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WorksheetsIGCSE Computer Science CH1~CH3
Total questions: 60
Worksheet time: 45mins
Name
Class
Date
1.
Which CPU component manages instruction sequencing and timing?
a)
Multiple Choice
b)
ALU
c)
Cache
d)
Accumulator
2.
Why does adding more cache improve CPU performance?
a)
It reduces average memory access time
b)
It increases clock speed
c)
It expands the address bus
d)
It reduces instruction size
3.
Which bus carries signals that control CPU operations?
a)
Control bus
b)
Data bus
c)
Address bus
d)
I/O bus
4.
Which best describes von Neumann architecture?
a)
Instructions and data share the same memory
b)
Separate memory for data and instructions
c)
Multiple cores required
d)
Uses only RISC CPUs
5.
Which register typically stores the next instruction address?
a)
Program counter
b)
Accumulator
c)
Index register
d)
Status register
6.
What occurs first in the fetch-decode-execute cycle?
a)
Instruction fetched from memory
b)
Instruction decoded
c)
ALU performs operation
d)
Result written to register
7.
Which CPU feature allows executing MORE than one instruction per cycle?
a)
Pipelining
b)
Cache
c)
Clock
d)
Addressing
8.
Which storage type is BEST for long-term archival?
a)
Optical storage
b)
RAM
c)
Cache
d)
Registers
9.
Which input device analyses reflected laser light patterns?
a)
Barcode scanner
b)
Keyboard
c)
Microphone
d)
Actuator
10.
Which device converts digital signals into physical movement?
a)
Actuator
b)
Sensor
c)
Projector
d)
Plotter
11.
Which memory is non-volatile?
a)
ROM
b)
RAM
c)
Cache
d)
Register file
12.
Which describes SSD storage?
a)
Uses non‑volatile flash memory
b)
Uses spinning platters
c)
Stores data with lasers
d)
Uses magnetic tape
13.
Which network hardware assigns unique identifiers to devices?
a)
NIC
b)
Router
c)
Switch
d)
Hub
14.
Which address is burned into a NIC at manufacture?
a)
MAC address
b)
IP address
c)
Subnet mask
d)
Gateway address
15.
Which printer uses powdered toner?
a)
Laser printer
b)
Inkjet printer
c)
Plotter
d)
Dot-matrix printer
16.
Which display emits light directly from LEDs?
a)
LED display
b)
LCD
c)
Plasma
d)
CRT
17.
Which system is designed for a specific function within a larger device?
a)
Embedded system
b)
Server system
c)
Node controller
d)
Virtual host
18.
Why is virtual memory used?
a)
Allows execution of larger programs than RAM alone
b)
Increases CPU frequency
c)
Stores BIOS permanently
d)
Improves cache hit rate
19.
Which bus determines the memory location to access?
a)
Address bus
b)
Data bus
c)
Control bus
d)
Pipeline bus
20.
Which component improves network traffic management by forwarding packets?
a)
Router
b)
Modem
c)
Repeater
d)
Transceiver
21.
Why does packet switching improve network efficiency?
a)
Packets take independent routes to avoid congestion
b)
All packets follow the same path
c)
Packets wait for each other
d)
Each device broadcasts globally
22.
Which part of a packet ensures data arrives in correct order?
a)
Sequence number
b)
Checksum
c)
Payload
d)
Header flag
23.
Which transmission method is MOST prone to timing skew?
a)
Parallel
b)
Serial
c)
Duplex
d)
Simplex
24.
What does the trailer of a packet normally contain?
a)
Error-checking data
b)
Destination address
c)
Routing information
d)
Packet sequence number
25.
Which communication mode allows simultaneous two-way data flow?
a)
Full-duplex
b)
Simplex
c)
Parallel
d)
Half-duplex
26.
Which USB feature allows devices to identify themselves?
a)
Device enumeration
b)
Handshake mode
c)
Auto-sync
d)
Port validation
27.
Which error-checking method fails if an even number of bits are flipped?
a)
Parity check
b)
Checksum
c)
Echo check
d)
Residue test
28.
Which method verifies data by returning it to the sender?
a)
Echo check
b)
Parity
c)
Checksum
d)
Check digit
29.
Which condition triggers ARQ?
a)
Error detected in transmission
b)
File too large
c)
Router overloaded
d)
Network latency too high
30.
Which best describes symmetric encryption?
a)
Same key used for encryption and decryption
b)
Two keys used
c)
Public key only
d)
Hash only
31.
Which key must remain secret in asymmetric encryption?
a)
Private key
b)
Public key
c)
Session key
d)
Checksum key
32.
