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
Why do computers use the binary number system?
Easy 1 Mark
What are the only two states a computer circuit can be in?
A Because binary is easier for humans to understand
B Because computers can only recognise two electrical states ON and OFF
C Because binary numbers are always larger than decimal
D Because binary requires less electricity
2
Everything inside a computer is ultimately stored as:
Easy 1 Mark
What is the most basic language all computers understand?
A Decimal numbers
B Hexadecimal codes
C Binary form (0s and 1s)
D ASCII text only
3
What is a number system?
Easy 1 Mark
Think about how different systems use different sets of symbols to count.
A A method to represent numbers using a specific set of digits or symbols
B A type of computer memory
C A programming language
D A unit of data storage
4
What determines the number of digits used in a number system?
Easy 1 Mark
Base 2 uses 2 digits base 10 uses 10 — what property defines this?
A The speed of the computer
B The base or radix of the number system
C The memory size of the computer
D The operating system installed
5
Which four number systems are most important in computing?
Medium 2 Marks
Focus on the actual number systems used by computers not encoding standards.
A Decimal Roman Octal Binary
B Decimal Binary Octal Hexadecimal
C Binary Hexadecimal ASCII Unicode
D Decimal Binary Octal ASCII
6
What is the base of the decimal number system?
Easy 1 Mark
Count how many different digits decimal uses.
A Base 2
B Base 8
C Base 10
D Base 16
7
Which digits are used in the decimal number system?
Easy 1 Mark
This is the everyday counting system humans use.
A 0 and 1 only
B 0 to 7
C 0 to 9
D 0 to 15
8
In decimal number 345 what is the positional value of the digit 3?
Medium 2 Marks
Each position in decimal represents a power of 10.
A 3
B 30
C 300
D 3000
9
What is the base of the binary number system?
Easy 1 Mark
Binary means two — how many digits does it use?
A Base 2
B Base 8
C Base 10
D Base 16
10
What does binary digit 1 represent electrically?
Easy 1 Mark
Think of a light switch — 1 means the circuit is on.
A OFF state
B Neutral state
C ON state
D Unknown state
11
What is the decimal equivalent of binary 1011?
Medium 2 Marks
Multiply each bit by its corresponding power of 2 from right to left.
A 9
B 10
C 11
D 13
12
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
13
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
14
What is the base of the octal number system?
Easy 1 Mark
Octal comes from the Latin word for eight.
A Base 2
B Base 8
C Base 10
D Base 16
15
Which digits are used in the octal number system?
Easy 1 Mark
The base tells you the highest digit allowed — base 8 goes up to 7.
A 0 and 1 only
B 0 to 7
C 0 to 9
D 0 to 15
16
Why are octal numbers useful in computing?
Medium 2 Marks
Why would a shorter representation of binary be useful?
A They are easier for humans to read than decimal
B One octal digit corresponds to exactly three binary digits providing compact notation
C They are used to represent colours in web design
D They are the native language of all modern processors
17
What is the decimal equivalent of octal 17?
Medium 2 Marks
Multiply each octal digit by its corresponding power of 8.
A 13
B 14
C 15
D 17
18
What is the base of the hexadecimal number system?
Easy 1 Mark
Hex = 6 deci = 10 — add them to get the base.
A Base 2
B Base 8
C Base 10
D Base 16
19
Which symbols does hexadecimal use?
Medium 2 Marks
After digit 9 hexadecimal continues with letters.
A 0-9 only
B 0-7 and A-F
C 0-9 and A-F
D 0-9 and a-z
20
What is the decimal value of hexadecimal digit F?
Easy 1 Mark
Start from A=10 and count up to find the value of F.
A 6
B 14
C 15
D 16
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Difficulty Distribution
Easy 12
Medium 6
Hard 2