Practice Quiz

PreACT Exam Prep - Question List

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11. Which of the following is an example of a vector quantity?
  1. A student walks 2.0 km north.
  2. An object has a mass of 10.5 kg.
  3. A 1.0 kg object moves at 18 m/s.
  4. A ball has an instantaneous speed of 15 m/s.
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12. Radio waves, visible light, and x-rays are examples of electromagnetic waves that always differ from each other in
  1. amplitude.
  2. intensity.
  3. temperature.
  4. wavelength.
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13. The distance of the star Vega from Earth is 1.6 million times greater than the distance of the Sun from Earth. Which of the following best describes the gravitational influence of Vega on Earth?
  1. It is roughly equal to that of the Sun.
  2. Its influence is greater than that of the Sun.
  3. Its influence is small because of its distance.
  4. It influences the magnitude of Earth’s mass.
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14. Which of the following is the correct molecular formula for hydrobromic acid?
  1. HBrO
  2. HBr
  3. H2Br
  4. H2OBr
  5. H2O2Br
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15. Two identical beakers each contain 250 mL of water. The temperature of the water is 85°C in one beaker and 15°C in the other beaker. A drop of red food coloring is placed in each beaker at the same time. During the irst minute, which of the following is most likely to happen?
  1. The food coloring will spread out faster in the 85°C water than in the 15°C water.
  2. The food coloring will form a layer at the top of each beaker since it does not mix with water
  3. The food coloring will spread only halfway through the water in each beaker due to convection currents.
  4. The food coloring will settle faster at the bottom of the beaker containing 85°C water than at the bottom of the beaker containing 15°C water.
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