# Morse Code Multiple Choice Questions and Answers (MCQs) – 1

This set of Data Structures & Algorithms Multiple Choice Questions & Answers (MCQs) focuses on “Morse Code – 1”.

1. What is the length of the dot in Morse code?
a) 1 Unit
b) 7 Units
c) 5 Units
d) 3 Units

Explanation: In Morse Code, the length of the single dot is defined to be 1 Unit. While dash is defined to be 3 Unit. In Morse Code, the space between words is 7 unit.

2. Which of the following is used as signal duration in Morse Code?
a) Dash
b) Forward Slash
c) Apostrophe
d) Ampersand

Explanation: The two signal duration used in Morse code are Dot and Dash. They are also called Dits and Dahs. While other symbols are expressed in terms of dots and dash.

3. Morse Code is named after which scientist?
a) Samuel F. B. Morse
b) Karl Morse
c) Judea Pearl
d) Daniel C. Morse

Explanation: Morse Code is named after Samuel F. B. Morse who is the inventor of the telegraph. The best first search algorithm using heuristic evaluation rule or function was proposed by an Israeli – American computer scientist and philosopher Judea Pearl.

4. What is the basic unit of time measurement in Morse code transmission?
a) Dot duration
b) Dash Duration
c) Numeric Duration
d) Space Duration

Explanation: Dot duration is the basic unit of time measurement in Morse code transmission. Both dot and dash signal are used as time measurement in Morse code.

5. The dash duration is how many times the dot duration?
a) 1
b) 2
c) 3
d) 4

Explanation: The duration of a dash is 3 times the duration of a dot as duration of dot is defined to be 1 unit in Morse Code and duration of dash is 3 units in Morse Code.
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6. In Morse Code, each dot or dash within a character is followed by a period of signal absence. What is the name of that signal?
a) Slash
b) Space
c) Ampersand
d) Asterisk

Explanation: Each dot or dash within a character is followed by a period of signal absence called Space Signal which is of 1 Unit. The space signal is used after every word in Morse Code.

7. What is the duration of Space Signal?
a) Equal to Dot Duration
b) More than Dot Duration
c) Equal to Dash Duration
d) More than Dash Duration

Explanation: The duration of Space Signal is 1 Unit and Dot Duration is also 1 Unit. So the duration of Space Signal is equal to Dot Duration.

8. The letters of a word are separated by a space of how many durations?
a) 1 Dot Duration
b) 2 Dot Duration
c) 3 Dot Duration
d) 4 Dot Duration

Explanation: The letters of a word are separated by a space of 3 dot durations. Since the dot duration is of 1 Unit. So, the letters of a word are separated by a space of 3 Unit.

9. The words are separated by a space of how many durations?
a) 5
b) 6
c) 7
d) 4

Explanation: The words are separated by a space of 7 dot durations. Since the dot duration is of 1 Unit. So, the words are separated by a space of 7 Unit.

10. Is the letter “E” of English alphabet has the shortest code in Morse Code?
a) True
b) False

Explanation: Morse code was designed so that the length of each symbol is inverse to the frequency of occurrence in text. Therefore, the letter the letter “E”, has a single dot.

11. Is the letter “E” represented by the single dot in Morse code?
a) True
b) False

Explanation: The letter in English, “E”, has a single dot. It is considered to be the smallest Morse Code ever defined till now while other letters are larger in time duration.

12. What is meant by the single dash in Morse code?
a) A
b) T
c) Z
d) E

Explanation: The common letter in English, the letter “T”, has the shortest dash code: a single dash. While the letter in English, “E”, has a single dot. It is considered to be the smallest Morse Code ever defined till now while other letters are larger in time duration.

13. What is the Morse code for the distress signal is SOS?
a) 3 Dots, 3Dashes, and 3 Dots
b) 3 Dots, 3 Dashes, and 2 Dots
c) 3 Dots, 2 Dashes, and 3 Dots
d) 2 Dots, 3 Dashes, and 3 Dots

Explanation: In an emergency the distress signal is SOS– 3 dots, 3 dashes, and 3 dots – internationally recognized by treaty. It is used to call emergency help when someone is in need.

14. For which device was Morse code developed for?
a) Telegraphy
b) Stethoscope
c) Telephone
d) SONAR

Explanation: A code was needed to transmit natural language using only the pulses in a telegraph system. Morse developed the modern International Morse code.

15. When was Morse system for telegraphy first used?
a) 1843
b) 1844
c) 1845
d) 1846

Explanation: Morse system for telegraphy was first used in 1844 to make indentations on a paper tape when electric currents were received.

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