APCSP PRACTICE TEST QUESTIONS
AND DETAILED ANSWERS LATEST
UPDATE ALREADY GRADED A+
What is the best explanation for digital data is represented in computers
in binary?
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. - ANSWER- 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)?
A. 0010
,B. 1010
C. 0110
D. 0101 - ANSWER- B. 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?
A. 2 bits
B. 3 bits
C. 5 bits
D. 6 bits - ANSWER- C. 5 bits
The next questions refers to the hexidecimal (base 16) number system:
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. - ANSWER- 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), 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 - ANSWER- B. DEC: 13, BIN: 1110,
HEX: F
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. 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. -
ANSWER- A. Add a bit to studentID to double the number of IDs that
the database can represent.
NOTE:
Doubling the number of bits would obviously make room for more
student IDs, but it's inaccurate to say that that doubles the number of
possible IDs. If the number of bits went from 8 to 16, it's 256 TIMES
AS MANY possible ids. 8 bits = 256 values and 16 bits = 65,536 IDs.
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?
A. High bandwidth, high latency
B. Low bandwidth, high latency
C. High bandwidth, low latency
AND DETAILED ANSWERS LATEST
UPDATE ALREADY GRADED A+
What is the best explanation for digital data is represented in computers
in binary?
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. - ANSWER- 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)?
A. 0010
,B. 1010
C. 0110
D. 0101 - ANSWER- B. 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?
A. 2 bits
B. 3 bits
C. 5 bits
D. 6 bits - ANSWER- C. 5 bits
The next questions refers to the hexidecimal (base 16) number system:
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. - ANSWER- 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), 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 - ANSWER- B. DEC: 13, BIN: 1110,
HEX: F
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. 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. -
ANSWER- A. Add a bit to studentID to double the number of IDs that
the database can represent.
NOTE:
Doubling the number of bits would obviously make room for more
student IDs, but it's inaccurate to say that that doubles the number of
possible IDs. If the number of bits went from 8 to 16, it's 256 TIMES
AS MANY possible ids. 8 bits = 256 values and 16 bits = 65,536 IDs.
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?
A. High bandwidth, high latency
B. Low bandwidth, high latency
C. High bandwidth, low latency
