PHS 112: Physical Science II Test 2

If a 500-W heater carries a current of 4.0 A, what is the voltage across the ends of the heating element? A. 2000 V B. 125 V C. 250 V D. 0.008 V

B. 125 V Use V = P/I

The potential difference across a 5-ohm resistor that carries a current of 5 A(amps) is: A. 100 V B. 25 V C. 4 V D. 1 V

B. 25 V Multiply ohm and amps

The magnetic domains in a magnetized piece of iron are characterized by which orientation? A. Anti-aligned with the magnetic axis B. Aligned with the magnetic axis C. Perpendicular to the magnetic axis

B. Aligned with the magnetic axis

You have all the lamps in your house wired with a series circuit. What happens when one bulb burns out? A. Nothing, the other lamps continue to burn. B. All of the lamps go out C. That one lamp grows darker, and the others glow brighter. D. That one lamp grows darker, and the others glow dimmer.

B. All of the lamps go out Note: It's a one-way path

An electric current is measured in the units of: A. Bolt B. Amp C. Watt

B. Amp

A magnetic field is produced by: A. Static negative charges B. An electric current C. Static positive charges

B. An electric current

Invented "Xerography," a dry-copy imaging process (copy machine): A. Oersted B. Carlson C. Galvani

B. Carlson

Which of the following is NOT a semi-conductor? A. Carbon B. Copper C. Germanium

B. Copper

Developed a law for the force between two electric charges: A. Volta B. Coulomb C. Oersted

B. Coulomb

A motor used a _________ current to produce ___________ while a generator uses ____________ to produce ___________. A. Rotary motion, Current, Current, Rotary motion B. Current, Rotary motion, Rotary motion, Current C. Current, Rotary motion, Current, Rotary motion

B. Current, Rotary motion, Rotary motion, Current

The magnitude of the electric force between two (2) charges is: A. Inversely proportional to the distance between them B. Directly proportional to the product of the magnitudes of the two (2) charges C. Proportional to the charge of only one (1) of them D. Proportional to the distance between them cubed

B. Directly proportional to the product of the magnitudes of the two (2) charges

A magnetic field is produced: A. Only by a permanent magnet B. Electric charges in motion C. Electric charges at rest D. Electric charges both at rest and in motion

B. Electric charges in motion

The Greek word for amber is: A. Proton B. Electron C. Neutron

B. Electron/"Elektron"

An instrument capable of detecting, characterizing, and roughly estimating the magnitude of a charge is a(n): A. Polariscope B. Electroscope C. Oscilloscope

B. Electroscope

A device consisting of a strip of metal with a low melting point is a: A. Circuit Breaker B. Fuse C. Relay

B. Fuse

A ___________ operates on the reverse principle of a motor; a coil of wire is mechanically turned within a magnetic field to produce electricity. A. Transformer B. Generator C. Motor

B. Generator

A bird on a high voltage wire is electrocuted when the potential difference is: A. Low B. High C. Zero

B. High

Electricity by mechanical means is called electromagnetic... A. Conduction B. Induction C. Reduction

B. Induction

The substance that contains the highest density of free electrons is: A. Hard rubber B. Iron C. Amber D. Glass

B. Iron

A magnet may lose its magnetism when dropped onto a hard surface because: A. It will break into a north and south pole, thus destroying the magnet B. It will destroy the alignment of the domains inside the magnet C. The magnet will be affected only if the floor is magnetic D. None of the above

B. It will destroy the alignment of the domains inside the magnet

If a bar magnet is heated: A. It will lose some of its magnetism because iron atoms lose their magnetism when heated. B. It will lose some of its magnetism because the magnetic domains wiggle out of alignment. C. It will become more magnetic because iron atoms become more magnetic when heated.

B. It will lose some of its magnetism because the magnetic domains wiggle out of alignment.

The statement that like charges repel each other; unlike changes attract is the basis of the: A. Electron Theory of Matter B. Law of Electric Charges C. Conservation of Charge D. Law of Electrostatic Force

B. Law of Electric Charges

Discovered the first natural magnet, lodestone: A. Thales B. Magnes C. Joule

B. Magnes

One millionth of an ampere is a: A. Milliamp B. Microamp C. Kiloamp D. Nanoamp

B. Microamp

A north pole of a magnet will be: A. Attracted to another north pole B. Repelled by another north pole C. Repelled by a south pole D. Unaffected by other magnets

B. Repelled by another north pole

In a television set, _________ complete sweeps occur across the screen in 1 second to produce a picture. A. 40 B. 60 C. 30

