09 - GCSE (Comp Systems) Part 1 (Exam simulation)

 1. Steve wants to run a 3D game simulation. A computer with 4 cores and 1 GHz clock speed is likely to run faster than a computer with 2 cores and a clock speed of 1.4 GHz.



 2. Identify four internal components (other than clock speed and cores) which could improve the performance of the computers. (4 marks)

 3. Explain one reason why the cache size affects the performance of the CPU. (2 marks)

 4. Steve also requires some secondary storage (long term, non-volatile storage). Name three options for storage Steve could select from (3 marks)

 5. The following steps explain the steps involved in the F-D-R cycle (in the CPU). Fill in the blanks for 1, 2, 5,6,7 and 8. (a mark per word = 6 marks)
1.An instruction is fetched from _________.
2.The instruction is then __________.
3. The decoded instruction is then executed so that 
4. the CPU performs continuously
5. The process is ____________.
6. The ______________. is incremented
7. The instruction is transferred to the _____.
8. The address of the instruction to be fetched is
placed in the ______.

 6. Define the term "embedded system". Examples of embedded systems include dishwasher, washing machine, mobile phone, manufacturing equipment. (2 marks)

 7. Von Neumann architecture revolutionised computing. The following excerpt shows the registers in use with definitions. Which definition is incorrect? (select the correct statement from the options below).
1. MAR // memory address register
Stores the address/location of data/instruction next to be processed 
2. MDR // memory data register 
Stores the data/instruction that is fetched/read from memory

3. PC // program counter
Stores the address/location of the next instruction to be run//or current instruction
Stores the result of manipulation/process/calculation 

  No 1 is incorrect. The MAR stores the value itself and not the address.

  None of the listed options are incorrect. All of them are valid registers with valid definitions provided.

  No 3 is incorrect. The program counter stores the actual data that is programmed into memory.

  No. 2 and No. 4 are incorrect. The MDR does not store the data fetched from memory. Definitions should be swapped.

 8. The CPU has a clock speed of 3.8 GHz. Describe what is meant by a clock speed of 3.8 GHz.

  All of the options listed here are valid answers for this question.

   the frequency that the clock "ticks"

  3.8 billion cycles/instructions per second

  The number of FDE cycles run per given time/second

 9. "My computer has a quad-core processor, so it will run twice as fast as a computer with a dual-core processor." Explain why this statement is not always true. (2 marks)

 10. A particular computer will only have 4GB of RAM, but Ruth suggests that virtual memory can be used instead of adding more RAM. Explain how virtual memory can compensate for the lack of RAM in Ruth's computer.

  VM is essentially the same thing as the Cache. When the Cache is full the RAM is filled with data.

  VM is used when RAM is full. It is part of the secondary storage (e.g. hard disk) used as temporary memory. The RAM is free to be filled with new data.

  VM is used when the RAM is empty. It is part of the primary memory.

  The VM is the same thing as optical secondary storage. A CD or DVD could be used when the RAM is full.

 11. Explain why it would be beneficial for Ruth to get more RAM instead of relying on virtual memory. (2 marks)

 12. Jonathan is creating a film for his church. He will be using a digital video camera.Why does this device need secondary storage? (2 marks)

 13. Jonathan's brother Pete has a digital camera with solid state storage. State five reasons why this type of storage is most suitable for a modern digital camera (4 marks)

 14. The videos are eventually transferred to a PC. The computer has 1GB of storage free. Calculate the number of videos that could be stored on the computer if each video was 100MB in size.

  10*100 = 1000 =1000 (videos)

  1024(1000) / 100 // 10*100 = 1000 = 10 (videos)

  2000/100 = 20; 20*100 = 200 videos

  1000 / 10 = 100 videos

 15. Jonathan can select from automatic backup options: Incremental or full backup. A full backup is time consuming but an incremental backup would _____________.

  take far more time, making it the less suitable choice if ever given one.

  take even more time, and all possible files would be incrementally saved.

  take less time, but every single file would have to be re-saved which is space-consuming.

  take less time, and only the changes made would need to be saved.

 16. The backup feature is considered a useful utility program. Name four other utility programs that modern computers tend to have. (4 marks)

 17. Jonathan will upload his films to youtube and release them under a Creative Commons license. Explain how a Creative Commons license will impact the use of Jonathan's videos by other people.

  Other people can freely distribute his work, he can choose to restrict editing and use, the work is still copyrighted, can insist on non-commercial use.

  Creative commons means that it is in the government-owned domain and can only be used or shared by government officials.

  Other people can not freely distribute his work, the restrictions under creative commons stop any distribution by other people.

  Other people can freely distribute their work but only if they are in a 'creative' industry (such as film making or graphic design).

 18. A house has computers in each room and a central router. Every room allows both Ethernet and WiFi connections to the router. Is the house network a LAN or WAN?

  None of these options are valid.

  it is a WAN because it is within a wide geographical area and has a company's (ISP) hardware to connect.

  It is a LAN because it is connected to the internet and it is local to the world.

  It is a LAN because it is within a small geographical area and has its own hardware/infrastructure.

 19. Ethernet refers to a _____________________and it is not (unlike WIFI) likely to be affected badly by interference.

  wired connection

  sattelite dish enabled connection

  wireless connection

  modem-less connection

 20. Using Ethernet, data is more likely to be transmitted at a faster speed and it has a longer transmission range before the data is lost (unlike WIFI).



 21. Describe the purpose of the router in a person's house? (4 marks)

 22. Carla, aged 83, wishes to connect to the internet in her home. She has a router. Name three other pieces of hardware she needs to do so. (3 marks)

 23. Name the system that matches URLs (e.g. to IP addresses (e.g. on the internet.

 24. Carla, now connected to the internet from her home, is susceptible to network threats associated with the internet. Name four such threats. (4 marks)

 25. A _______________ defines rules for data transmission. A _______________ also defines standards for data transmission

  transmission protocol

  modem handshake

  network protocol

  packet transfer

 26. A user wants to transfer a file directly from his computer to his friend's computer.What protocol comes into play here?

  IMAP protocol

  HTTPS / hyper text transfer protocol secure

  SSL protocol

  FTP / file transfer protocol

 27. A customer wants to securely log into her bank's website to check her account balance. What protocol comes into play here?

  SSL protocol

  IMAP protocol

  HTTPS / hyper text transfer protocol secure

  FTP / file transfer protocol

 28. The definitions for IMAP and SMTP below are correct. (Select 'True' if correct, and 'False' if you think they should be the other way round)
This is the protocol for sending email.
Sends/forwards/transmits e-mail 
This is the protocol for receiving email.
Retrieves/accesses/downloads (a copy of an) e-mail
Allows synchronisation/management of account 



 29. In today's world, many companies and organisations are opting for storing their data in the cloud. State three disadvantages of storing data in the cloud for employees and compay owners. (3 marks)

 30. Explain how defragmentation software could overcome the problem of a slow computer system. (3 marks)