APCSP DAT-1.A Data as Bits

Select all of the following data which can represented by binary sequences.

• Audio recordings

• Colors

• A string of characters

• Movies

• Numbers

Select all of the following which can represented by a single binary digit.

• The value of a Boolean variable

• The temperature setting of a thermostat

• The volume of a car radio

• The direction of travel for an elevator

• The remainder when dividing a whole number by 2

An analog audio signal on a computer is measured ...

• as input parameters to a program or procedure

• at regular intervals stored as samples represented as a sequence of bits

• as a sequence of operations that describe how the sound can be reproduced

• as text that described the attributes of the sound

Why is digital data considered an approximation of analog data?

• Digital data can perfectly store all real-world data.

• Analog data changes smoothly, while digital data is stored in discrete steps.

• Digital data is more accurate than analog data.

• Analog data cannot be converted into digital form.

Which process is used to convert analog data into a digital format?

• Encryption

• Sampling

• Compression

• Compilation

How does increasing the sampling rate affect the digital representation of an analog signal?

• It decreases the accuracy of the representation.

• It increases the accuracy and reduces the loss of detail.

• It makes the digital data take up less storage space.

• It has no effect on the quality of the digital representation.

Why can two different files with the same binary sequence display different types of data?

• Different software programs interpret the binary data differently.

• All data is stored in text format.

• Binary data cannot be interpreted in multiple ways.

• Computers automatically know the type of data based on its content.

What is the main trade-off when converting analog data to digital data?

• Digital data is always less accurate but more easily stored and processed.

• Digital data is always more accurate than analog data.

• Analog data cannot be stored or transmitted digitally.

• Digital data is an exact replica of the analog data.

Which of the following best describes why digital sampling is necessary?

• Computers cannot process continuous data, so they must approximate it in discrete steps.

• Digital sampling eliminates the need for storage.

• Digital sampling removes unnecessary details from the data.

• Analog data does not contain any useful information for computers.

How do computing devices represent all types of data at the lowest level?

• As decimal numbers

• As electrical signals interpreted as bits (0s and 1s)

• As characters and symbols only

• As hexadecimal values