AP CSP Final Exam QUESTIONS &
ANSWERS
What is the best explanation for why digital data is represented in computers in binary?
- ANSWER It's easier, cheaper, and more reliable to build machines and devices that
only have to distinguish between binary states.
What is the 4-bit binary number for the decimal number Ten (10)? - ANSWER 1010
What is the minimum number of bits you would need to encode the 26 letters of the
alphabet plus a space - a total of 27 characters? - ANSWER 5 bits
Number systems with different bases such as binary (base-2), octal (base-8), decimal
(base-10), and hexadecimal (base-16), are all used to view and represent digital data.
Which of the following is NOT true about representing digital data? - ANSWER When
data is large enough computers switch to using decimal representation instead of
binary, because you can represent larger numbers with fewer digits.
Consider the following three binary numbers:
01010
010000
1110
Which of the following lists the numbers in order from least to greatest? - ANSWER
01010
1110
010000
A middle school is expanding to open a high school next year, doubling the total number
of students. The school keeps a database in which each student's unique ID number is
stored as an 8 bit number called studentID. Before the arrival of the new students
almost every 8 bit number has already been assigned to a student. Of the options
provided below, which is the smallest change to the way studentID is represented
necessary to ensure each incoming student receives a unique ID? - ANSWER Add a bit
to studentID to double the number of IDs that the database can represent.
A user clicks on a website, and it begins to load immediately, but it takes a long time to
load completely and pictures appear slowly, one by one. Which of the following is
demonstrated through this situation? - ANSWER Low bandwidth, low latency
, 8 bits is enough to represent 256 different numbers. How many total bits do you need to
represent 512 (twice as many) numbers? - ANSWER 9 bits
ASCII is a character-encoding scheme that uses a numeric value to represent each
character. For example, the uppercase letter "G" is represented by the decimal (base
10) value 71. A partial list of characters and their corresponding ASCII values are
shown in the table below. (See Code.Org Unit 1 Ch 1 Assessment Question 9)
ASCII characters can also be represented by binary numbers. According to ASCII
character encoding, which of the following letters is represented by the 8-bit binary
value: 0100 0010 - ANSWER ASCII Character: B
Which of the following BEST describes how protocols on the Internet (e.g. IP, TCP,
HTTP) make use of abstraction to accomplish their respective purposes? - ANSWER
Low level protocols can provide functionality to high level protocols without revealing the
details of how this is accomplished.
According to the domain name system (DNS), which of the following is a subdomain of
the domain example.com? - ANSWER about.example.com
Which of the following is NOT true about TCP/IP packets? - ANSWER TCP guarantees
that no packets are ever dropped
The Internet Engineering Task Force (IETF) defines the protocols and standards for
how the Internet works. The members of the IETF are: - ANSWER A loosely organized
collection of citizens and engineers.
How does a computer resolve a domain name into an IP address? - ANSWER It asks a
DNS server for the corresponding IP address
The figure (See Code.org Unit 1 Lesson 2 Assessment Question 9) represents a
network of physically linked computers labeled A through F. A line between two
computers indicates that the computers can communicate directly with each other. Any
information sent between two computers that are not directly connected must go
through at least one other computer. The weight or cost of sending information from one
computer to another is indicated by the number above the line.
For example, information can be sent directly between computers A, and B and will cost
5. Information sent between computers A and D must go through either computer C
(with total cost 5), or through computer B (with total cost 8)
Computer A sends a packet intended to reach computer F. Along its path it arrives at
Computer C. Which computer should Computer C forward the packet to in order to use
the most cost effective path? - ANSWER Computer D
ANSWERS
What is the best explanation for why digital data is represented in computers in binary?
- ANSWER It's easier, cheaper, and more reliable to build machines and devices that
only have to distinguish between binary states.
What is the 4-bit binary number for the decimal number Ten (10)? - ANSWER 1010
What is the minimum number of bits you would need to encode the 26 letters of the
alphabet plus a space - a total of 27 characters? - ANSWER 5 bits
Number systems with different bases such as binary (base-2), octal (base-8), decimal
(base-10), and hexadecimal (base-16), are all used to view and represent digital data.
Which of the following is NOT true about representing digital data? - ANSWER When
data is large enough computers switch to using decimal representation instead of
binary, because you can represent larger numbers with fewer digits.
Consider the following three binary numbers:
01010
010000
1110
Which of the following lists the numbers in order from least to greatest? - ANSWER
01010
1110
010000
A middle school is expanding to open a high school next year, doubling the total number
of students. The school keeps a database in which each student's unique ID number is
stored as an 8 bit number called studentID. Before the arrival of the new students
almost every 8 bit number has already been assigned to a student. Of the options
provided below, which is the smallest change to the way studentID is represented
necessary to ensure each incoming student receives a unique ID? - ANSWER Add a bit
to studentID to double the number of IDs that the database can represent.
A user clicks on a website, and it begins to load immediately, but it takes a long time to
load completely and pictures appear slowly, one by one. Which of the following is
demonstrated through this situation? - ANSWER Low bandwidth, low latency
, 8 bits is enough to represent 256 different numbers. How many total bits do you need to
represent 512 (twice as many) numbers? - ANSWER 9 bits
ASCII is a character-encoding scheme that uses a numeric value to represent each
character. For example, the uppercase letter "G" is represented by the decimal (base
10) value 71. A partial list of characters and their corresponding ASCII values are
shown in the table below. (See Code.Org Unit 1 Ch 1 Assessment Question 9)
ASCII characters can also be represented by binary numbers. According to ASCII
character encoding, which of the following letters is represented by the 8-bit binary
value: 0100 0010 - ANSWER ASCII Character: B
Which of the following BEST describes how protocols on the Internet (e.g. IP, TCP,
HTTP) make use of abstraction to accomplish their respective purposes? - ANSWER
Low level protocols can provide functionality to high level protocols without revealing the
details of how this is accomplished.
According to the domain name system (DNS), which of the following is a subdomain of
the domain example.com? - ANSWER about.example.com
Which of the following is NOT true about TCP/IP packets? - ANSWER TCP guarantees
that no packets are ever dropped
The Internet Engineering Task Force (IETF) defines the protocols and standards for
how the Internet works. The members of the IETF are: - ANSWER A loosely organized
collection of citizens and engineers.
How does a computer resolve a domain name into an IP address? - ANSWER It asks a
DNS server for the corresponding IP address
The figure (See Code.org Unit 1 Lesson 2 Assessment Question 9) represents a
network of physically linked computers labeled A through F. A line between two
computers indicates that the computers can communicate directly with each other. Any
information sent between two computers that are not directly connected must go
through at least one other computer. The weight or cost of sending information from one
computer to another is indicated by the number above the line.
For example, information can be sent directly between computers A, and B and will cost
5. Information sent between computers A and D must go through either computer C
(with total cost 5), or through computer B (with total cost 8)
Computer A sends a packet intended to reach computer F. Along its path it arrives at
Computer C. Which computer should Computer C forward the packet to in order to use
the most cost effective path? - ANSWER Computer D
