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Eighth Grade (Grade 8) Waves and Sound Questions

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Grade 8 Waves and Sound
Which types of waves are light waves?
  1. Transverse waves
  2. Longitudinal waves
  3. Surface waves
  4. Both transverse and longitudinal waves
Grade 8 Waves and Sound
A sound is produced                             .
  1. through chemical reactions
  2. by the movement of electrons
  3. when an object vibrates
  4. through gravitational forces
Grade 8 Waves and Sound
A sound is defined as                       .
  1. a form of light energy
  2. a type of vibration
  3. a chemical reaction
  4. a magnetic field
Grade 8 Waves and Sound
What happens during destructive interference?
  1. Waves cancel each other out
  2. Waves combine to create a larger wave
  3. Waves reflect off each other
  4. Waves change direction
Grade 8 Waves and Sound
We can hear sounds from around corners because of                .
  1. Diffraction
  2. Refraction
  3. Reflection
  4. Relaxation
Grade 8 Waves and Sound
The wavelength of a wave refers to                                                      .
  1. the distance between two successive crests or troughs
  2. the time it takes for a wave to complete one cycle
  3. the maximum displacement of particles in a medium
  4. the rate at which a wave moves through a medium
Grade 8 Waves and Sound
Generally, the interference is                                                .
  1. The interaction between two or more waves
  2. The reflection of waves
  3. The absorption of energy from vibrating objects
  4. The vibrations caused by wind
Grade 8 Waves and Sound
What causes the ocean water to be so blue in color?
  1. The Sun reflects the color of the sky off the ocean water.
  2. The bottom of the ocean floor is blue and that's what we see through the water.
  3. The ocean absorbs only blue colors from the Sun.
Grade 8 Waves and Sound
All waves transmit energy.
  1. True
  2. False
Grade 8 Waves and Sound
What part of your ear do sound waves travel through?
  1. ear canal
  2. eardrum
  3. ear lobe
  4. cochlea
Grade 8 Waves and Sound
Constructive interference occurs when                                                              .
  1. the crests of one wave align with the troughs of another wave
  2. the crests of one wave align with the crests of another wave
  3. the troughs of one wave align with the troughs of another wave
  4. the amplitude of the wave decrease
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
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