Grade 7

  In which type of material do sound waves travel fastest?

• liquids

• solids

• gases

• all of the above

What happens to the speed of sound waves in fluids, like air, when the temperature increases?

• It  depends on the density

• It remains constant

• It increases

• It decreases

Light that has passed through a polarizing filter is called

• polarized light.

• transverse light.

• white light

• photoelectric light.

What happens to the intensity of a sound wave as it moves away from its source?

• It depends on the medium

• It increases

• It decreases

• It remains constant

What is the phenomenon where light bends as it passes from one medium to another?

• Reflection

• Refraction

• Diffraction

• Dispersion

What determines the pitch of a sound wave?

• Amplitude

• Frequency

• Wavelength

• Speed

What is the unit of measurement for frequency?

• Watt

• Ohm

• Hertz

• Newton

What term describes your awareness of the energy of a sound?

• Intensity

• Pitch

•   Frequency

• Loudness

What type of image does a plane mirror produce?

• real and inverted

• virtual and inverted

• real and upright

• virtual and upright

Which statement is correct?

• A red apple reflects green light.

• A blue ball absorbs blue light.

• A green leaf reflects green light.

• A black shirt reflects all colors of light.