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Light and sound Quiz for Grade 8

10 science questions on light and sound with answers, written for Grade 8. Use it as it is, change any question, print it with an answer key, or give it online and let it grade itself.

1.
What is the speed of light in a vacuum? (Multiple choice)
  1. 150,000 kilometers per second
  2. 300,000 kilometers per second
  3. 3,000 kilometers per second
  4. 1,000 kilometers per second
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300,000 kilometers per second

Light travels at approximately 300,000 kilometers per second in a vacuum.
2.
Which part of the ear is responsible for converting sound vibrations into electrical signals? (Multiple choice)
  1. Eardrum
  2. Cochlea
  3. Auditory canal
  4. Hammer
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Cochlea

The cochlea converts sound vibrations into electrical signals for the brain to interpret.
3.
Which phenomenon causes a pencil to appear bent when placed in a glass of water? (Multiple choice)
  1. Reflection
  2. Absorption
  3. Refraction
  4. Diffraction
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Refraction

Refraction bends light as it passes from one medium to another, making the pencil appear bent.
4.
Sound can travel through a vacuum. (True or false)
  1. True
  2. False
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False

Sound needs a medium like air or water to travel; it cannot travel through a vacuum.
5.
The unit used to measure the frequency of sound is _____ (Fill in the blank)
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Hertz

Frequency is measured in Hertz, which counts cycles per second.
6.
Name the type of wave that light is. (Identification)
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Electromagnetic wave

Light is an electromagnetic wave that does not require a medium to travel.
7.
Which color of visible light has the shortest wavelength? (Multiple choice)
  1. Red
  2. Violet
  3. Green
  4. Yellow
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Violet

Violet light has the shortest wavelength among visible colors.
8.
What happens to sound when it hits a hard surface? (Multiple choice)
  1. It is absorbed
  2. It is reflected
  3. It slows down
  4. It disappears
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It is reflected

Sound waves reflect off hard surfaces, causing echoes.
9.
Match each term with its correct definition. (Matching type)
1. Reflection
A. Bouncing back of light or sound waves
2. Refraction
B. Bending of light as it passes through different mediums
3. Frequency
C. Height of a wave related to its loudness or brightness
4. Amplitude
D. Number of waves passing a point per second
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1 = Bouncing back of light or sound waves; 2 = Bending of light as it passes through different mediums; 3 = Number of waves passing a point per second; 4 = Height of a wave related to its loudness or brightness

Each term is matched with its correct scientific definition.
10.
Give three sources of sound. (Enumeration)
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Vibrating strings, Human voice, Musical instruments

These are common sources that produce sound through vibrations.