CodeHS Unit 8: Digital Information

What is binary code and how is it used to represent digital information?

• Binary code is a system of representing numbers, letters, and symbols using only two options: 0 and 1. It is used to represent digital information by encoding data into a series of 0s and 1s.

• Binary code is a system of representing numbers, letters, and symbols using only one option: 0. It is used to represent digital information by encoding data into a series of 0s.

• Binary code is a system of representing numbers, letters, and symbols using only three options: A, B, and C. It is used to represent digital information by encoding data into a series of these letters.

• Binary code is a system of representing numbers using 3 options: 0, 1, and 2. It is used to represent digital information by encoding data into a series of 0s, 1s, and 2s.

Explain the concept of encoding and decoding in the context of digital information.

• Encoding is the process of converting data into audio files, while decoding is the process of converting audio files into text.

• Encoding is the process of compressing data to save storage space, while decoding is the process of expanding the data back to its original size.

• Encoding is the process of converting data into a specific format for transmission or storage, while decoding is the process of converting the encoded data back into its original form.

• Encoding is the process of encrypting data for security, while decoding is the process of decrypting the data to make it readable.

What is the difference between analog and digital signals?

• Analog signals are continuous and can take any value within a range, while digital signals are discrete and can only take specific values.

• Analog signals are more reliable than digital signals

• Analog signals are faster than digital signals

• Analog signals are only used for audio, while digital signals are only used for video

Discuss the importance of data compression in digital information.

• It increases storage space and slows down data transmission.

• It only works for analog information, not digital.

• It reduces storage space and allows for faster data transmission.

• It has no impact on storage space or data transmission speed.

Discuss the concept of encryption and its significance in digital information security.

• Encryption is the process of converting information into a code to prevent unauthorized access. It is significant in digital information security as it helps protect sensitive data from being accessed by unauthorized users.

• Encryption is not significant in digital information security

• Encryption is only used for protecting physical documents

• Encryption is the process of converting information into sound waves

Discuss the ethical considerations related to the use and distribution of digital information.

• Ethical considerations related to the use and distribution of digital information include food safety, transportation regulations, and environmental conservation.

• Ethical considerations related to the use and distribution of digital information include fashion trends, celebrity gossip, and sports statistics.

• Ethical considerations related to the use and distribution of digital information include ancient history, astronomy, and marine biology.

• Ethical considerations related to the use and distribution of digital information include privacy, security, intellectual property, and access to information.

Which of the following best describes how computing devices represent information?

• A computer will either represent information as bits or bytes but not both

• A computer represents data as a byte which is either a 0 or a 1.

• A computer represents data as bits which is either a 0 or a 1.

• A computer represents information as bits which contain 8 bytes.

How many numbers can be represented with an 8-bit binary system?

• 128

• 256

• 127

• 255

Which of the following best describes how computing devices represent information?

• A computer will either represent information as bits or bytes but not both

• A computer represents data as a byte which is either a 0 or a 1.

• A computer represents data as bits which is either a 0 or a 1.

• A computer represents information as bits which contain 8 bytes.

How many numbers can be represented with an 8-bit binary system?

• 128

• 256

• 127

• 255