CSP Unit 1 Review

Front

True or False: "bit" is short for "binary digit"

Back

True

Front

True or False: 8 bits makes 1 byte. The maximum decimal (base 10) value that can be represented by one byte is 256.

Back

False

Answer explanation

It's true that 8 bits = 1 byte. It is also true that you can represent 256 total values with 1 byte.

HOWEVER - the maximum 8 bit number is 255 (decimal/base 10) since you have to include zero (0) in the values you can represent.

256 (decimal/base 10) is the first 9 bit number.

Front

True or False: A computer represents data as bytes, which can either represent a 0 or a 1.

Back

False

Answer explanation

A computer represents data as BITS, which can be either a zero or a one.

A byte is 8 bits.

Front

Which of these is the best definition of abstraction? Options: Abstraction allows us to represent complex information or perform complex tasks by showing underlying complexity., Abstraction allows us to represent complex information or perform complex tasks by hiding underlying complexity., Programming in machine language (binary) instead of a programming language like Python., None of these are a good definition.

Back

Abstraction allows us to represent complex information or perform complex tasks by hiding underlying complexity.

Front

Which of these best describes storing analog information digitally? Options: Downloading a song from the internet and texting it to a friend., Using sampling to store an image in an analog format., Recording a video of a parade with your phone., None of these.

Back

Recording a video of a parade with your phone.

Answer explanation

The downloaded song from the internet is already digital.

Sampling does not result in an analog artifact.

Front

A computer uses 3 bits to represent decimal (base 10) numbers. Which of these decimal values would result in an overflow error? Options: 3, 4, 7, 8

Back

8

Answer explanation

The maximum three bit number is 111 (binary) = 7 (decimal).

8 would cause an overflow because you need 4 bits to represent 8 (1000 (binary) = 8 (decimal))

Front

Which of these is the best explanation for round-off errors?

Back

A fixed number of bits can only represent a limited amount of precision.

Front

Convert the binary (base-2) number 10101 to decimal (base-10)

Back

8

Answer explanation

10101 =

1*(2^4) + 0*(2^3) + 1*(2^2) + 0*(2^1) + 1*(2^0) =

1*16 + 0*8 + 1*4 + 0*2 + 1*1 =

16 + 0 + 4 + 0 + 1 =

21

Front

True or False: Even binary numbers will always end in 1, while odd binary numbers will always end in 0.

Back

False

Front

Convert the decimal (base 10) number 42 to binary (base-2)

Back

101010

Answer explanation

Using your flippy do, the first place value that fits in to 42 going from left to right is 32, so that place becomes a 1.

42 - 32 is 10, the next place value, 16, is too big, so that becomes a 0.

8 fits, so that place value becomes a 1. Now you have 10-8 = 2 left. 4 is too big, so that place becomes a 0. 2 fits in to 2, so that place value becomes a 1. You have nothing left, so the ones place is a zero.

Stitch it all together = 101010