AP Computer Science Principles Exam
with Verified Answers
What is the lowest base in which the number 10 could be a valid number? - ✔✔Binary
Consider the following three binary numbers:
01010
010000
1110
Which of the following lists the numbers in order from least to greatest? - ✔✔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? - ✔✔Add a bit to studentID to double the number of IDs that the
database can represent.
Consider the following three numbers
10100(base 2), 123(base 10), d7(base-16)
which of the following displays the numbers in ascending order? - ✔✔10100, 123, d7
consider the following four hexadecimal numbers
AB3D2A, FEDCB, 11A2B, A7BC26
Which of the following displays the numbers in asscending order? - ✔✔11A2B,FEDCB,
A7BC26,AB3D2A,
,How many digits are there in the binary number system? - ✔✔2
What is the 4-bit binary number for the decimal number fifteen (15)? - ✔✔1111
Which number represents the value of the base in every number system? - ✔✔10
Which of the following can be used to express the value of every number in any number
system? - ✔✔Polynomial
Graphics images are stored as two dimensinal arrays of pixels. Many use 24-bits of memory
space for each pixel. This is further divided up into three 8-bit sequence s that stores the RGB
(RED, GREEN , BLUE) value of each pixel.
if 24-bits are used for one pixel and this pixel's color is determined by the three Red, Green and
Blue value, each using 8-bits, how many different color combination exitst for a pixel? -
✔✔16,777,216
consider the following four binary numbers
11100111 , 10101010, 11110000, 11001100
which of the following displays the numbers in the decending order? - ✔✔11110000,
11100111, 11001100, 10101010
What is a group of four binary digits called? - ✔✔nibble
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 binary numbers. According to ASCII character
encoding, which of the following letters is represented by the 8-bit binary value:0100 0010 -
✔✔ASCII Character: B
, What is the best explanation for why digital data is represented in computers in binary? -
✔✔It's easier, cheaper, and more reliable to build machines and devices that only have to
distinguish between binary states.
The chart below show ASCII encoding for some charaters what binary number is used to store
char c? - ✔✔1100011
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? - ✔✔Some large numbers
cannot be represented in binary and can only be represented in decimal.
consider the following four numbers
101010(base 2), 43(base 10),101100 (base 2), 37( base 10)
which of the following displays the numbers in descending order? - ✔✔101100(base 2) 43(base
10) 101010 (base 2) 37( base 10)
if the decimal number 89 represents ASCII charater Y, what binary number is used to strore
ASCII charater Q? - ✔✔1010001
What is the minimum number of bits you would need to encode the 26 upper and low case
letters of the alphabet plus a space - a total of 53 characters? - ✔✔6 bits
Two students have developed a protocol in which they send 4-bit messages to each other. They
decide to modify their protocol to start sending 8-bit messages instead. How many more values
can be represented in an 8-bit message than a 4-bit message? - ✔✔24 = 16 times as many
values
with Verified Answers
What is the lowest base in which the number 10 could be a valid number? - ✔✔Binary
Consider the following three binary numbers:
01010
010000
1110
Which of the following lists the numbers in order from least to greatest? - ✔✔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? - ✔✔Add a bit to studentID to double the number of IDs that the
database can represent.
Consider the following three numbers
10100(base 2), 123(base 10), d7(base-16)
which of the following displays the numbers in ascending order? - ✔✔10100, 123, d7
consider the following four hexadecimal numbers
AB3D2A, FEDCB, 11A2B, A7BC26
Which of the following displays the numbers in asscending order? - ✔✔11A2B,FEDCB,
A7BC26,AB3D2A,
,How many digits are there in the binary number system? - ✔✔2
What is the 4-bit binary number for the decimal number fifteen (15)? - ✔✔1111
Which number represents the value of the base in every number system? - ✔✔10
Which of the following can be used to express the value of every number in any number
system? - ✔✔Polynomial
Graphics images are stored as two dimensinal arrays of pixels. Many use 24-bits of memory
space for each pixel. This is further divided up into three 8-bit sequence s that stores the RGB
(RED, GREEN , BLUE) value of each pixel.
if 24-bits are used for one pixel and this pixel's color is determined by the three Red, Green and
Blue value, each using 8-bits, how many different color combination exitst for a pixel? -
✔✔16,777,216
consider the following four binary numbers
11100111 , 10101010, 11110000, 11001100
which of the following displays the numbers in the decending order? - ✔✔11110000,
11100111, 11001100, 10101010
What is a group of four binary digits called? - ✔✔nibble
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 binary numbers. According to ASCII character
encoding, which of the following letters is represented by the 8-bit binary value:0100 0010 -
✔✔ASCII Character: B
, What is the best explanation for why digital data is represented in computers in binary? -
✔✔It's easier, cheaper, and more reliable to build machines and devices that only have to
distinguish between binary states.
The chart below show ASCII encoding for some charaters what binary number is used to store
char c? - ✔✔1100011
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? - ✔✔Some large numbers
cannot be represented in binary and can only be represented in decimal.
consider the following four numbers
101010(base 2), 43(base 10),101100 (base 2), 37( base 10)
which of the following displays the numbers in descending order? - ✔✔101100(base 2) 43(base
10) 101010 (base 2) 37( base 10)
if the decimal number 89 represents ASCII charater Y, what binary number is used to strore
ASCII charater Q? - ✔✔1010001
What is the minimum number of bits you would need to encode the 26 upper and low case
letters of the alphabet plus a space - a total of 53 characters? - ✔✔6 bits
Two students have developed a protocol in which they send 4-bit messages to each other. They
decide to modify their protocol to start sending 8-bit messages instead. How many more values
can be represented in an 8-bit message than a 4-bit message? - ✔✔24 = 16 times as many
values