C. 30

A 12-volt car battery is connected to a headlight which has a 3-ohm resistance. The current through the lamp is: A. 36 amps B. 36 watts C. 4 amps D. 4 watts

C. 4 amps Note: the I = V/R formula is used here

The unit of electric charge is called: A. An Electron B. An Ampere C. A Coulomb D. An Ohm

C. A Coulomb

A positively charged object will attract and be attracted by: A. Another positively charged object B. A neutral object C. A negatively charged object D. All of the above

C. A negatively charged object

One common use for electromagnetism is: A. Generators B. Electric Motors C. All the above

C. All the above

The force of attraction between two charge spheres can be calculated from: A. Ohm's Law B. Joule's Law C. Coulomb's Law

C. Coulomb's Law

Animal electricity if characteristic of the eel, electric ray, and the: A. Trout B. Bass C. Electric catfish

C. Electric catfish

An electrical conductor has: A. Low mass density B. High tensile strength C. Electric charges that move freely D. Good heat conductivity

C. Electric charges that move freely

Generators, motors, radio, TV, and the telephone depend on: A. Transformers B. Thermodynamics C. Electricity

C. Electricity

Lightning is one of the four natural manifestations of: A. Magnetism B. Dynamics C. Electricity

C. Electricity

An instrument for determining the magnitude of a charge is the: A. Van De Graaff generator B. Electrostatic precipitator C. Electroscope

C. Electroscope

When the utility bill arrives at the end of the month, we pay the utility company for the ____________ of the electric current and not for the electricity itself. A. Resistance B. Velocity C. Energy

C. Energy

Called the Father of the Modern Electrical Age: A. Franklin B. Oersted C. Faraday

C. Faraday

Proved that the planet, Earth, was a magnet by using lodestone: A. Magnes B. Coulomb C. Gilbert

C. Gilbert

The interest of the early ________ thinkers was in static electricity. A. French B. Roman C. Greek

C. Greek

The first person to recognize the connection between electricity and magnetism was: A. Benjamin Franklin B. Charles Coulomb C. Hans Christian Oersted

C. Hans Christian Oersted

Developed a law relating power, voltage, and current: A. Ohm B. Franklin C. Joule

C. Joule

Developed a law relating current, voltage, and resistance: A. Carlson B. Joule C. Ohm

C. Ohm

Which of the following is not an insulator? A. Glass B. Amber C. Radium

C. Radium Note that it's a metal

If more and more appliances are plugged into a series circuit, the total current in the line: A. Increases B. Decreases C. Remains unchanged D. Alternates

C. Remains unchanged

Discovered the "Amber Phenomenon": A. Coulomb B. Magnes C. Thales

C. Thales

A light bulb will row because: A. There is a burning inside B. An electric current will glow C. The filament is hot

C. The filament is hot

Which of the following objects does not emit light? A. Candle flame B. The sun C. The moon D. A burning coal

C. The moon

The device used to alter voltage and current: A. Electric Motor B. Generator C. Transformer

C. Transformer

Which of the following is a unit of energy? A. Kilowatt B. Watt C. Watt-hour D. Both and A and B E. All of the above

C. Watt-hour

A device that measures voltage and current to determine power by multiplication is: A. Ohm Meter B. Ammeter C. Wattmeter

C. Wattmeter

What are 3 semi-conductors?

Carbon, Silicon, and Germanium

What is the most widely used conductor?

Copper

An object becomes positively charged by gaining protons.

False (Gained by losing electrons)

How much resistance (R) is there in a circuit where the voltage (V) is 250 volts and the current (I) is 3.92 amperes? Which formula is used here?

Ohm's Law: R = V/I

What are some Conductors?

Platinum, Gold, Silver, Copper, Aluminum

Charge moving through a wire produces a magnetic field around the wire.

True

The internal memory of a computer containing its operating instructions is called the RAM.

True

The reading on your electric bill shows the amount of power you have used in a month.

True

The volt is a measure of the difference in electrical potential energy between two points.

