APCSP Practice Test Questions And Answers 2022/2023

What is the best explanation for digital data is represented in computers in binary? A. The binary number system is the only number system flexible enough to allow for representing data other than numbers. B. As a consequence of history: early pioneers of computing were making secret codes in binary, and this simply evolved into modern computing. C. It's impossible to build a computer machine that uses anything but binary to represent numbers. D. It's easier, cheaper, and more reliable to build machines and devices that only have to distinguish between binary states. - Answer - D. It's easier, cheaper, and more reliable to build machines and devices that only have to distinguish between binary states. What is the 4-bit number for the decimal number ten (10)? A. 0010 B. 1010 C. 0110 D. 0101 - Answer - B. 1010 What is the minimum number of bits you would need to encode the 26 letters of the alphabet plus a space - a total of 27 characters? A. 2 bits B. 3 bits C. 5 bits D. 6 bits - Answer - C. 5 bits The next questions refers to the hexidecimal (base 16) number system: Number bases, including binary, decimal, and hexadecimal, are used to view and represent digital data. Which of the following is NOT true about representing digital data? A. At one of the lowest levels of abstraction, all digital data can be represented in binary using only combinations of the digits zero and one. B. Hexadecimal is used to represent digital data because hexadecimal representation uses only 1 digit to represent groups of 4 binary digits. C. Binary can be used to represent more complex, higher level abstractions, including but not limited to numbers, characters, and colors. D. There is a limit to the number of things that can be represented in binary data at which point switching to hexadecimal representation is necessary. - Answer - D. There is a limit to the number of things that can be represented in binary data at which point switching to hexadecimal represen