Practice Quiz

MCAS Physics Exam Practice - Question List

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76. X-ray waves and infrared waves are both electromagnetic waves. Which of the following describes another property x-ray waves and infrared waves share?
  1. Both waves are longitudinal.
  2. Both waves have the same frequency.
  3. Both waves have the same wavelength.
  4. Both waves travel at the same speed in a vacuum.
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77. Suppose a scientist detects an electromagnetic wave with a frequency higher than those of gamma rays. The scientist labels this wave a Z-ray.Which of the following would always be true of a Z-ray?
  1. A Z-ray would have a lesser amplitude than gamma rays.
  2. A Z-ray would have a greater amplitude than gamma rays.
  3. A Z-ray would have a shorter wavelength than gamma rays.
  4. A Z-ray would have a longer wavelength than gamma rays.
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78. The power of a toaster can be determined if which of the following values are known?
  1. the dimensions of the toaster
  2. the resistance of the toaster’s insulation
  3. the voltage applied to the toaster and the toaster’s temperature
  4. the current through the circuit and the voltage applied to the toaster
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79. How much power is required to carry a 35 N package a vertical distance of 18 m if the work on the package is accomplished in 30 s?
  1. 16 W
  2. 21 W
  3. 58 W
  4. 630 W
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80. 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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