Unit Test — Cumulative exam Answers
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Which types of electromagnetic waves have wavelengths that are longer than those of visible light but shorter than those of microwaves?
A
gamma raysB
X-raysC
infrared lightD
radio waves22
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Ingrid says that a red ball of clay appears red because the clay reflects red wavelengths. Simon says that the clay appears red because it allows red wavelengths to pass through it.Which statement best explains who is correct?
A
Ingrid is correct. The clay appears red because it reflects red wavelengths.B
Ingrid is correct. The clay appears red because it is a type of matter.C
Simon is correct. The clay appears red because it allows red wavelengths to pass through it.D
Simon is correct. The clay appears red because it is a solid.23
A component of a circuit changes, as shown below.
A
A switch is closed, so the circuit would be incomplete and broken and the lights in the circuit would not shine.B
A switch is closed, so the circuit would be complete and unbroken and the lights in the circuit would shine.C
A switch is opened, so the circuit would be incomplete and broken and the lights in the circuit would not shine.D
A switch is opened, so the circuit would be complete and unbroken and the lights in the circuit would shine.24
A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)
A
3.9 mB
4.0 mC
39.2 mD
40.0 m25
Mateo’s parents are thinking about investing money to help develop a new fusion power plant. Which issue is most important to consider before making the investment?
A
Fusion has never been controlled, so how have they succeeded in doing it?B
The fuel is quite limited, so have they discovered a more common fuel?C
Fusion has been generating electricity for decades, so why build another fusion power plant?D
Fusion requires high temperatures and pressures, so how have they reduced the energy cost for it?Did you find these answers helpful?
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