AP CSP - Unit 1 Review

Front

What is the best explanation for why digital data is represented in computers in binary?

Back

It's easier, cheaper, and more reliable to build machines and devices that only have to distinguish between binary states.

Front

What is the 4-bit binary number for the decimal number Ten (10)?

Back

1010

Front

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?

Back

5 Bits

Front

Which of the following is NOT true about representing digital data?
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.
The same value (number) can have a different representation depending on the number system used to represent it.
Groups of bits can be used to represent abstractions, including but not limited to numbers and characters.
Some large numbers cannot be represented in binary and can only be represented in decimal.

Back

Some large numbers cannot be represented in binary and can only be represented in decimal.

Front

Consider the following three binary numbers: 01010, 010000, 1110. Which of the following lists the numbers in order from least to greatest?

Back

01010, 1110, 010000

Front

8 bits is enough to represent 256 different numbers. How many total bits do you need to represent 512 (twice as many) numbers?

Back

9 Bits

Front

How many more values can be represented in an 8-bit message than a 4-bit message?

Back

16 times as many values

Front

______ is a simplified representation of something more complex. It allows you to hide details to help you manage complexity, focus on relevant concepts, and reason about problems at a higher level.

Back

Abstraction

Front

This number system has a symbol to represent each of the values 0-15? Options: Binary Number System, Decimal Number System, Hexadecimal Number System, Octal Number System

Back

Hexadecimal Number System

Front

Which of the following is TRUE regarding lossless and lossy compressions? An example of lossless compression is a .jpg file, Lossless uses inexact approximations while lossy does not· , You can completely reconstruct lossless but not lossy compression · , You can completely reconstruct lossy but not lossless compression

Back

You can completely reconstruct lossless but not lossy compression ·