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J277/01 · 30 questions · auto-marked

Paper 1 mock

Multiple-choice mock of Computer systems. Submit for a score. Optional 35-minute timer. Nothing on the course is locked behind the mark.

J277/01 style, multiple choice only. 30 questions, 1 mark each.

Tick the timer if you want 35 minutes and an auto-submit. Leave it off to sit untimed.

Unanswered questions score 0. After submit you get a mark, an unofficial grade-region, and links to the units you missed.

This is not a real OCR paper (no extended 1.6 write-up, no working boxes). Use it as a scoreboard, then jump back into lessons.

30 questions

Use a 35-minute timer (auto-submits when it hits zero)

1 1.1.1 What is the main purpose of the control unit?

To store the operating system permanently To decode instructions and send control signals to other CPU parts To display windows on the screen To connect a LAN to the internet

2 1.1.1 Which register holds the data or instruction just copied from memory?

Program Counter (PC) Memory Address Register (MAR) Memory Data Register (MDR) Accumulator (ACC)

3 1.1.1 In the Von Neumann model, instructions and data are typically stored…

In two completely separate memories that never share a bus In the same memory, sharing a bus Only on optical discs Only in ROM

4 1.1.2 Increasing clock speed can improve performance because…

The CPU completes more fetch–execute cycles in the same time RAM becomes non-volatile The computer no longer needs secondary storage MAC addresses get longer

5 1.1.3 Which is the best example of an embedded system?

A school laptop used for many subjects The controller inside a dishwasher A desktop used for video editing and games A smartphone running arbitrary apps

6 1.2.1 RAM is described as volatile because…

It can only be written at the factory Its contents are lost when power is removed It is slower than magnetic tape It stores the BIOS forever

7 1.2.1 Virtual memory is used when…

The CPU has no ALU RAM is full and inactive pages are moved to secondary storage You compress a JPEG A switch forwards a frame

8 1.2.2 Why choose an SSD rather than a spinning HDD for a laptop that is carried every day?

SSDs always have more capacity for less money No moving parts, so more shock-resistant and usually faster SSDs are optical HDDs cannot store an operating system

9 1.2.3 How many bits are in a nibble?

2 4 8 16

10 1.2.4 What is the denary value of the binary number 00011110?

16 24 30 60

11 1.2.4 Convert the binary nibble-pair 1010 1111 to hexadecimal.

A9 AF F1 9A

12 1.2.4 A logical left shift of one place on a binary integer (no bits lost) is equivalent to…

Dividing by 2 Multiplying by 2 Adding 1 Converting to ASCII

13 1.2.4 Overflow occurs when…

A file is compressed The result of a calculation will not fit in the bits available Cache is larger than RAM A protocol uses HTTPS

14 1.2.4 Uncompressed bitmap size in bits is…

Width + height + colour depth Width × height × colour depth Colour depth only Width × height ÷ 8

15 1.2.5 Which statement about lossy compression is true?

The original bits can always be reconstructed exactly Some data is discarded and cannot be recovered It is only used for source code It always makes files larger

16 1.3.1 Which device connects a home LAN to the internet?

Switch Router NIC only Defragmenter

17 1.3.1 DNS is used to…

Encrypt a hard disk Translate a domain name into an IP address Compress sound Assign clock speed

18 1.3.1 A disadvantage of star topology is that…

Ethernet cannot be used Failure of the central switch can take down the LAN Every device needs its own WAN MAC addresses stop working

19 1.3.2 A MAC address identifies…

A website owner A network interface (hardware) on a LAN Only email servers The sample rate of a sound file

20 1.3.2 HTTPS is preferred over HTTP because…

It never uses DNS Data is encrypted in transit It is always slower, which is safer It replaces the need for an IP address

21 1.3.2 Which protocol is used to send email from one mail server to another?

IMAP SMTP FTP HTTP

22 1.4.1 Ransomware typically…

Speeds up virtual memory Encrypts files and demands payment for the key Translates domain names Draws a star topology

23 1.4.1 A brute-force attack on a login page is…

Trying many passwords or keys until one works Flooding a server until it falls over Tricking a person with a fake invoice Injecting SQL into a search box

24 1.4.2 A firewall is used to…

Allow or block network traffic according to rules Defragment a magnetic disk Convert binary to hex Store the BIOS

25 1.4.1 SQL injection attacks a system by…

Overheating the CPU Inserting malicious SQL into an input so the database runs it Guessing Wi-Fi PINs only Compressing packets

26 1.5.1 Device drivers exist so that…

The OS can communicate with a particular piece of hardware Clock speed can exceed 10 GHz safely HTTPS can replace HTTP Files become lossy

27 1.5.2 Defragmentation is intended for…

Solid-state drives, to wear the flash evenly Magnetic HDDs, to put scattered file blocks back together ROM chips in a microwave DNS servers

28 1.6.1 Using a stolen password to open a school database is covered mainly by the…

Data Protection Act 2018 Computer Misuse Act 1990 Copyright, Designs and Patents Act 1988 Highway Code

29 1.6.1 Selling a customer email list without a lawful basis most clearly breaks…

Computer Misuse Act Data protection law (DPA 2018 / UK GDPR) Only a school rule, never the law Binary addition

30 1.6.1 Open-source software means…

There is no copyright at all The source code is available and a licence grants use or modification under stated terms It cannot be used in schools It always costs more than proprietary software