AP CSP Khan Academy and Quia Review exam with complete solutions

Which logic gate will invert a single value? NOT gate Character Hexadecimal Chart A:41 B:42 C:43 D:44 E:45 F:46 What is the binary equivalent of the hexadecimal number for the character "F"? It's your friend's birthday, and you want to use binary numbers for the candles on their cake. Your plan is to use green candles to mean "on" and gray candles to mean "off". What's the least number of candles you need in order to represent the age 18? 5 bits The diagram below shows a circuit with three gates, where the output from two OR gates are sent into a final AND gate. The circuit has four inputs (A, B, C, D), two for each OR gate. If the final output is 0, what is a possible state of the inputs A/B/C/D? A = 0, B = 1, C = 0, D = 0 The Apple iPhone includes a settings menu where you can toggle various accessibility options on or off: What is the minimum number of bits that can represent those 2 options? 2 bits Alejandro wants to explain the importance of file extensions to his friend. Which of these explanations is the best? When a file has an extension, the computer can decide what application to open it in. Peter wants to make a computer, but doesn't have the money to buy a CPU. He only has the money for a keyboard, RAM (Random Access Memory), and monitor. Why is the CPU important? Without a CPU, the computer can't process the data that comes from the keyboard. Tom is recording an album of songs using a digital audio recording application, and he wants the recordings to be high quality. Which advice will best help him to achieve his goal? He should save the audio using a lossless compression algorithm. Pixar is a company that creates a huge amount of images, audio recordings, and videos, and they need to decide what compression algorithms to use on all those files. When would Pixar most