Meaning Of Science Terms

A purlin is a longitudinal roof member that provides support and stability to the roof structure. It is typically made of wood or steel and runs parallel to the roof slope, connecting the rafters or trusses. Purlins help distribute the weight of the roof evenly and prevent sagging or structural failure. They also provide a base for attaching the roof covering, such as roofing sheets or tiles. In summary, a purlin is an essential component of a roof system that contributes to its strength and durability.

Intermodal refers to the use of multiple modes of transportation, such as trains, trucks, and ships, to transport goods or people. This approach allows for greater efficiency and flexibility in logistics, as different modes can be used based on their strengths and the specific requirements of the shipment. By combining different transport types, intermodal transportation offers a seamless and integrated solution for moving cargo or passengers across various locations, improving connectivity and reducing costs.

Reverse commuting refers to the act of traveling in the opposite direction of the main flow of traffic during peak commuting hours. This can be done by individuals who live in suburban areas and work in urban areas, or vice versa. By moving opposite the main flow, individuals can potentially avoid heavy traffic and have a quicker and more efficient commute.

A vigilance device refers to a system or mechanism that requires the operator's active control and attention. It ensures that the operator remains alert and attentive while operating a vehicle or machinery. This device may include various features such as alarms, sensors, or timers that prompt the operator to take action or respond to certain conditions. By requiring operator control, the vigilance device helps prevent accidents or mishaps that could occur due to negligence or lack of attention.

The correct answer is "Long Island Railroad." The given options are different interpretations of the acronym "LIRR," but the correct one is the Long Island Railroad.

Booth audit refers to the process of conducting a supervisor funds check. This involves reviewing and verifying the financial transactions and cash handling procedures carried out by the supervisor at a booth or counter. It ensures that the supervisor is properly managing and accounting for the funds under their responsibility. This audit helps to prevent fraud, identify discrepancies, and maintain financial integrity within the organization.

The correct answer is "Time Gap Between Vehicles" because headway refers to the time interval between two consecutive vehicles in a transportation system. It is an important concept in traffic engineering and is used to measure the capacity and efficiency of a transportation system. A shorter headway indicates a higher frequency of vehicles, while a longer headway indicates a lower frequency. Therefore, the correct answer is the option that accurately defines headway as the time gap between vehicles.

The term "circulator bus" refers to a type of bus that operates within a specific locale or area. Unlike long-distance trip buses or water-fueled buses, circulator buses are designed to serve a particular community or neighborhood by providing transportation within that specific area. They are often used to connect residential areas with commercial centers, schools, or other key destinations within the locality. The answer "Serves Specific Locale" accurately describes the meaning of the term "circulator bus".

Ground tackle refers to the equipment used to secure a vessel in place, particularly when anchoring. This includes the anchor itself, as well as the chain or rope used to connect the anchor to the vessel. Ground tackle is essential for safely mooring a boat or ship and preventing it from drifting or being carried away by currents or winds. Therefore, the correct answer is "Anchor And Related Gear."

A Pullman car is made out of a sleeping car. These types of cars are designed to provide comfortable sleeping accommodations for passengers during long train journeys. They typically have private compartments or berths with beds, and sometimes include amenities such as bathrooms and dining areas. The term "Pullman" originated from the Pullman Company, a famous American railroad car manufacturer known for producing luxurious sleeping cars in the late 19th and early 20th centuries.

A rapid transit system requires a distinct right-of-way in order to operate efficiently and provide quick transportation. This means that the transit system has its own dedicated tracks or lanes that are separate from regular traffic, allowing the trains or buses to move freely without being affected by congestion or delays. Having a distinct right-of-way ensures that the rapid transit system can maintain a high level of speed, frequency, and reliability, making it an effective mode of transportation for commuters. The other options listed, such as premium service, rush hour extra routes, and rider surcharge, may enhance the rapid transit system but are not essential for its basic operation.

The correct answer is "Failure Of Bus In Service." This refers to a situation where a bus breaks down or experiences a mechanical failure while in operation. This can disrupt the service and cause delays for passengers.

The correct answer is "Abandoned Interval." In the context of the given options, ABD stands for "Abandoned Interval." This suggests that an "abandoned interval" is a part of the ABD. The other options, such as "Aerial Bus Depot," "Air Brake Deployment," and "All Broken Down," do not align with the given acronym.

Stabling refers to the process of taking a train out of service. This could be done for various reasons such as maintenance, cleaning, or to address any issues with the train. During stabling, the train is removed from the regular schedule and is not available for passengers. It allows for necessary inspections, repairs, and preparations to be carried out before the train can resume its service.

A spur track refers to a track that branches off from the main railway line and leads to a specific destination, such as a factory or a warehouse. It is not used for regular transit purposes but rather for specific purposes like loading and unloading goods. Therefore, the correct answer, "Non-Transit Track," accurately describes what a spur track means.