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81 Which device transforms mechanical energy into electrical energy?
(1) generator
(2) motor
(3) transformer
(4) mass spectrometer
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82 Power would most effectively be supplied to the primary coil of a step-up
transformer by
(1) an ac generator
(2) a dc generator
(3) a battery
(4) an ac motor
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83 The 200.-turn primary coil of a transformer is connected to a 120-volt
line. How many turns must the secondary coil of the transformer have if it is to
provide 240 volts? [Assume 100% efficiency.]
(1) 100
(2) 400
(3) 1,200
(4) 2,400
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84 Which device is used in the ignition system of a car to induce a time-varying
potential difference from the car’s battery?
(1) electric motor
(2) electromagnet
(3) transistor
(4) induction coil
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85 A helium-neon laser emits energy in the visible red region in the form
of
(1) alpha particles
(2) gamma rays
(3) electrons
(4) photons
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Group 4 — Geometric Optics
If you choose this group, be sure to answer questions 86–95.
86 The diagram below shows the letter P in front of a plane mirror.
Which diagram best represents the image of P produced by the plane mirror?
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87 A student stands 2.0 meters in front of a vertical plane mirror.
As the student walks toward the mirror, the image
(1) decreases in size and remains virtual
(2) decreases in size and remains real
(3) remains the same size and remains virtual
(4) remains the same size and remains real
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88 An incident light ray travels parallel to the principal axis of a concave
spherical mirror. After reflecting from the mirror, the light ray will travel
(1) through the mirror’s principal focus
(2) through the mirror’s center of curvature
(3) parallel to the mirror’s principal axis
(4) normal to the mirror’s principal axis
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89 The focal length of a concave spherical mirror is 0.060 meter. What
is the radius of curvature of the mirror?
(1) 0.060 m
(2) 0.12 m
(3) 8.3 m
(4) 17 m
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90 An image that is 1.0 × 10–2 meter tall is formed on a
screen behind a converging lens when an object 2.0 meters tall is placed
8.0 meters in front of the lens. What is the distance from the lens to the
screen?
(1) 2.5 × 10–3 m
(2) 4.0 × 10–2 m
(3) 2.5 × 10–1 m
(4) 4.0 × 10–1 m
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91 The diagram below shows an object placed between 1 and 2 focal lengths
from a converging lens. The image of the object produced by the lens is
(1) real and inverted
(3) virtual and inverted
(2) real and erect
(4) virtual and erect
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92 The focal length of a lens is not dependent on the
(1) material from which the lens is made
(2) color of the light incident on the lens
(3) distance of an object from the lens
(4) shape or curvature of the lens
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93 An object is placed 0.20 meter from a converging lens having a focal
length of 0.040 meter. The distance of the image from the lens is
(1) 0.033 m
(2) 0.050 m
(3) 0.16 m
(4) 0.20 m
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94 Images formed by diverging mirrors are always
(1) real and inverted
(2) real and erect
(3) virtual and inverted
(4) virtual and erect
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95 Spherical aberration is a defect associated with
(1) spherical mirrors, only
(2) plane mirrors, only
(3) both spherical mirrors and lenses
(4) both plane mirrors and lenses
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Group 6 — Nuclear Energy
If you choose this group, be sure to answer questions 106–115.
106 If nitrogen nuclei are bombarded with alpha particles they can be changed
into oxygen nuclei. This phenomenon is known as
(1) nuclear fission
(2) nuclear fusion
(3) artificial transmutation
(4) particle scattering
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107 One atomic mass unit is defined as
(1) the mass of an electron
(2) the mass of an alpha particle
(3) the mass of an atom of carbon-12
(4) the mass of an atom of carbon-12
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109 The nuclei of all the atoms in a single nuclide have
(1) the same number of neutrons and the same number of protons
(2) the same number of neutrons, but different numbers of protons
(3) different numbers of neutrons, but the same number of protons
(4) different numbers of neutrons and different numbers of protons
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110 What occurs when an atom emits gamma radiation?
(1) The excited nucleus changes to a more stable state by absorbing a photon.
(2) The excited nucleus changes to a more stable state by emitting a photon.
(3) The stable nucleus changes to an excited state by emitting a photon.
(4) The stable nucleus changes to an excited state by absorbing a photon.
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113 Which device can be used to detect subatomic particles that exit nuclei?
(1) Van de Graaff generator
(2) Geiger counter
(3) linear accelerator
(4) cyclotron
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114 In a nuclear reactor, which substance can be used as both the moderator
and the coolant?
(1) cadmium
(2) boron
(3) water
(4) uranium
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115 If the nucleus of an atom emits a positron, the atomic number of the atom
will
(1) decrease by one
(2) increase by one
(3) remain unchanged
(4) decrease by two
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