Computer Studies

Includes fundamentals of computers, hardware and software, operating systems, MS Office, internet, networking, and basic IT concepts for recruitment exams.

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1
What is the decimal value of binary 1101?
Hard 3 Marks
Work through each bit position using powers of 2 starting from the rightmost bit.
A 11
B 12
C 13
D 14
2
What is the decimal value of binary 1111?
Hard 3 Marks
All four bits are 1 — add up all four powers of 2.
A 13
B 14
C 15
D 16
3
What is the decimal equivalent of hexadecimal 2A?
Hard 3 Marks
Remember A=10 then multiply each digit by its power of 16.
A 22
B 32
C 40
D 42
4
What is 1010 - 0011 in binary?
Hard 3 Marks
Convert to decimal: 10-3=7 then convert 7 back to binary to verify.
A 0110
B 0111
C 1000
D 1001
5
What is 110 ÷ 10 in binary?
Hard 3 Marks
Convert to decimal divide then convert back to binary to verify.
A 10
B 11
C 100
D 111
6
Which correctly compares ASCII and Unicode?
Hard 3 Marks
Compare the bit size and language coverage of each standard.
A ASCII supports more characters than Unicode
B ASCII uses 7 bits and 128 characters; Unicode supports thousands of characters from all languages
C Unicode only works on Windows
D Both use exactly 7 bits per character
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