AP Computer Science Principals Final
NEWEST EXAM VERSION QUESTIONS
WITH GOLDEN TIPS SOLUTIONS 100%
CORRECT
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?
- <<ANSWER>>Adding one extra bit to the student IDs will allow
the school to double the amount of unique ID codes.
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 latency and low bandwidth
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.ASCII characters can also be represented by
hexadecimal numbers. According to ASCII character encoding,
which of the following letters is represented by the hexadecimal
(base 16) number 56? - <<ANSWER>>V: Because the first place
value represents the decimal number being added while the
second place represents the multiples of 16 and so on.
A video-streaming Website uses 32-bit integers to count the
number of times each video has been played. In anticipation of
some videos being played more times than can be represented
with 32 bits, the Web site is planning to change to 64-bit integers
for the counter. Which of the following best describes the result of
using 64-bit integers instead of 32-bit integers? -
<<ANSWER>>232 times as many values can be represented.
Basically it's 264-232which is 232.
A binary message consisting of four bits was sent to you by a
friend. The message was supposed to be ABAB. Unfortunately,
your friend set the bit on the wire once every 2 seconds, but you
read the wire once every second. Assuming that the first bit was
sent and read at the same time, what message did you receive
instead? - <<ANSWER>>AABB
When sending a response to a question with four possible
answers, the most efficient method will require no more than what
number of bits? - <<ANSWER>>2 bits
You have a coordinate grid that is 96 x 96. Assuming that you
encode the x and y coordinate as separate numbers, what is the
minimum number of bits that you will need to encode a coordinate
in that space? - <<ANSWER>>14 bits
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