3.3. Data storage
A subsection of Computer Science, 2210, through 3. Hardware
Listing 10 of 30 questions
A security system uses sensors, a camera and a microprocessor to capture images of each person entering a large shopping mall. Describe how the sensors, camera and microprocessor interact to identify certain people entering the mall. Each image taken requires 1 MB of storage. If the camera captures an image every 5 seconds over a 24 hour period, how much storage is required? Give your answer in gigabytes and show all your working. The shopping mall has over 100 cameras. At the end of each day all these cameras send their images, captured over the last 24 hours, to a central computer. Explain why the mall uses dedicated fibre optic cable rather than transmitting the data over the local broadband network.
2210_w15_qp_12
THEORY
2015
Paper 1, Variant 2
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A remote-controlled model car contains RAM, ROM and a solid state drive. The car receives radio signals from its remote control. It can only receive radio signals of a certain frequency. The manufacturer sets this frequency and the owner cannot change it. The owner of the model car can input their own sequence of movements from an interface underneath the car. Describe the purpose of each of the three types of memory supplied with the car. RAM ROM Solid state drive The owner needs to be able to enter their own sequence of movements for the model car. Name a suitable input device. Input device Give a reason for your choice of device. Explain why the model car uses a solid state drive rather than another type of secondary storage.
2210_w15_qp_12
THEORY
2015
Paper 1, Variant 2
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A section of computer memory is shown below: Address Contents 1000 0000 0110 1110 1000 0001 0101 0001 1000 0010 1000 1101 1000 0011 1000 1100 1000 1100 1000 1101 1000 1110 1000 1111 The contents of memory location 1000 0001 are to be read. Show the contents of the Memory Address Register (MAR) and the Memory Data Register (MDR) during this read operation: MAR MDR The value 0111 1001 is to be written into memory location 1000 1110. Show the contents of the MAR and MDR during this write operation: MAR MDR Show any changes to the computer memory following the read and write operations in part and part . Address Contents 1000 0000 0110 1110 1000 0001 0101 0001 1000 0010 1000 1101 1000 0011 1000 1100 1000 1100 1000 1101 1000 1110 1000 1111 Name three other registers used in computers. The control unit is part of a computer system. What is the function of the control unit?
2210_w15_qp_13
THEORY
2015
Paper 1, Variant 3
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A student uses a mobile phone to take photographs for a school project. The student needs to transmit the photographs to their computer. They could use serial data transmission or parallel data transmission to transmit the photographs. Describe how the photographs would be transmitted using serial data transmission. Give two benefits of transmitting the photographs using serial data transmission. State one benefit of the student using parallel data transmission instead of serial data transmission. The photographs are also transmitted across a network to cloud storage. A device on the network forwards the data towards its correct destination. State the name of this device. Describe what is meant by cloud storage. Give one disadvantage of storing the photographs in cloud storage instead of storing them locally.
2210_s23_qp_12
THEORY
2023
Paper 1, Variant 2
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Questions Discovered
30