CSF Midterm Prep

If a binary number ends with a 1, it must be...

• An odd number
• An even number
• A prime number
• The number 12

Tags

CCSS.2.OA.C.3

Binary is:

• a system using the digits 0 and 1 to represent a letter, digit, or other character in a computer or other electronic device.
• the most common format for text files in computers and on the Internet

ASCII is:

• a numerical system that has 2 rather than 10 as a base.
• the most common format for text files in computers and on the Internet

What is binary also known as?

• Base 1

• Base 2

• Base 3

• Base 10

The most fundamental unit of computer data storage is:

• a byte
• a megabyte
• a bit
• a gigabyte

What is the best explanation for why digital data is represented in computers in binary?

• The binary number system is the only system flexible enough to allow for representing data other than numbers.

• It's easier, cheaper, and more reliable to build machines and devices that only have to distinguish between binary states.

• It typically takes fewer digits to represent a number in binary when compared to other number systems (for example, the decimal number system)

• It's impossible to build a computing machine that uses anything but binary to represent numbers

Number systems with different bases such as binary (base-2) and decimal (base-10) are all used to view and represent digital data.

Which of the following is NOT true about representing digital data?

• At one of the lowest levels of abstraction, all digital data can be represented in binary using only combinations of the digits zero and one.

• The same value (number) can have a different representation depending on the number system used to represent it.

• Groups of bits can be used to represent abstractions, including but not limited to numbers and characters.

• Some large numbers cannot be represented in binary and can only be represented in decimal.

A corporate office will be doubling the total number of employees. The company keeps a database in which each employees's unique ID number is stored as an 8 bit number called employeeID. Every 8 bit number has already been assigned. Of the options provided below, which is the smallest change to the way employeeID is represented necessary to ensure each incoming employee receives a unique ID?

• Add a bit to employeeID to double the number of IDs that the database can represent.

• Double the number of bits in employeeID to double the number of IDs that the database can represent

• Keep using an 8-bit number foremployeeID but reserve the first bit to indicate department

• Remove a bit from employeeID to make room for incoming employees

8 bits is enough to represent 256 different numbers. How many total bits do you need to represent 512 (twice as many) numbers?

• 16 bits

• 10 bits

• 9 bits

• 17 bits

This is a character-encoding scheme that uses a numeric value to represent each character. Characters can also be represented by binary numbers.

• Ask Key

• ASCII

• Hexidecimal

• ASC Encoding