In this Grade 4 worksheet, students examine communication systems that depend on waves. They study how Morse code uses dots and dashes, how telephones turn voices into signals, how radios broadcast through radio waves, and how optical fibers send pulses of light through glass. Multiple-choice and fill-in-the-blank questions reinforce Grade 4 vocabulary like communication, signal, optical, and transmission, helping learners see how modern technology relies on waves to share information.
Style:
Waves: Light and Sound
Part A: Multiple Choice
Circle the best answer for each question.
1. In Grade 4 science, what kind of waves do radios use to send music to listeners?
A) Water waves
B) Sound waves only
C) Radio waves
D) Earthquake waves
2. Grade 4: Morse code uses short and long ___ to spell out letters.
A) Sounds or flashes
B) Colors
C) Smells
D) Tastes
3. Grade 4 question: optical fibers are thin glass strands that carry information using what?
A) Pulses of light
B) Strong magnets
C) Hot steam
D) Loud noise
4. In Grade 4 lessons, a telephone changes your voice into a ___ that travels along wires.
A) Signal
B) Color
C) Solid
D) Shadow
Part B: Fill in the Blank
Write the correct answer on each line.
1. In Grade 4 science, the system of dots and dashes used to send messages is called Morse code.
2. Grade 4: thin glass strings that carry pulses of light are called optical fibers.
3. Sending a message from a sender to a receiver is called communication in Grade 4 lessons.
4. An electrical message that carries information through wires is called a signal in Grade 4 science.
5. The act of sending a wave or signal between two places is called transmission in Grade 4 lessons.
Waves: Light and Sound
★ Part A: Multiple Choice
Circle the best answer for each question.
1. In Grade 4 science, what kind of waves do radios use to send music to listeners?
A) Water waves
B) Sound waves only
C) Radio waves
D) Earthquake waves
2. Grade 4: Morse code uses short and long ___ to spell out letters.
A) Sounds or flashes
B) Colors
C) Smells
D) Tastes
3. Grade 4 question: optical fibers are thin glass strands that carry information using what?
A) Pulses of light
B) Strong magnets
C) Hot steam
D) Loud noise
4. In Grade 4 lessons, a telephone changes your voice into a ___ that travels along wires.
A) Signal
B) Color
C) Solid
D) Shadow
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) In Grade 4 science, the system of dots and dashes used to send messages is called Morse code.
2) Grade 4: thin glass strings that carry pulses of light are called optical fibers.
3) Sending a message from a sender to a receiver is called communication in Grade 4 lessons.
4) An electrical message that carries information through wires is called a signal in Grade 4 science.
5) The act of sending a wave or signal between two places is called transmission in Grade 4 lessons.
Ready to Practice?
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9 Questions
12-18 minutes
Auto-graded
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