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Eighth Grade (Grade 8) Waves and Sound Questions

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Grade 8 Waves and Sound
What type of waves do mobile phones primarily use for communication?
  1. Mechanical waves
  2. Radio waves
  3. Ultraviolet waves
  4. Microwaves
Grade 8 Waves and Sound
What is the role of lenses in a microscope?
  1. To block the passage of light
  2. To reflect light
  3. To bend and focus light
  4. To make objects smaller
Grade 8 Waves and Sound
Grade 8 Waves and Sound
The primary difference between woodwind instruments and brass instruments is                                                                                 .
  1. woodwind instruments use reeds, while brass instruments do not
  2. woodwind instruments are made of wood, while brass instruments are made of metal
  3. woodwind instruments have keys, while brass instruments have valves
  4. woodwind instruments produce higher pitches than brass instruments
Grade 8 Waves and Sound
Which family of instruments includes violins, guitars, and banjos?
  1. Wind instruments
  2. Percussion instruments
  3. String instruments
  4. Brass instruments
Grade 8 Waves and Sound
Which experiment demonstrates the phenomenon of refraction?
  1. Placing a pencil in the water
  2. Observing an echo in a room
  3. Reflecting light off a mirror
  4. Bouncing a ball off a wall
Grade 8 Waves and Sound
What happens to the direction of reflected waves?
  1. They continue in the same direction
  2. They change direction completely
  3. They deviate from the original direction
  4. They split into multiple directions
Grade 8 Waves and Sound
The standing wave is                                                      .
  1. a wave that does not move
  2. a wave with a small amplitude
  3. a wave formed by the superposition of traveling waves
  4. a wave that reflects off a fixed point
Grade 8 Waves and Sound
What property of UV rays makes them potentially harmful to living organisms, especially DNA?
  1. Longer wavelengths
  2. Lower energy
  3. Shorter wavelengths
  4. Higher energy
Grade 8 Waves and Sound
A wave can be defined as                                                                       .
  1. the transfer of matter through a medium
  2. the transfer of energy through a medium without the transfer of matter
  3. the movement of particles in a circular motion
  4. the movement of particles in a straight line
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