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  2. AP World History: Modern - Wikipedia

    en.wikipedia.org/wiki/AP_World_History:_Modern

    In 2012, the head of AP Grading, Trevor Packer, stated that the reason for the low percentages of 5s is that "AP World History is a college-level course, & many sophomores aren't yet writing at that level." 10.44 percent of all seniors who took the exam in 2012 received a 5, while just 6.62 percent of sophomores received a 5.

  3. Advanced Placement exams - Wikipedia

    en.wikipedia.org/wiki/Advanced_Placement_exams

    Advanced Placement (AP) examinations are exams offered in United States by the College Board and are taken each May by students. The tests are the culmination of year-long Advanced Placement (AP) courses, which are typically offered at the high school level. AP exams (with few exceptions [1]) have a multiple-choice section and a free-response ...

  4. Time signal - Wikipedia

    en.wikipedia.org/wiki/Time_signal

    A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. Church bells or voices announcing hours of prayer gave way to automatically operated chimes on public clocks; however, audible signals (even signal guns) have limited range

  5. Automatic Warning System - Wikipedia

    en.wikipedia.org/wiki/Automatic_Warning_System

    An AWS visual indicator (known as the 'sunflower') An AWS audible indicator (capable of producing two different sounds, clear indication sound = bell, warning indication sound = 'horn', or electronic equivalents) An AWS Acknowledge button (used to acknowledge the audible AWS warning indication.

  6. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Morse code can be transmitted in a number of ways: Originally as electrical pulses along a telegraph wire, but later extended to an audio tone, a radio signal with short and long tones, or high and low tones, or as a mechanical, audible, or visual signal (e.g. a flashing light) using devices like an Aldis lamp or a heliograph, a common ...

  7. Alarm device - Wikipedia

    en.wikipedia.org/wiki/Alarm_device

    The word alarm comes from the Old French a l'arme meaning "to the arms", or "to the weapons", telling armed men to pick up their weapons and get ready for action because an enemy may have suddenly appeared. [1] The word alarum is an archaic form of alarm. It was sometimes used as a call to arms in the stage directions of Elizabethan dramas. [2]

  8. AP Art and Design - Wikipedia

    en.wikipedia.org/wiki/AP_Art_and_Design

    Unlike traditional AP exams that utilize a multiple-choice section, free response section, and occasionally an audio section, the AP Studio Art Exam is a portfolio that encompasses three different categories: Quality, Concentration, and Breadth. Depending on the AP Studio Art exam the person is taking, the components for each of the three ...

  9. AP United States History - Wikipedia

    en.wikipedia.org/wiki/AP_United_States_History

    The AP U.S. History exam lasts 3 hours and 15 minutes and consists of two sections, with the first (Section I) being divided into two parts. Section I part A includes 55 multiple-choice questions with each question containing four choices.