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Eighth Grade (Grade 8) Light and Optics Questions

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Grade 8 Light and Optics
An object that transmits light with scattering can be described as                  .
  1. transparent
  2. translucent
  3. opaque
  4. none of the above
Grade 8 Light and Optics
When light is produced using heat, what is it called?
  1. Luminescence
  2. Incandescence
  3. Fluorescence
  4. Flammable
Grade 8 Light and Optics
Which types of waves are electromagnetic waves?
  1. Transverse wave
  2. Longitudinal wave
  3. Sound wave
  4. Water wave
Grade 8 Light and Optics
What is the main difference between microscopes and telescopes?
  1. Telescopes are used for distant objects, while microscopes are for nearby objects.
  2. Microscopes use mirrors, while telescopes use lenses.
  3. Telescopes use visible light, while microscopes use electron beams.
  4. Telescopes have three objective lenses, while microscopes have no lens at all.
Grade 8 Light and Optics
Which electromagnetic radiation possesses some of the shortest wavelengths and highest frequencies?
  1. Visible light
  2. Infrared waves
  3. Gamma rays
  4. Radio waves
Grade 8 Light and Optics
The electromagnetic spectrum is                                         .
  1. a range of all electromagnetic radiation
  2. a range of all sound waves
  3. a range of all visible light
  4. a range of all water waves
Grade 8 Light and Optics
What type of radiation is visible to the human eye?
  1. Ultraviolet light
  2. Infrared light
  3. Gamma rays
  4. Visible light
Grade 8 Light and Optics
Which of the following is NOT part of the electromagnetic spectrum?
  1. Radio waves
  2. X-rays
  3. Ultrasonic waves
  4. Microwaves
Grade 8 Light and Optics
What is the main purpose of a microscope?
  1. To observe distant celestial objects
  2. To magnify nearby objects that are too small to see with the naked eye
  3. To record sounds
  4. To measure temperature
Grade 8 Light and Optics
When the surface of a mirror curves inward, like the inside of a bowl, it is called a                .
  1. plane mirror
  2. concave mirror
  3. convex mirror
  4. diffuse mirror
Grade 8 Light and Optics
How does a white object appear to be white?
  1. It absorbs all colors of light
  2. It emits white light
  3. It reflects all colors of light
  4. It emits all colors of light
Grade 8 Light and Optics
What instrument uses lenses or mirrors to focus light from distant objects?
  1. microscopes
  2. optical Fibers
  3. telescopes
  4. lasers
Grade 8 Light and Optics
Which type of reflection occurs when light waves strike a smooth and polished surface?
  1. Regular reflection
  2. Diffuse reflection
  3. Refractive reflection
  4. Irregular reflection
Grade 8 Light and Optics
What type of microscope uses a beam of electrons for higher magnification and resolution?
  1. Light microscope
  2. Scanning tunneling microscope
  3. Electron microscope
  4. Refracting microscope
Grade 8 Light and Optics
What type of images do concave lenses form?
  1. Real images
  2. Enlarged images
  3. Virtual images
  4. Focal images
Grade 8 Light and Optics
Why do dark-colored clothes feel warmer on a sunny day?
  1. They reflect more light
  2. They absorb more light and transform it into heat
  3. They scatter light in all directions
  4. They emit their light
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