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What unit of measurement is common to both the English system and to the metric system?
time
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What is the basis for metric units of length?
meter
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The mil is a measure of length equalto one one-thousandth of a/an..
inch
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What term defines the quantity of matter that a body contains?
Mass
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A given object will weigh the most under which of the following conditions?
When located at one of the earth’s poles
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Dynes and newtons are used in themetric system as units of
force
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The knot is a derived unit that combines the unit of distance with the unit of
time
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Under which of the following conditions may the term velocity be used in place of speed?
Only if the motion of the body is in a straight path in a given direction
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All units of power involve which ofthe following measurements?
Force, distance, and time
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All matter, regardless of its form,has mass and which of the following characteristics?
It occupies space
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Matter exists in three natural states. Of the following lists,which one contains the states of matter?
Solid, liquid, and gas
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The reluctance of an object tochange its speed, direction, orposition of rest is known as
inertia
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What term describes the quantitative measure of inertia?
Mass
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What name is given to the spacethrough which action-at-a-distance forces are effective?
Force field
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A vector has which of the following quantities?
Magnitude and direction only
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The attractive force exerted on abody by the earth is known as
gravity
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The weight of a body is determined by calculating the
force on the body exerted by gravity
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What mathematical calculation should you use to determine the specific gravity of a substance?
Divide the weight of the substance by the weight of an equal volume of water
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Over a given surface under pressure,what is the relationship between force per unit area and pressure?
Force is constant regardless of pressure changes
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A mass in motion is stopped. What happens to its kinetic energy?
It is converted to other forms of energy
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Which of the following statements describes an ion?
An atom with an overall neutral electrical charge
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The mass, and consequently theweight, of an atom is contained almost entirely in the
nucleus
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What is indicated by the atomic number assigned to an element?
The number of protons in its nucleus
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By what means can you determine the total number of protons and neutrons in an atom?
By its atomic weight
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Valence bonds hold ions together andform them into molecules. This action results from interaction between
outer-shell electrons
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What is the result of elements physically combining without undergoing a chemical change?
A mixture
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Molecules are constantly in motionin which of the following substances?
Gases, solids, and liquids
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Which of the following metals has the highest property of elasticity?
Bronze
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The accepted theory of gases assumes that gas molecules possess which ofthe following properties?
They exert equal pressure at all points on enclosing surfaces
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According to the kinetic theory,which of the following statements iscorrect concerning gases when absolute zero temperature is reached?
It is the temperature at whichall molecular activity stops
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Under some conditions, it is possible for the center of gravityto revolve around the center of
rotation
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In the study of masses in motion,which of the following is a description of the term acceleration?
A change in the body’s speed ordirection of travel
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The equations F = ma and a = F÷mgiven in the text are mathematical forms of Newton’s second law of motion. What do they indicate?
The mass of a body is dependent upon the acceleration it is give
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An automobile of a given mass traveling 60 MPH has the same momentum as one having twice that mass and traveling at what velocity?
30 MPH
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For a body to possess kinetic energy, it must be in which of thefollowing conditions?
In motion
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Increasing the mechanical advantageof force in a system affects theapplied force by
requiring less total energy to do the same work
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Relative to the center of revolution,the direction of (a) centrifugal force and (b) centripetal force is in what direction?
(a) Toward (b) away from
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The velocity of a wave depends onwhich of the following factors?
The type of wave and the medium through which it travels
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A single disturbance induced into amedium is known as a
wave pulse
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Which of the following is an exampleof waves that are both transverse and longitudinal?
Water waves
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The theory of radiation of energytreats radio, radar, and heat wavesas belonging to the same generalform of energy. What is theprinciple difference between thesewaves?
Frequency
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At what temperature does the Fahrenheit and Celsius scales coincide?
40° below zero
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What two temperature scales havetheir zero points corresponding to absolute zero?
Kelvin and Rankine
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Copper wires are not used forconductors through the glass envelopes of electron tubes for whichof the following reasons?
Copper and glass do not have thesame expansion rate
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The total increase in size of an object when heated depends on the amount of temperature change and which of the following factors?
Its coefficient of expansion
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For some uses, solid thermometers are more suitable than liquid-filled thermometers for which of thefollowing reasons?
Liquid thermometers have a limited temperature range
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The heat required to change a solid into a liquid with no change intemperature is known as the heat of
fusion
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Of several transparent substances,which one has the largest index of refraction?
The one with the greatest thickness
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A simple lens that is thicker in the center than at the edges is known as a
positive or convergent lens
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In a given medium, the color of alight wave is determined by which of the following factors?
The frequency only
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Of the several factors affecting sound velocity in any medium, whichones have the greatest effect?
Density and elasticity of the medium
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What is the minimum change in thesound level that the human ear can detect?
1.0 dB
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The audio power output from a speaker would double if the sound intensitywere increased by what amount?
3 dB
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What does a vu meter indicate?
The number of decibels above or below the input reference volume level
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Sound waves striking a highly reflective surface
Echo
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A vibrating force applied to an object at the object’s natural vibrating frequency
Resonance
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Two sound waves of slightly different frequency moving in the same direction
Beat note
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