APCSP Data Representation 3

Question 1

An analog signal differs from a digital signal in that an analog signal:

Accepted Answer

varies continuously over a range of values

Answer

Analog signals vary continuously and can take on any value within a range, whereas digital signals represent data as discrete values.

Question 2

When converting an analog audio recording to digital, increasing the sampling rate primarily improves:

Accepted Answer

the accuracy of representing high-frequency sounds

Answer

A higher sampling rate captures more detail per second, allowing higher-frequency audio components to be accurately represented.

Question 3

Which of the following is an example of metadata?

Accepted Answer

The date, location, and camera settings stored alongside a JPEG image

Answer

Metadata is data about data; EXIF information like date taken and GPS coordinates describes the image without being part of the visual content itself.

Question 4

What does the term 'bit depth' refer to in the context of digital audio?

Accepted Answer

The number of bits used to represent each audio sample, affecting dynamic range

Answer

Bit depth determines how many distinct amplitude levels each sample can have; more bits means greater dynamic range and finer volume gradations.

Question 5

The binary number 11111111 equals which decimal value?

Accepted Answer

255

Answer

All 8 bits set to 1: 128+64+32+16+8+4+2+1 = 255, which equals 2^8 − 1.

(APCSP) AP Computer Science Principles Practice Test

(APCSP) AP Computer Science Principles Practice Test

APCSP Data Representation 3