1 - Theory of Computer Science / Input Devices (Automatic)

Exam Questions - Input Devices (Automatic)

Example Question 1

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Question 1 requires you first to link an input device to its description and then to link the description to an application.

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Example Question 2

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(a) Question 2 (a) Asks you to describe how a bar code scanner reads a barcode. 

Each of the following points would be worth one mark (Max 4)
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  1. Shines light / (Red) laser at barcode
  2. Light is called an illuminator
  3. Light is reflected back // White lines reflect light // Black lines reflect less light
  4. Sensors detect the light
  5. Different reflections will be given different binary numbers
  6. Microprocessor interprets the data

​(b) Question 2 (b) asks you to explain how a bar code can be used to help manage stock.

Each of the following points would be worth one mark (Max 3)

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  1. Barcode identifies a (Unique) product
  2. Barcode can be used to look up a product (In a database)
  3. Data about stock levels can be stored on a system
  4. Stock can be automatically deducted from the system
  5. Can check stock is below a certain level
  6. Automatic re-order
  7. Automatically update new stock level
  8. To locate if an item of stock is available in another location.

Example Question 3

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Question 3 asks you to explain how captured images are converted into digital files. For this question you will also need to call upon knowledge from the binary and files section that discusses how bitmap images work.

Each of the following points are worth 1 mark (Max 3)
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  1. Image is converted from analogue to digital using a ADC
  2. Image is turned into pixels
  3. Each pixel is given a binary value
  4. Pixels form a grid (To create the image)
  5. Each pixel has a colour
  6. Pixels are stored in a sequence
  7. Meta data is stored
  8. An example of a suitable file photo format e.g. JPEG


Example Question 4

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4

Question 4 asks you to link sensor names to suitable applications

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Example Question 5

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(a) Question 5 (a) starts by asking you to name two sensors and for each of the sensors named you must give an example use.  There are many options to choose from here:

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(b) Part b asks you to explain how sensors and a microprocessor are able to monitor a process. Here you should think about using the script provided above and the correct way to structure control / monitoring system questions.

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