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COMSC 260 FINAL PRACTICE Exam Questions With Correct Answers 2025

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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 ©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED. 2 | P a g e *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? ----------------------------- 0 *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* ©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED. 3 | P a g e 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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Institution
Comsc 260
Course
Comsc 260

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©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

, ©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

, ©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED.

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

, ©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED.

*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?



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