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Key Skills Worksheet: VC2TDI

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Key Skills Worksheet: VC2TDI

Mei, Cooper and Ivy are checking a digital system at a remote Australian weather station. Use the information in each question to investigate inputs, outputs, algorithms, data and testing. Choose or write the best answer.

How the station works

A digital system accepts input, processes information and produces output. Inputs can come from people or sensors; outputs can be displayed, played or printed.

1.The station measures air temperature with a sensor, calculates the daily average and shows the result on a screen. Which part is the input?

The temperature reading from the sensor
The calculated average
The screen display
The station building

2.Cooper types a note into the station computer. Name one input device he could use and one output device that could show his note.

3.Which statement best describes an algorithm?

A step-by-step set of instructions for completing a task
A physical part inside a computer
A collection of unrelated numbers
A message sent only by email

4.The station records temperature, wind speed and a spoken weather report. Select all three examples of data.

Temperature reading
Wind-speed reading
Recorded spoken report
The metal case around the computer

Follow the instructions

Ivy is creating an alert algorithm. Read the flow of steps and answer the questions.

1. Read the current temperature.

2. If the temperature is below 5°C, display “Frost warning”.

3. Otherwise, display “No frost warning”.

5.The sensor reads 3°C. What message should the algorithm display? Explain which instruction leads to that result.

6.The sensor reads exactly 5°C. What message should appear, based on the words “below 5°C”?

Find and fix the bug

A bug is an error in a program or its instructions. Testing with different inputs helps reveal bugs.

7.A program should display “Windy” when wind speed is greater than 40 km/h. It currently displays “Windy” for every reading. Describe one test input that could reveal the bug and the expected result.

8.Match each digital-systems term to its definition.

A. Input
B. Output
C. Algorithm
D. Bug

2. Information supplied to a system
4. Step-by-step instructions
3. Information produced by a system
1. A problem or error in a program

9.The station collected 12°C, 14°C and 16°C at three observation times. What is the average temperature? Show or describe your calculation.

10.Mei notices that a temperature display sometimes shows an impossible value of 999°C. Give one sensible check the program could use to flag this reading rather than treating it as normal weather data.

11.Plan a test for the frost-warning algorithm. Give two different test temperatures—one below 5°C and one at or above 5°C—and state the expected message for each.

12.Cooper wants to make the station safer to use. Write one practical rule for protecting the station’s data or account.