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Ninth Grade (Grade 9) Light and Optics Questions

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Grade 9 Light and Optics
A flat surface that produces an image by regular reflection is                  .
  1. a plane mirror
  2. a convex mirror
  3. a concave mirror
  4. none of the above
Grade 9 Light and Optics
The reflection of light off a shiny, smooth surface is                     .
  1. diffuse reflection
  2. regular reflection
  3. irregular reflection
  4. none of the above
Grade 9 Light and Optics
Which of the following is not true about the image formed by a concave lens?
  1. The image is formed on the same side of the object.
  2. The image is formed between the object and the lens.
  3. The image formed is always virtual, upright and diminished.
  4. The image is formed on the focal point.
Grade 9 Light and Optics
An object is placed 500 cm in front of a plane mirror. What happens when it is moved 50 cm closer to the mirror?
  1. The size of the image decreases.
  2. The size of the object increases.
  3. The size of the image is larger than the size of the object.
  4. The size of the image is the same as the size of the object.
Grade 9 Light and Optics
A man can see near objects clear but distance objects blurred. What can be done to correct this condition of vision?
  1. Wearing glasses with concave lenses
  2. Wearing glasses with convex lenses
  3. Using a magnifying glass
  4. Using a telescope
Grade 9 Light and Optics
Which of the following is not true about the brightness of light?
  1. The measurement of the amount of light output in a given area.
  2. The measurement of light output at a given time.
  3. The brightness of light is different at different distances from a light source.
  4. The power of the light source affects the brightness of light.
Grade 9 Light and Optics
How do we take care of our eyes?

I. Wear sunglasses to reduce glare
II. Have an eye check regularly
III. Use proper lightning
  1. I and II only
  2. I and III only
  3. II and III only
  4. I, II and III
Grade 9 Light and Optics
The scattering of light by a colloid is called the
  1. Boyle's Law
  2. Law of Conservation of Mass
  3. Charles Law
  4. Tyndall Effect
Grade 9 Light and Optics
Sunlight is comprised of which type or types of electromagnetic radiation?
  1. Gamma rays
  2. Visible light
  3. Ultraviolet light
  4. All of the above
Grade 9 Light and Optics
A particle of light energy is known as                .
  1. a proton
  2. an electron
  3. a neutron
  4. a photon
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