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Send and decode messages using patterns

4th grade (Year 5 in England) · 16 questions · Common Core: NGSS.4-PS4-3 · England: KS2 Computing links, KS2 Y4 Sound

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Date

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Question 1
A torch (flashlight) flashes short (•) and long (–) pulses. Use the key to decode the message. Key: S = ••• U = ••– N = –• Message: ••• / ••– / –•
Answer
Question 2
In Morse code, SNOW is sent as ••• / –• / ––– / •––. How many flashes (dots and dashes) is that altogether?
Answer
3
Question 3
Why is "SOS" (• • • / – – – / • • •) a good emergency signal?
- A. It is secret.
- B. Only ships can understand it.
- C. It is the longest message possible.
- D. It is a simple pattern that is easy to send and recognise with light or sound.
Question 4
A torch (flashlight) flashes short (•) and long (–) pulses. Use the key to decode the message. Key: S = ••• T = – A = •– R = •–• Message: ••• / – / •– / •–•
Answer
Question 5
In Morse code, STAR is sent as ••• / – / •– / •–•. How many flashes (dots and dashes) is that altogether?
Answer
6
Question 6
Why is "SOS" (• • • / – – – / • • •) a good emergency signal?
- A. Only ships can understand it.
- B. It is the longest message possible.
- C. It is a simple pattern that is easy to send and recognise with light or sound.
- D. It is secret.
Question 7
A torch (flashlight) flashes short (•) and long (–) pulses. Use the key to decode the message. Key: S = ••• U = ••– N = –• Message: ••• / ••– / –•
Answer
Question 8
In Morse code, CAT is sent as –•–• / •– / –. How many flashes (dots and dashes) is that altogether?
Answer
9
Question 9
Why is "SOS" (• • • / – – – / • • •) a good emergency signal?
- A. It is the longest message possible.
- B. Only ships can understand it.
- C. It is a simple pattern that is easy to send and recognise with light or sound.
- D. It is secret.
Question 10
A torch (flashlight) flashes short (•) and long (–) pulses. Use the key to decode the message. Key: T = – R = •–• E = • Message: – / •–• / • / •
Answer
Question 11
In Morse code, MOON is sent as –– / ––– / ––– / –•. How many flashes (dots and dashes) is that altogether?
Answer
12
Question 12
Why is "SOS" (• • • / – – – / • • •) a good emergency signal?
- A. It is a simple pattern that is easy to send and recognise with light or sound.
- B. It is the longest message possible.
- C. Only ships can understand it.
- D. It is secret.
Question 13
A torch (flashlight) flashes short (•) and long (–) pulses. Use the key to decode the message. Key: S = ••• T = – A = •– R = •–• Message: ••• / – / •– / •–•
Answer
Question 14
In Morse code, SOS is sent as ••• / ––– / •••. How many flashes (dots and dashes) is that altogether?
Answer
15
Question 15
Why are digital messages less likely to be spoiled by noise than older signals?
- A. They use no energy.
- B. Digital messages are louder.
- C. Each part is only on or off, so small changes are easy to ignore or correct.
- D. Noise cannot travel through air.
Question 16
A torch (flashlight) flashes short (•) and long (–) pulses. Use the key to decode the message. Key: C = –•–• A = •– T = – Message: –•–• / •– / –
Answer

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Answer key: Send and decode messages using patterns

1. SUN
2. 11
3. D. It is a simple pattern that is easy to send and recognise with light or sound.
4. STAR
5. 9
6. C. It is a simple pattern that is easy to send and recognise with light or sound.
7. SUN
8. 7
9. C. It is a simple pattern that is easy to send and recognise with light or sound.
10. TREE
11. 10
12. A. It is a simple pattern that is easy to send and recognise with light or sound.
13. STAR
14. 9
15. C. Each part is only on or off, so small changes are easy to ignore or correct.
16. CAT