Input/Output (I/O) Devices

12 Grade 10 Computer Studies questions on Input/Output (I/O) Devices, with worked marking schemes. 12 questions are available on this topic in full.

1. Question 1

   4 marks

   Suggest a suitable output device for each of the following situations and give a reason for your choice in each case: (a) a petrol station that must produce a customer receipt quickly and quietly at the pump; (b) a learner who is blind and needs to read a class handout on her own.

   (4 marks)

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2. Question 2

   1 mark

   Which one of the following output devices produces a soft copy?

   A. Monitor

   B. Dot matrix printer

   C. Laser printer

   D. Plotter

   (1 mark)

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3. Question 3

   3 marks

   A hotel in Diani records staff attendance using a fingerprint reader instead of a written attendance register. State three advantages of using the fingerprint reader.

   (3 marks)

   Marking scheme

   Award 1 mark for each valid advantage, maximum 3. - A fingerprint is unique to an individual, so one worker cannot sign in on behalf of another (1). - The time of arrival and departure is captured automatically and accurately, removing guesswork or altered entries (1). - The records are stored directly in the computer, so attendance reports and payroll can be prepared quickly without retyping (1). - Nothing can be forgotten or lost, unlike a card, password or the register book itself (1). - Queuing time is reduced because each member of staff only needs a moment to be identified (1). - The record cannot easily be tampered with, which reduces disputes over hours worked (1).

4. Question 4

   4 marks

   Distinguish between an input device and an output device, giving one example of each.

   (4 marks)

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5. Question 5

   3 marks

   A commercial flower greenhouse near Naivasha is controlled by a computer. State three input devices used in the greenhouse and, in each case, state the data the device captures.

   (3 marks)

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6. Question 6

   1 mark

   A maize-buying centre in Kitale issues a delivery note to each farmer and must produce the original plus two carbon copies in a single printing operation. Which printer is most suitable?

   A. Dot matrix printer

   B. Inkjet printer

   C. Thermal printer

   D. Laser printer

   (1 mark)

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7. Question 7

   1 mark

   Which one of the following devices performs both an input and an output function?

   A. Joystick

   B. Touchscreen

   C. Plotter

   D. Light pen

   (1 mark)

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8. Question 8

   1 mark

   The resolution of a computer monitor refers to:

   A. the total number of colours the screen can produce

   B. the physical size of the screen measured diagonally

   C. the number of times per second the screen is refreshed

   D. the number of pixels the screen can display

   (1 mark)

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9. Question 9

   6 marks

   Explain three factors that the administration of a secondary school should consider when choosing a printer for the school office.

   (6 marks)

   Marking scheme

   Award 1 mark for each factor correctly named and 1 mark for a valid explanation of it. Maximum three factors, 6 marks. - Volume and speed of printing (1) – the office prints many circulars, mark sheets and examination papers, so a printer with a high pages-per-minute rating is needed to avoid delays (1). - Running cost (1) – the cost of toner, ink cartridges and paper per page affects the school budget more than the purchase price does (1). - Quality of output required (1) – official letters, certificates and examination papers must be sharp and legible, which favours a laser printer over a dot matrix (1). - Availability of consumables and after-sales service locally (1) – cartridges and repairs must be obtainable in the nearby town, otherwise the printer stands idle (1). - Noise level (1) – a quiet printer suits an office where staff and parents hold conversations (1). - Colour requirement (1) – colour is needed for charts, posters and school branding, otherwise a monochrome printer is cheaper (1). - Ability to be shared on the school network (1) – several office computers can then print to one machine, reducing cost (1). - Paper sizes and stationery handled (1) – the office prints on A4, A3 and pre-printed forms, so the printer must accept them (1).

10. Question 10

    4 marks

    The pharmacy of a county hospital in Kisumu uses a bar code reader at the dispensing counter. Explain two benefits of using the bar code reader instead of typing the product code by hand.

    (4 marks)

    Marking scheme

    Award 1 mark for each benefit stated and 1 mark for its explanation. Maximum two benefits, 4 marks. - Greater accuracy (1) – the code is read directly from the printed bars, so mistyped digits that could lead to the wrong medicine being issued are avoided (1). - Greater speed (1) – a single scan enters the whole code instantly, so patients are served faster and queues are shorter (1). - Automatic stock updating (1) – each scan reduces the recorded stock level at once, so the pharmacy knows immediately when a drug is running low or has expired (1). - Less staff training and fatigue (1) – the operator does not need typing skill or to concentrate on long code numbers throughout the shift (1).

11. Question 11

    1 mark

    A county education office is marking 5,000 answer sheets from a Grade 10 mock examination. Learners shaded their chosen answers in pencil, and the sheets are fed into a machine that detects the shaded positions and records the responses. Which input device does the office use?

    A. Optical mark reader

    B. Bar code reader

    C. Optical character reader

    D. Magnetic ink character reader

    (1 mark)

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12. Question 12

    1 mark

    A surveyor in Kajiado needs accurate A0-size maps of an irrigation scheme, drawn as continuous unbroken lines. Which output device is the most suitable?

    A. Plotter

    B. Thermal printer

    C. Dot matrix printer

    D. Laser printer

    (1 mark)

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