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21. An immersion heater has a resistance of 5.0 ohms while drawing a current of
3.0 amperes. How much electrical energy is delivered to the heater during 200. seconds
of operation?
(1) 3.0 × 103 J
(2) 6.0 × 103 J
(3) 9.0 × 103 J
(4) 1.5 × 104 J
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22. The diagram below represents part of an electric circuit containing three resistors.
What is the equivalent resistance of this part of the circuit?
(1) 0.67 Ω
(2) 1.5 Ω
(3) 6.3 Ω
(4) 19 Ω
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23. In the circuit represented by the diagram below, what is the reading of voltmeter
V?
(1) 20. V
(2) 2.0 V
(3) 30. V
(4) 40. V
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24. A transverse wave passes through a uniform material medium from left to right,
as shown in the diagram below.
Which diagram best represents the direction of vibration of the particles of the
medium?
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25. The diagram below shows a ray of light passing from air into glass at an angle
of incidence of 0°.
Which statement best describes the speed and direction of the light ray as it passes
into the glass?
(1) Only speed changes.
(2) Only direction changes.
(3) Both speed and direction change.
(4) Neither speed nor direction changes.
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Note that question 26 has only three choices.
26. A ray of monochromatic light is incident on an air-sodium chloride boundary
as shown in the diagram below. At the boundary, part of the ray is reflected back
into the air and part is refracted as it enters the sodium chloride.
Compared to the ray’s angle of refraction in the sodium chloride, the ray’s
angle of reflection in the air is
(1) smaller
(2) larger
(3) the same
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27. Which pair of terms best describes light waves traveling from the Sun to Earth?
(1) electromagnetic and transverse
(2) electromagnetic and longitudinal
(3) mechanical and transverse
(4) mechanical and longitudinal
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28. Which wave characteristic is the same for all types of electromagnetic radiation
traveling in a vacuum?
(1) speed
(2) wavelength
(3) period
(4) frequency
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29. If the speed of a wave doubles as it passes from shallow water into deeper water,
its wavelength will be
(1) unchanged
(2) doubled
(3) halved
(4) quadrupled
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30. Radio waves diffract around buildings more than light waves do because, compared
to light waves, radio waves
(1) move faster
(2) move slower
(3) have a higher frequency
(4) have a longer wavelength
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31. A metal sphere has a net negative charge of 1.1 × 10-6 coulomb. Approximately
how many more electrons than protons are on the sphere?
(1) 1.8 × 1012
(2) 5.7 × 1012
(3) 6.9 × 1012
(4) 9.9 × 1012
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32. Light of wavelength 5.0 × 10-7 meter consists of photons having an
energy of
(1) 1.1 × 10-48 J
(2) 1.3 × 10-27 J
(3) 4.0 × 10-19 J
(4) 1.7 × 10-5 J
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33. Wave-particle duality is most apparent in analyzing the motion of
(1) a baseball
(2) a space shuttle
(3) a galaxy
(4) an electron
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34. The tau neutrino, the muon neutrino, and the electron neutrino are all
(1) leptons
(2) hadrons
(3) baryons
(4) mesons
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35. Which statement is true of the strong nuclear force?
(1) It acts over very great distances.
(2) It holds protons and neutrons together.
(3) It is much weaker than gravitational forces.
(4) It repels neutral charges.
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36. The approximate height of a 12-ounce can of root beer is
(1) 1.3 × 10-3 m
(2) 1.3 × 10-1 m
(3) 1.3 × 100 m
(4) 1.3 × 101 m
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37. Which physical quantity is correctly paired with its unit?
(1) power and watt•seconds
(2) energy and newton•seconds
(3) electric current and amperes/coulomb
(4) electric potential difference and joules/coulomb
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38. In the diagram below, S is a point on a car tire rotating at a constant rate.
Which graph best represents the magnitude of the centripetal acceleration of point
S as a function of time?
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39. When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0
newtons per meter, the spring is compressed 0.500 meter. How much energy is stored
in the spring?
(1) 3.75 J
(2) 7.50 J
(3) 15.0 J
(4) 30.0 J
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40. The current through a lightbulb is 2.0 amperes. How many coulombs of electric
charge pass through the lightbulb in one minute?
(1) 60. C
(2) 2.0 C
(3) 120 C
(4) 240 C
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