TEST OF PRACTICAL KNOWLEDGE QUESTION
(a) Use the Fig 1 to answer questions (i) to (iv)
(i) What does Fig 1 represent?
(ii) Identify two output components in Fig 1.
(iii) Give the names of the parts labelled III, VI, VII.
(iv) State one precautionary measure that should be taken to protect the setup from power fluctuations while in use
(v) Data entry into system can be achieved through the parts labelled
(vi) Mention one device that can be used to access the part labelled VII.
(b) Figures 2 and 3 represent mass storage media. Use the figures to answer questions (i) to (iv)
(i) Identify the media represented by; Fig 2, Fig 3
(ii) The transaction files of a company are to be recorded and accessed in the order which they arrive. Which of the media is most suitable for the purpose?
(iii) In which media will the stored data be accessed faster?
(iv) State the file access method for each medium
Fig. 2
Fig 3
(c) A CCTV camera system has a 300 MB storage device. Each image size is 300 kB.
(i) How many images can be stored by the CCTV.
(ii) If the storage device is full, mention one one measures that should betaken to ensure that the system continues to capture and store image without loosing already stored images.
(a) Fig 1 (a computer set-up)
- (i) Fig 1 represents a computer system / computer set-up (computer connections).
- (ii) Two output components: the Monitor (labelled I) and the Speaker (labelled IV); the Printer is also an output device.
- (iii) Parts labelled: III = System Unit; VI = Power Supply / Socket; VII = Internet / Cloud.
- (iv) Precaution against power fluctuation: connect the set-up through an AVR, UPS, inverter, power stabiliser or surge protector.
- (v) Data entry is achieved through the Keyboard (labelled II) and the Mouse.
- (vi) The part labelled VII (Internet / Cloud) is accessed using a modem, VSAT or a mobile phone.
(b) Figs 2 and 3 (mass storage media)
- (i) Fig 2 = CD-ROM / DVD-ROM (optical disc); Fig 3 = magnetic tape / cassette.
- (ii) To record and access transaction files in the order they arrive, the most suitable medium is the magnetic tape (Fig 3).
- (iii) Stored data is accessed faster on the CD-ROM / DVD-ROM (Fig 2).
- (iv) File-access methods: Fig 2 (CD/DVD-ROM) uses direct (random) access; Fig 3 (magnetic tape) uses serial (sequential) access.
(c) CCTV storage calculation. The device holds 300 MB and each image is 300 kB. Taking \(1\,\text{MB} = 1000\,\text{kB}\):
\[ \text{Number of images} = \frac{300\,\text{MB}}{300\,\text{kB}} = \frac{300 \times 1000\,\text{kB}}{300\,\text{kB}} = 1000\ \text{images} \]
(c)(ii) When the device is full, back up the stored images to the cloud (or another medium) and then format the device, or replace it with a new storage device, so that capture continues without losing the images already saved.
(a) Fig 1 (a computer set-up)
- (i) Fig 1 represents a computer system / computer set-up (computer connections).
- (ii) Two output components: the Monitor (labelled I) and the Speaker (labelled IV); the Printer is also an output device.
- (iii) Parts labelled: III = System Unit; VI = Power Supply / Socket; VII = Internet / Cloud.
- (iv) Precaution against power fluctuation: connect the set-up through an AVR, UPS, inverter, power stabiliser or surge protector.
- (v) Data entry is achieved through the Keyboard (labelled II) and the Mouse.
- (vi) The part labelled VII (Internet / Cloud) is accessed using a modem, VSAT or a mobile phone.
(b) Figs 2 and 3 (mass storage media)
- (i) Fig 2 = CD-ROM / DVD-ROM (optical disc); Fig 3 = magnetic tape / cassette.
- (ii) To record and access transaction files in the order they arrive, the most suitable medium is the magnetic tape (Fig 3).
- (iii) Stored data is accessed faster on the CD-ROM / DVD-ROM (Fig 2).
- (iv) File-access methods: Fig 2 (CD/DVD-ROM) uses direct (random) access; Fig 3 (magnetic tape) uses serial (sequential) access.
(c) CCTV storage calculation. The device holds 300 MB and each image is 300 kB. Taking \(1\,\text{MB} = 1000\,\text{kB}\):
\[ \text{Number of images} = \frac{300\,\text{MB}}{300\,\text{kB}} = \frac{300 \times 1000\,\text{kB}}{300\,\text{kB}} = 1000\ \text{images} \]
(c)(ii) When the device is full, back up the stored images to the cloud (or another medium) and then format the device, or replace it with a new storage device, so that capture continues without losing the images already saved.
