Practice Quiz

ACT Science Exam Prep - Question List

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26. A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery, the compass needle changes position.Which of the following is the bestexplanation for the movement of the needle?
  1. The copper wire magnetizes the needle to create a force.
  2. The needle magnetizes the copper wire to create a force.
  3. The current in the wire produces a magnetic field and exerts a force on the needle.
  4. The insulation on the wire becomes energized and exerts a force on the needle.
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27. A heavy box is at rest on an inclined plane. The box begins to slide down the inclined plane when a small force is applied to the box. The force is removed as soon as the box begins to slide. The speed of the box increases as the box slides down the inclined plane.Which of the following is the most likely cause of this increasing speed?
  1. The force of gravity on the box is less when the box is not moving than when the box is moving.
  2. The force of gravity on the box is greater when the box is not moving than when the box is moving.
  3. The force of friction on the box is less when the box is not moving than when the box is moving.
  4. The force of friction on the box is greater when the box is not moving than when the box is moving.
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28. During what stage of embryonic development does organ differentiation occur?
  1. Morula
  2. Zygote
  3. Fetus
  4. Blastula
  5. Gastrula
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29. Which of the following statements about photosynthesis is false?
  1. Photosynthesis produces oxygen as a waste product.
  2. The dark reaction does not require sunlight.
  3. Photosynthesis takes place in the chloroplast.
  4. Sunlight needed for photosynthesis is stored in pigments such as chlorophyll.
  5. Photosynthesis results in the production of carbon dioxide.
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30. A person is using a force of 200 N to push a box. How much power does the person need to push the box a distance of 4 m in 10 s?
  1. 40 W
  2. 80 W
  3. 200 W
  4. 500 W
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