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CS Online Test 4

This document contains a 10 question computer science test covering topics like sensors, data transmission, printers, barcodes, logic circuits, checksums, and computer architecture. It asks students to identify applications of different sensors and printers, describe how infrared sensors and a microprocessor control automatic doors, identify USB data transmission and reasons for its use, convert barcode values between denary, hexadecimal and binary, draw and complete truth tables for logic circuits using AND, OR and NOT gates, calculate checksum values, and identify sensors, processes and how a microprocessor monitors a chemical factory.

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Richard Fernandez
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103 views3 pages

CS Online Test 4

This document contains a 10 question computer science test covering topics like sensors, data transmission, printers, barcodes, logic circuits, checksums, and computer architecture. It asks students to identify applications of different sensors and printers, describe how infrared sensors and a microprocessor control automatic doors, identify USB data transmission and reasons for its use, convert barcode values between denary, hexadecimal and binary, draw and complete truth tables for logic circuits using AND, OR and NOT gates, calculate checksum values, and identify sensors, processes and how a microprocessor monitors a chemical factory.

Uploaded by

Richard Fernandez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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A4 IGCSE School

0478 Computer Science


Test 1 (November)

1. (a) Draw a line to link each sensor to its most appropriate application.

[5]

(b) Automatic doors in a building are controlled by the use of infrared sensors and a
microprocessor. Describe how the sensors and the microprocessor are used to
automatically open a door as a person approaches. [4]

2. A student wishes to print out some documents and connects his printer to the using USB
port.
(a) Identify what type of data transmission is being used. [1]
(b) Give three reasons for using a USB port. [3]
3. State one suitable application for each printer below. A different application must be given
for each printer.
• Inkjet printer
• 3D printer
• Dot matrix printer [3]

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A4 IGCSE School

4. Name a type of barcode which can store up to 7000 digits. And this barcode contains the
denary value 5 5 3 0. Convert this value to hexadecimal. Also write this value as a 12-bit
binary number. This type of barcode is used in a train station to advertise local places of
interest. Describe how a visitor reaching at the train station could use these barcodes to
help plan their visit. [8]

5. Draw a line to link each description to the correct device. [6]

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A4 IGCSE School

6. Draw a logic circuit and complete truth table for the following logic statement.
X = 1 if ( ( A is 1 OR B is 1) AND (A is 1 AND B is 1) ) OR (C is NOT 1) [10]

7. Redraw the following logic circuit using NAND gates only and compare complete truth
tables for both logic circuits. [12]

8. Calculate step by step the checksum for blocks of data with the following byte sums:
• 2879
• 7777 [10]

9. The processes in a chemical factory are monitored by sensors connected to a


microprocessor. Identify two different sensors used in this application. Give an example
of how each sensor could be used in the chemical factory.
Explain how the sensors and a microprocessor are used to monitor a process. [9]

10. Name three types of bus used in computer architecture and describe a description for only
one of these buses. [4]

############# END ############

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