AP Computer Science Principles Unit 1

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

Which of the following is true about the way digital data is transmitted on the Internet?
Bit-rate (bandwidth) is the time elapsed between the transmission and receipt of a piece of digital data.
Latency is the amount of data (measured in bits) that can be sent in a fixed amount of time.
Digital data can only be transmitted between two devices when they are physically connected to one another (for example by a copper wire)
Two devices must communicate using the same bit-rate to successfully send and receive digital data.

Back

Two devices must communicate using the same bit-rate to successfully send and receive digital data.

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

A video-streaming Web site uses 32-bit integers to count the number of times each video has been played. In anticipation of some videos being played more times than can be represented with 32 bits, the Web site is planning to change to 64-bit integers for the counter. Which of the following best describes the result of using 64-bit integers instead of 32-bit integers?

Back

2^32 times as many values can be represented.

Front

Select the answer that lists the units of bytes in ascending order (from smallest to largest): gigabyte, megabyte, terabyte; megabyte, terabyte, kilobyte; gigabyte, terabyte, megabyte; kilobyte, gigabyte, terabyte

Back

kilobyte, gigabyte, terabyte