APCSP Practice Test (1) ACTUAL UPDATED QUESTIONS AND CORRECT
ANSWERS
What is the best explanation for digital data is D. It's easier, cheaper, and more reliable to build machines and devices that only
represented in computers in binary? have to distinguish between binary states.
A. The binary number system is the only number system
flexible enough to allow for representing data other than
numbers.
B. As a consequence of history: early pioneers of
computing were making secret codes in binary, and this
simply evolved into modern computing.
C. It's impossible to build a computer machine that uses
anything but binary to represent numbers.
D. 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 number for the decimal number ten (10)? B. 1010
A. 0010
B. 1010
C. 0110
D. 0101
,What is the minimum number of bits you would need to C. 5 bits
encode the 26 letters of the alphabet plus a space - a
total of 27 characters?
A. 2 bits
B. 3 bits
C. 5 bits
D. 6 bits
The next questions refers to the hexidecimal (base 16) D. There is a limit to the number of things that can be represented in binary data at
number system: which point switching to hexadecimal representation is necessary.
Number bases, including binary, decimal, and
hexadecimal, are used to view and represent digital data.
Which of the following is NOT true about representing
digital data?
A. 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.
B. Hexadecimal is used to represent digital data because
hexadecimal representation uses only 1 digit to represent
groups of 4 binary digits.
C. Binary can be used to represent more complex, higher
level abstractions, including but not limited to numbers,
characters, and colors.
D. There is a limit to the number of things that can be
represented in binary data at which point switching to
hexadecimal representation is necessary.
Consider the following numbers given in Binary (BIN), B. DEC: 13, BIN: 1110, HEX: F
Decimal (DEC), and Hexadecimal (HEX) representations:
BIN: 1110
DEC: 13
HEX: F
Which of the following lists the numbers in order from
least to greatest?
A. BIN: 1110, DEC: 13, HEX: F
B. DEC: 13, BIN: 1110, HEX: F
C. DEC: 13, HEX: F, BIN: 1110
D. HEX: F, DEC: 13, BIN: 1110
, A middle school is expanding to open a high school next A. Add a bit to studentID to double the number of IDs that the database can
year, doubling the total number of students. The school represent.
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. Which is
the most accurate description of how the school could
modify the way studentID is represented in the database
to ensure each incoming student receives a unique ID?
A. Add a bit to studentID to double the number of IDs
that the database can represent.
B. Double the number of bits in studentID to double the
number of IDs that the databases can represent.
C. Keep using an 8-bit number for studentID but reserve
the first bit to indicate middle school or high school.
D. Remove a bit from studentID to make room for
incoming students.
A user clicks on a website, and it begins to load D. Low bandwidth, low latency
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?
A. High bandwidth, high latency
B. Low bandwidth, high latency
C. High bandwidth, low latency
D. Low bandwidth, low latency
8 bits is enough to represent 256 different numbers. How A. 9 bits
many total bits do you need to represent 512 (twice as
many) numbers?
A. 9 bits
B. 10 bits
C. 16 bits
D. 17 bits
ANSWERS
What is the best explanation for digital data is D. It's easier, cheaper, and more reliable to build machines and devices that only
represented in computers in binary? have to distinguish between binary states.
A. The binary number system is the only number system
flexible enough to allow for representing data other than
numbers.
B. As a consequence of history: early pioneers of
computing were making secret codes in binary, and this
simply evolved into modern computing.
C. It's impossible to build a computer machine that uses
anything but binary to represent numbers.
D. 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 number for the decimal number ten (10)? B. 1010
A. 0010
B. 1010
C. 0110
D. 0101
,What is the minimum number of bits you would need to C. 5 bits
encode the 26 letters of the alphabet plus a space - a
total of 27 characters?
A. 2 bits
B. 3 bits
C. 5 bits
D. 6 bits
The next questions refers to the hexidecimal (base 16) D. There is a limit to the number of things that can be represented in binary data at
number system: which point switching to hexadecimal representation is necessary.
Number bases, including binary, decimal, and
hexadecimal, are used to view and represent digital data.
Which of the following is NOT true about representing
digital data?
A. 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.
B. Hexadecimal is used to represent digital data because
hexadecimal representation uses only 1 digit to represent
groups of 4 binary digits.
C. Binary can be used to represent more complex, higher
level abstractions, including but not limited to numbers,
characters, and colors.
D. There is a limit to the number of things that can be
represented in binary data at which point switching to
hexadecimal representation is necessary.
Consider the following numbers given in Binary (BIN), B. DEC: 13, BIN: 1110, HEX: F
Decimal (DEC), and Hexadecimal (HEX) representations:
BIN: 1110
DEC: 13
HEX: F
Which of the following lists the numbers in order from
least to greatest?
A. BIN: 1110, DEC: 13, HEX: F
B. DEC: 13, BIN: 1110, HEX: F
C. DEC: 13, HEX: F, BIN: 1110
D. HEX: F, DEC: 13, BIN: 1110
, A middle school is expanding to open a high school next A. Add a bit to studentID to double the number of IDs that the database can
year, doubling the total number of students. The school represent.
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. Which is
the most accurate description of how the school could
modify the way studentID is represented in the database
to ensure each incoming student receives a unique ID?
A. Add a bit to studentID to double the number of IDs
that the database can represent.
B. Double the number of bits in studentID to double the
number of IDs that the databases can represent.
C. Keep using an 8-bit number for studentID but reserve
the first bit to indicate middle school or high school.
D. Remove a bit from studentID to make room for
incoming students.
A user clicks on a website, and it begins to load D. Low bandwidth, low latency
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?
A. High bandwidth, high latency
B. Low bandwidth, high latency
C. High bandwidth, low latency
D. Low bandwidth, low latency
8 bits is enough to represent 256 different numbers. How A. 9 bits
many total bits do you need to represent 512 (twice as
many) numbers?
A. 9 bits
B. 10 bits
C. 16 bits
D. 17 bits
