©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED.
COMSC 260 FINAL PRACTICE Exam
Questions With Correct Answers 2025
What is the *largest UN*signed number that you can make with five (5) bits?
-----------------------------
*31*
32
16
15 - Answer✔*31*
When adding binary numbers together in a column, what two steps are performed if their sum is
greater than 1?
1. What you put down in the column is calculated by the formula: _
2. Carry a 1 over to the next column
HINT:
1 + 1 = 10
1 + 1 + 1 = 11
-----------------------------
1. sum = 2 mod sum
1. sum = 1 mod sum
1. sum = sum mod 1
1|Page
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*1. sum = sum mod 2* - Answer✔*1. sum = sum mod 2*
Suppose we have the following *UN*signed binary number: 10
And we want to *sign-extend* this binary number to four binary bits. The binary number
*MUST* have the same value, but now it will be four binary bits rather than two.
Which of the options below is correct?
-----------------------------
0110
*0010*
1010
1110 - Answer✔*0010*
Suppose we want to represent the decimal number *65* as an *UN*signed binary number using
the *least* number of bits possible. Which of the options below is correct?
-----------------------------
10000001
010000001
01000001
*1000001* - Answer✔*1000001*
Suppose n = number of hexadecimal symbols. Which of the options below is the correct formula
that will give you the largest UNsigned hexadecimal number that you can represent for a given
number of hexadecimal symbols?
-----------------------------
16^(n-1) - 1
16^(n)+ 1
16^(n+1) + 1
*16^(n) - 1* - Answer✔*16^(n) - 1*
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What is the *UN*signed hexadecimal number 80 converted to decimal?
-----------------------------
-128
-256
*128*
256 - Answer✔*128*
Which of the following options below describes the correct algorithm for converting an
*UN*signed decimal number to binary?
1. Divide the number by 2
2. Calculate and store the quotient
3. Calculate and store the remainder
4. Set number = _
5. If the _ is not equal to 0, go back to step 1, else go to step 6
6. The binary number is stored in the remainder
-----------------------------
4. remainder
5. quotient
4. quotient
5. remainder
4. remainder
5. remainder
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*4. quotient*
*5. quotient* - Answer✔*4. quotient*
*5. quotient*
Suppose n = number of bits. Which of the options below is the correct formula that will give you
the *largest UN*signed binary number that you can represent for a given number of bits?
-----------------------------
2^(n-1) - 1
2^(n) + 1
*2^(n) - 1*
2^(n+1) + 1 - Answer✔*2^(n) - 1*
How many bits are in a byte?
-----------------------------
32
*8*
16
64 - Answer✔*8*
Which of the options below is the *largest UN*signed hexadecimal number that you can make
with two (2) hexadecimal symbols
-----------------------------
8F
7F
0F
*FF* - Answer✔*FF*
Suppose we want to represent the decimal number *19* as a *SIGNED* binary number using
the least number of bits possible. Which of the options below is correct?
4|Page
COMSC 260 FINAL PRACTICE Exam
Questions With Correct Answers 2025
What is the *largest UN*signed number that you can make with five (5) bits?
-----------------------------
*31*
32
16
15 - Answer✔*31*
When adding binary numbers together in a column, what two steps are performed if their sum is
greater than 1?
1. What you put down in the column is calculated by the formula: _
2. Carry a 1 over to the next column
HINT:
1 + 1 = 10
1 + 1 + 1 = 11
-----------------------------
1. sum = 2 mod sum
1. sum = 1 mod sum
1. sum = sum mod 1
1|Page
, ©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED.
*1. sum = sum mod 2* - Answer✔*1. sum = sum mod 2*
Suppose we have the following *UN*signed binary number: 10
And we want to *sign-extend* this binary number to four binary bits. The binary number
*MUST* have the same value, but now it will be four binary bits rather than two.
Which of the options below is correct?
-----------------------------
0110
*0010*
1010
1110 - Answer✔*0010*
Suppose we want to represent the decimal number *65* as an *UN*signed binary number using
the *least* number of bits possible. Which of the options below is correct?
-----------------------------
10000001
010000001
01000001
*1000001* - Answer✔*1000001*
Suppose n = number of hexadecimal symbols. Which of the options below is the correct formula
that will give you the largest UNsigned hexadecimal number that you can represent for a given
number of hexadecimal symbols?
-----------------------------
16^(n-1) - 1
16^(n)+ 1
16^(n+1) + 1
*16^(n) - 1* - Answer✔*16^(n) - 1*
2|Page
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What is the *UN*signed hexadecimal number 80 converted to decimal?
-----------------------------
-128
-256
*128*
256 - Answer✔*128*
Which of the following options below describes the correct algorithm for converting an
*UN*signed decimal number to binary?
1. Divide the number by 2
2. Calculate and store the quotient
3. Calculate and store the remainder
4. Set number = _
5. If the _ is not equal to 0, go back to step 1, else go to step 6
6. The binary number is stored in the remainder
-----------------------------
4. remainder
5. quotient
4. quotient
5. remainder
4. remainder
5. remainder
3|Page
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*4. quotient*
*5. quotient* - Answer✔*4. quotient*
*5. quotient*
Suppose n = number of bits. Which of the options below is the correct formula that will give you
the *largest UN*signed binary number that you can represent for a given number of bits?
-----------------------------
2^(n-1) - 1
2^(n) + 1
*2^(n) - 1*
2^(n+1) + 1 - Answer✔*2^(n) - 1*
How many bits are in a byte?
-----------------------------
32
*8*
16
64 - Answer✔*8*
Which of the options below is the *largest UN*signed hexadecimal number that you can make
with two (2) hexadecimal symbols
-----------------------------
8F
7F
0F
*FF* - Answer✔*FF*
Suppose we want to represent the decimal number *19* as a *SIGNED* binary number using
the least number of bits possible. Which of the options below is correct?
4|Page