True

If a 75-W light bulb operates at a voltage of 120 V, the current in the bulb is: A. 0.63 A B. 1.6 A C. 0.009 A D. 0.00011 A

A. 0.63 A

The current in a 60-watt, 120-volt lamp is, by the way of the formula, P = V x I, where P = power in watts, V = volts, and I = current in amperes: A. 1/2 amp B. 2 amps C. 90 amps D. 7200 amps

A. 1/2 amp

Three (3) resistors having values 4, 6, and 8 ohms are connected in "series." Their equivalent resistance is: A. 18 ohms B. 8 ohms C. 6 ohms D. 1.8 ohms

A. 18 ohms Add up all of the values

A current is forced by a magnet in this device to produce mechanical work: A. Electric Motor B. Generator C. Transformer

A. Electric Motor

An electric current in a wire is a flow of: A. Electrons B. Protons C. Ions

A. Electrons

When a glass rod is rubbed with silk, A. Electrons are removed from the rod B. Protons are removed from the silk C. The silk is charged positively D. The glass remains neutral

A. Electrons are removed from the rod

Demonstrated that a lightning strike was an electric discharge: A. Franklin B. Faraday C. Gilbert

A. Franklin

Demonstrated the existence of animal electricity: A. Galvani B. Volta C. Gilbert

A. Galvani

A magnet: A. Has two poles B. Can be made of any metal C. Must be wrapped in wire D. Exhibits static electricity

A. Has two poles

Ohm's Law is correctly expressed by: A. I = V/R B. V = R/I C. I = V/R

A. I = V/R

Regions where the magnetic fields of atoms are lined up in the same direction are known as: A. Magnetic Domains B. Dynamos C. Superconductors

A. Magnetic Domains Note: They have to be lined up together in a parallel sense (like uncooked spaghetti in a bag).

Discovered the connection between magnetism and electricity: A. Oersted B. Faraday C. Magnes

A. Oersted

A divided electric circuit that provides more than one path for the current is: A. Parallel B. Series C. Composite

A. Parallel Note: the multiple "p's" that appear in the question, and that parallel is multiple circuits in comparison to a series circuit (only 1)

The best electrical conductor is: A. Platinum B. Gold C. Silver

A. Platinum

A device that HINDERS the motion of charge through a circuit is called a: A. Resistor B. Capacitor C. Potentiometer

A. Resistor

In order to produce an electric current with only a magnet and some wire, you should: A. Shape the wire into the form of a coil and move the magnet in and out of the coil. B. Stretch the wire into a long straight piece and hold it near the magnet. C. Wrap the wire around the magnet. No movement is necessary.

A. Shape the wire into the form of a coil and move the magnet in and out of the coil.

Which of the following does not produce a magnetic field? A. Stationary electric charge B. Moving electric charge C. An electromagnet

A. Stationary electric charge Note: It isn't moving

Proved that electricity came from dissimilar metals: A. Volta B. Gilbert C. Galvani

A. Volta

During a lightning storm, is it safer in your car or outside? A. Your car is safer B. Outside is safer C. They are both equally safe.

A. Your car is safer (due to rubber tires)

What is the force of electrical attraction (F) between the electron (q1) and the proton (q2) in the carbon atom when the distance, r = 2.84, K = 7582, q1 = 18.32, and q2 = 17.65? Which formula is used for this problem?

Coulomb's Law: F = [k(q1q2/r^2)]

Three (3) resistors having values 4, 6, and 10 ohms are connected in "parallel." Their equivalent resistance is: A. 20 ohms B. 7.3 ohms C. 6.0 ohms D. 1.9 ohms

D. 1.9 ohms Add all numbers as if they were the denominator of a fraction ( 1/4 + 1/6 + 1/10)

Which of the following represents a use of magnets in our everyday life? A. Seal on doors B. Speakers in electronic equipment C. Health scanning machines (MRIs/magnetic resonance imagers) D. All of the above

D. All of the above

The magnitude of the resistance of a wire depends on: A. The length of the wire B. The cross-sectional area of the wire C. The temperature of the wire D. All of these are true

D. All of these are true

When a switch is closed in an electric circuit, A. Electrons flow through the conductor at a very slow speed. B. The electric field moves through the conductor at nearly the speed of light. C. The current flow is proportional to the potential difference D. All of these are true

D. All of these are true

A device that is used to determine the presence and kind of electric charge of an object is: A. An electrostatic precipitator B. A dynamo C. A voltaic pile D. An electroscope

D. An electroscope

The scientist to propose the idea of positive and negative electrical charge was: A. Aristotle B. Robert J. Van de Graaf C. Michael Faraday D. Benjamin Franklin

D. Benjamin Franklin

The chief characteristics of a superconducting wire is: A. An extremely great length B. A large cross-sectional area C. An extremely high temperature D. No resistance

D. No resistance

The discovery that a current-carrying wire deflects a compass needle was made by: A. Franklin B. Faraday C. Henry D. Oersted

D. Oersted

How much power is consumed in toasting 2 slices of bread when the voltage (V) is 115 volts and the current (I) is 4.7 amperes? Which formula is used for this problem?

Joule's Law: P = V x I

What are some Insulators?

Wood, Plastic, Glass, Rubber, etc.