Review Digital Information Quiz

Which number system is used to store information digitally in a computer?

• Decimal (base 10)

• Binary (base 2)

• Octal (base 8)

• Hexadecimal (base 16)

How many different digits are used in the Hexadecimal number system?

• 2

• 10

• 8

• 16

What is the decimal value of 1101₂?

• 13₁₀

• 12₁₀

• 110₁₀

• 1101₁₀

How many different values can be represented using 4 bits?

• 4 different values

• 8 different values

• 16 different values

• 32 different values

Suppose the ESPN website uses 8-bit unsigned integers to store how many points a team has scored in an NBA game. For example: 0000 0010 represents 2 points 0000 1000 represents 8 points What is the highest possible score the ESPN website could display?

• 256₁₀

• 255₁₀

• 11111111₁₀

• 128₁₀

A news website uses 32-bit integers to count the number of times an article has been viewed. The website is becoming more popular, and expects some of the articles to exceed the number of views that can be represented with 32 bits. In anticipation of this, the website is planning to change to 64-bit integers for the view counter. Which of the following best describes the result of using 64-bit integers instead of 32-bit integers?

• 2 times as many values can be represented

• 32 times as many values can be represented

• 2³² times as many values can be represented

• 3²² times as many values can be represented

ASCII is a character encoding scheme that uses a numeric value to represent each character. A subset of characters (in the “Char” column) and their corresponding ASCII values are shown in the table below: According to the ASCII character encoding, which of the following characters is represented by the hexadecimal (base 16) number 6E₁₆?

• n

• N

• k

• E

Refer to the ASCII table. Which ASCII character is represented by the decimal (base 10) number 120?

• a

• c

• 78

• x

Which of the following pixels has a color value of #00ff00 (expressed in hexadecimal)?

• White Pixel

• Blue Pixel

• Red Pixel

• Green Pixel

If black is 0 and white is 1, which of the following binary codes creates the smiley face pixel image below?

• 1. 00100100 00000000 01000010

  2. 00111100 00000000

• 1. 11011011

  2. 11111111

  3. 10111101

  4. 11000011

  5. 11111111

• 1. 00110000

  2. 01010000

  3. 00111000

  4. 11111111

  5. 00000000

• 1. 01010101

  2. 10101010

  3. 01010101

  4. 10101010

  5. 01010101