Practice Quiz

MCAS Physics Exam Practice - Question List

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51. To locate objects in their environments, bats in flight and porpoises under water both use ultrasound waves with frequencies that are beyond human hearing. These animals produce an ultrasonic wave and then detect echoes from nearby objects.If a porpoise and a bat both produce ultrasonic waves when they are 16 m from an object, which animal would hear its echo first and why?
  1. The bat would hear its echo first because sound travels faster in air than in water.
  2. The porpoise would hear its echo first because sound travels faster in water than in air.
  3. The bat would hear its echo first because the amplitude of sound waves is greater in air than in water.
  4. The porpoise would hear its echo first because the amplitude of sound waves is greater in water than in air.
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52. Which of the following statements best explains why drops of liquid form on the outside of a glass of ice water on a hot day?
  1. Water molecules in the air are attracted to the surface of the glass.
  2. Water molecules in the ice water lose energy as they transfer heat to the air.
  3. Water molecules in the air lose energy as they transfer heat to the cold glass.
  4. Water molecules in the ice water move through the glass pores to the outside of the glass.
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53. Which of the following observations is a result of the Doppler effect?
  1. Noise from across a lake is louder at night than during the day
  2. A person walking notices that the pitch of a car’s engine decreases as the car passes by.
  3. Beats are produced when two tuning forks with different frequencies are heard together.
  4. A person hears the sound from a radio more clearly in certain areas of a room than in others.
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54. Electromagnetic waves of various frequencies reach Earth from distant parts of the universe. Which of the following can be inferred from this?
  1. The wavelengths must be very short.
  2. A single material must fill all of space.
  3. These waves can travel without a medium.
  4. The speed of these waves is 300,000,000 m/s.
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55. 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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