Packet delay variation due to network congestion is known as:
a)
Jitter
b)
Latency
c)
Bandwidth
d)
Echo
33.
Why are check digits used?
a)
Detect manual data-entry errors
b)
Correct transmission errors
c)
Encrypt numeric codes
d)
Compress input data
34.
Which describes packet switching?
a)
Packets travel independently across the network
b)
Packets follow one fixed route
c)
Packets arrive in fixed size always
d)
Packets must stay in order
35.
Which transmission method is most suitable for long distances?
a)
Serial
b)
Parallel
c)
Full-duplex
d)
Simplex
36.
What ensures packet integrity after reassembly?
a)
Checksum validation
b)
Header flags
c)
Footprint ID
d)
Transmission mode
37.
In asymmetric encryption, which key encrypts data for confidentiality?
a)
Receiver’s public key
b)
Sender’s private key
c)
Receiver’s private key
d)
Session hash
38.
Which device determines optimal routing paths?
a)
Router
b)
Switch
c)
Repeater
d)
Hub
39.
Which describes half‑duplex communication?
a)
Data flows both ways but not simultaneously
b)
Only one-way communication
c)
Simultaneous both ways
d)
Bitwise-controlled mode
40.
Why is encryption essential in data transmission?
a)
Prevents unauthorized access to data
b)
Speeds up the network
c)
Reduces file size
d)
Reduces bandwidth consumption
41.
Convert the two’s complement binary number 11110110₂ to denary.
a)
−10
b)
−9
c)
−8
d)
−6
42.
Which binary addition below results in an overflow for 8-bit numbers?
a)
11101010 + 10110111
b)
00010101 + 00000111
c)
01011011 + 00001010
d)
00111101 + 00011100
43.
What is the hexadecimal equivalent of the binary number 110110111010₂?
a)
DBA
b)
D7A
c)
CBA
d)
FBA
44.
A logical right shift of 11001010₂ by 2 bits results in:
a)
110010.0
b)
1110010.0
c)
10011010.0
d)
11001.0
45.
Which character set can represent the largest range of characters?
a)
Unicode
b)
ASCII
c)
Extended ASCII
d)
Roman-8
46.
Increasing colour depth from 8-bit to 24-bit increases possible colours by a factor of:
a)
65536.0
b)
256.0
c)
1024.0
d)
8192.0
47.
Which factor MOST affects the file size of uncompressed audio?
a)
Sample rate × sample resolution × length
b)
Number of channels only
c)
Codec used
d)
Speaker output power
48.
What is the denary value of the hexadecimal number 3F7?
a)
1015.0
b)
999.0
c)
1012.0
d)
1023.0
49.
Which binary representation is valid in two’s complement for −1?
a)
11111111.0
b)
10000000.0
c)
11111110.0
d)
1.0
50.
Which factor affects BOTH image clarity and file size?
a)
Resolution
b)
Pixel aspect ratio
c)
Monitor brightness
d)
Gamma correction
51.
A system stores sound at 96 kHz with 24-bit resolution. What is the bit rate for mono audio?
a)
2,304,000 bps
b)
1,024,000 bps
c)
512,000 bps
d)
3,072,000 bps
52.
Which compression method removes redundant patterns but keeps all data?
a)
Lossless
b)
Lossy
c)
Hybrid
d)
Predictive
53.
Which binary number is the two’s complement of 00110110₂?
a)
11001010.0
b)
11001001.0
c)
11100101.0
d)
10011010.0
54.
Why is hexadecimal preferred for representing machine code?
a)
It maps neatly to groups of 4 bits
b)
It compresses memory
c)
CPUs process hex directly
d)
It reduces execution time
55.
What happens when an image resolution doubles in BOTH width and height?
a)
File size becomes 4× larger
b)
File size stays the same
c)
File size becomes 2× larger
d)
File size becomes 8× larger
56.
Which is the denary range for 8-bit signed two’s complement?
a)
−128 to +127
b)
−255 to +255
c)
0 to 255
d)
−64 to +63
57.
Which is TRUE about Unicode compared to ASCII?
a)
Unicode uses more bits per character
b)
ASCII uses more bits
c)
Both store the same characters
d)
Unicode is obsolete
58.
Which operation ALWAYS doubles a positive binary integer?
a)
Logical left shift by 1
b)
Arithmetic right shift
c)
Two’s complement
d)
Bitwise NOT
59.
Which unit represents the largest data size?
a)
Tebibyte
b)
Terabyte
c)
Gigabyte
d)
Megabyte
60.
Which factor does NOT affect sound file size?
a)
Speaker wattage
b)
Sample resolution
c)
Number of channels
d)
Sample rate
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