Hiding the complexity with something simpler

Making a photo smaller but more pixelated

When visiting a museum Sue takes a photo of a painting with a smartphone which stores the photo as an image file. Which of the following best describes the differences between the painting itself and the photo of the painting stored on the smartphone?

The photo is a digital representation of the analog painting

Both the painting and the photo are analog

Sampling can be used to determine whether the analog image is an accurate representation of the painting

The phone can represent the photo in either digital or analog formats depending on the sampling technique that is used

Lisa takes a picture with her smartphone which she subsequently posts online. Allen finds the picture online and posts a copy of it on his website with an attached Creative Commons license. Which of the following best describes who owns the photo?

Lisa owns the photo because she was the original creator and did not license the work.

Allen owns the photo because only holders of a Creative Commons license can own works online.

Lisa owns the photo because it was granted a Creative Commons license by another person online.

Both own the photo because creating a copy makes it her intellectual property.

Ryan is designing an app that needs to quickly send low quality photos between users. Most smartphones take much higher quality photos than Ryan needs for his app. Which answer best describes the type of compression Ryan should choose and why?

Lossy compression since it typically results in smaller data sizes.

Lossless compression since it ensures perfect reconstruction of the photo.

Lossy compression since it ensures perfect reconstruction of the photo.

Lossless compression since it typically results in smaller data sizes.

Which of the following is true of lossy and lossless compression algorithms?

Lossy compression algorithms are typically better than lossless compression algorithms at reducing the number of bits needed to represent a piece of data.

Lossy compression algorithms are used when perfect reconstruction of the original data is important.

Lossless compression algorithms are only used to compress text data.

Lossless compression algorithms only allow for an approximate reconstruction of the original data.

Which of the following is true of how computers represent numbers?

With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors.

Using a fixed but large number of bits can eliminate the possibility of round off error when representing numbers in binary

Using a fixed but large number of bits, for example 128, eliminates the possibility of overflow errors.

With a large but fixed number of bits it is possible to eliminate either round-off errors or overflow errors, but not both.

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

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

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 information as bits which contain 8 bytes.

AP CSP Unit 1 Review (code.org)

Authored by Arlen Nagata

Computers

10th - 12th Grade

Used 416+ times

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19 questions

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MULTIPLE CHOICE QUESTION

30 sec • 5 pts

A Binary number has a base of _____?

MULTIPLE CHOICE QUESTION

2 mins • 5 pts

Convert from Binary to Decimal: 000101

MULTIPLE CHOICE QUESTION

2 mins • 5 pts

Convert from Decimal to Binary: 13

1101

1011

1001

1110

101001

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What is the smallest unit of information in a computer?

Nano

Hertz

Bit

Byte

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What is the Binary error that occurs when a number is too large?

Numbers are never too large

Counting Error

NaN Error

Overflow Error

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What is the Binary error that occurs when a number is too Precise?

Decimal Error

Round-Off Error

Counting Error

Precision Error

MULTIPLE CHOICE QUESTION

2 mins • 5 pts

Using the Image, what character is represented by the number 68?

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AP CSP Unit 1 Review (code.org)

A Binary number has a base of _____?

Convert from Binary to Decimal: 000101

Convert from Decimal to Binary: 13

What is the smallest unit of information in a computer?

What is the Binary error that occurs when a number is too large?

What is the Binary error that occurs when a number is too Precise?

Using the Image, what character is represented by the number 68?

What is abstraction?

You are trying to represent a photo with a digital image, but the image is not clear. What should you do?

Which form of comression would you use to save data when you transmit text messages and you don't want to lose information?

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