Practice Quiz

Praxis II Physics Content Knowledge Exam Prep - Question List

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46.
The force on a charged particle moving in a direction perpendicular to a magnetic field is 0.50 N. What is the force on the particle in the same field if the angle between the particle's velocity vector and the field is 50°?
  1. 0.25 N
  2. 0.32 N
  3. 0.38 N
  4. 0.60 N
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47.
According to Maxwell's equations, a time-dependent magnetic field will be produced under which of the following circumstances?
  1. The total magnetic flux through a surface is equal to zero.
  2. A field exists that is the gradient of a scalar function.
  3. An electric field varies with time.
  4. The electric flux through surface is zero.
See answer
48.
Which of the following can be concluded about a region of space where the rate of change of the magnetic field is nonzero?
  1. An electric field will be produced.
  2. A harmonic electromagnetic wave will be produced.
  3. Electromagnetic waves in the visible spectrum will be produced.
  4. A magnetic material is present in the vicinity of the region.
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49.
A transducer is used to convert mechanical vibrations into electrical waves. The power output of the transducer is of the order of several microwatts. A scientist would like to increase this value so the signal can be recorded to magnetic tape. A circuit based primarily on which of the following components would be most appropriate for this purpose?
  1. Capacitors
  2. Diodes
  3. Transformers
  4. Transistors
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50.
An organ pipe is closed at one end. As the temperature of the gas inside the pipe increases, which of the following will also increase?
  1. The wavelength of the fundamental frequency.
  2. The ratio of the harmonics produced in the pipe.
  3. The speed of the waves produced in the pipe.
  4. The number of overtones produced in the pipe.
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