Practice Quiz

MCAS Physics Exam Practice - Question List

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96. Which of the following is a scalar quantity?
  1. the mass of a brick
  2. the velocity of a falling tennis ball
  3. the force required to lift a 10 kg mass
  4. the acceleration of a toy car over a 60 s period
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97. A student is sitting in a large stadium far away from the starting line of a footrace, while listening to the footrace on the radio. As the race starts, the student hears the sound of the starting pistol on the radio. Shortly after that, the student hears the sound of the starting pistol from inside the stadium.Which of the following best explains these observations?
  1. Mechanical waves travel faster than electromagnetic waves.
  2. Electromagnetic waves travel faster than mechanical waves.
  3. The radio’s signal traveled a shorter distance than the sound wave traveled.
  4. The radio’s microphone was farther away from the starting line than the student was.
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98. People perceive sound differently in air than they do under water. Which of the following correctly compares the motion of sound waves in air and in water?
  1. Sound waves travel faster in air than in water.
  2. Sound waves travel slower in air than in water.
  3. Sound waves travel in air but do not travel in water.
  4. Sound waves travel at the same speed in air and in water.
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99. A car is parked on the side of a hill. Which of the following most likely prevents the car from moving down the hill?
  1. The car has too much mass to move easily.
  2. There is friction in the door hinges of the car.
  3. There is friction between the tires and the road.
  4. The weight of the car is mostly on the front wheels.
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100. Thermal energy is added to four identical 1.0 kg samples of water at room temperature. Which of the following increases in each sample?
  1. average charge of an electron
  2. average density of a nucleus
  3. average mass of a proton
  4. average speed of a molecule
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