronomical observations.
Option d is incorrect because signal reduction decreases information, worsening rather than improving image resolution quality.

Correct Answer: Spectral analysis

Spectral analysis examines light wavelengths reflected by plants, revealing disease signatures invisible to normal color photography.
Option b is incorrect because structural analysis examines shapes but misses color-based disease indicators in crop leaves.
Option c is incorrect because temporal analysis tracks changes over time but doesn't identify current disease states.
Option d is incorrect because audio analysis processes sound, completely unrelated to visual crop disease detection.

Correct Answer: Queueing model

Queueing models mathematically predict wait times using arrival rates and service capacity, providing accurate estimates for park visitors.
Option b is incorrect because graphics models render visual content, not predicting wait times for theme park attractions.
Option c is incorrect because storage models manage data persistence, unrelated to predicting attraction wait time calculations.
Option d is incorrect because compilation models translate code, not relevant to estimating theme park queue times.

Correct Answer: Optical amplification

Optical amplification uses special fibers to boost light signals directly without converting to electricity, ideal for underwater cables.
Option a is incorrect because electronic amplification requires electrical power and components vulnerable to underwater pressure and corrosion.
Option c is incorrect because mechanical amplification involves physical movement, impractical for optical signals in submarine cables.
Option d is incorrect because thermal amplification would damage fiber optics and doesn't boost optical signal strength.