Question 1

A sustained electric current can be achieved with a

Accepted Answer

A) generator. 
B) battery. 
C) both 
D) none of the above 
A) generator. 
B) battery. 
C) both 
D) none of the above

Question 2

To say that electric charge is conserved means that no case has ever been found where

Accepted Answer

A) the net charge on an object has changed. 
B) the net amount of charge on an object has increased. 
C) net charge has been created or destroyed. 
D) none of the above 
A) the net charge on an object has changed. 
B) the net amount of charge on an object has increased. 
C) net charge has been created or destroyed. 
D) none of the above

Question 3

The current in a 10-ohm resistor is 5 A. What is the voltage across the resistor?

Accepted Answer

A) 5 V 
B) 10 V 
C) 15 V 
D) 20 V 
E) more than 20 V 
A) 5 V 
B) 10 V 
C) 15 V 
D) 20 V 
E) more than 20 V

Question 4

A pair of 60-W and 100-W incandescent lamps are intended for 120-V operation. Which lamp has a larger resistance?

Accepted Answer

A) 60-W lamp 
B) 100-W lamp 
C) both the same 
A) 60-W lamp 
B) 100-W lamp 
C) both the same

Question 5

The fundamental force underlying all chemical reactions is

Accepted Answer

A) gravitational. 
B) nuclear. 
C) centripetal. 
D) electrical. 
E) none of the above 
A) gravitational. 
B) nuclear. 
C) centripetal. 
D) electrical. 
E) none of the above

Question 6

The reason that Lillian's hair stands out when her hand is on a charged Van de Graaff generator is

Accepted Answer

A) strands of hair become charged and repel one another. 
B) a high voltage is communicated to strands of hair. 
C) strands of hair find themselves in an electric field. 
D) electrons and protons are deposited on her hair. 
A) strands of hair become charged and repel one another. 
B) a high voltage is communicated to strands of hair. 
C) strands of hair find themselves in an electric field. 
D) electrons and protons are deposited on her hair.

Question 7

A length of wire has resistance R. The same wire twice as long has resistance

Accepted Answer

A) R/2. 
B) R. 
C) 2R. 
D) none of the above 
A) R/2. 
B) R. 
C) 2R. 
D) none of the above

Question 8

Electric resistance is normally measured in

Accepted Answer

A) amperes. 
B) volts. 
C) newtons. 
D) joules. 
E) none of the above 
A) amperes. 
B) volts. 
C) newtons. 
D) joules. 
E) none of the above

Question 9

The electric force on a 2-C charge is 60 N. How great is the electric field at the charge location?

Accepted Answer

A) 20 N/C 
B) 30 N/C 
C) 60 N/C 
D) 120 N/C 
E) 240 N/C 
A) 20 N/C 
B) 30 N/C 
C) 60 N/C 
D) 120 N/C 
E) 240 N/C

Question 10

The amount of energy given to each coulomb of charge flowing through a 12-V battery is

Accepted Answer

A) 12 J. 
B) 12 A. 
C) 12 V. 
D) all of the above 
E) none of the above 
A) 12 J. 
B) 12 A. 
C) 12 V. 
D) all of the above 
E) none of the above

Question 11

When the distance between two charges is halved, the electric force between the charges

Accepted Answer

A) quadruples. 
B) doubles. 
C) is half. 
D) is reduced by one-quarter. 
E) none of the above 
A) quadruples. 
B) doubles. 
C) is half. 
D) is reduced by one-quarter. 
E) none of the above

Question 12

A water molecule is electrically

Accepted Answer

A) polarized. 
B) conducting. 
C) insulating. 
D) charged. 
A) polarized. 
B) conducting. 
C) insulating. 
D) charged.

Question 13

In a common dc circuit, electrons typically move at the speed of

Accepted Answer

A) a fraction of a centimeter per second. 
B) a few meters per second. 
C) sound. 
D) light. 
E) none of the above 
A) a fraction of a centimeter per second. 
B) a few meters per second. 
C) sound. 
D) light. 
E) none of the above

Question 14

The number of electrons delivered daily by power utilities to an average American home in a typical year in this century is

Accepted Answer

A) zero. 
B) 110. 
C) 220. 
D) billions of billions. 
E) none of the above 
A) zero. 
B) 110. 
C) 220. 
D) billions of billions. 
E) none of the above

Question 15

When a battery does 24 J of work on 10 C of charge, the voltage it supplies is

Accepted Answer

A) 2.4 V. 
B) 4.2 V. 
C) 24 V. 
D) 240 V. 
E) none of the above 
A) 2.4 V. 
B) 4.2 V. 
C) 24 V. 
D) 240 V. 
E) none of the above

Question 16

The purpose of a voltage source is to provide an electrical

Accepted Answer

A) energy sink. 
B) field. 
C) pressure. 
A) energy sink. 
B) field. 
C) pressure.

Question 17

The origin of the glow from the filament inside the ac incandescent lamp in your bedroom is

Accepted Answer

A) electrons resupplied by the wall outlet. 
B) electrons already in the filament. 
C) the positive charges that flow in the filament. 
D) resistance in the filament. 
A) electrons resupplied by the wall outlet. 
B) electrons already in the filament. 
C) the positive charges that flow in the filament. 
D) resistance in the filament.

Question 18

The electric force between charges is strongest when the charges are

Accepted Answer

A) close together. 
B) far apart. 
C) either 
A) close together. 
B) far apart. 
C) either

Question 19

A pair of positively-charged plastic straws tend to

Accepted Answer

A) attract each other. 
B) repel each other. 
C) neutralize each other. 
A) attract each other. 
B) repel each other. 
C) neutralize each other.

Question 20

Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will draw

Accepted Answer

A) more current. 
B) less current. 
C) the same current. 
A) more current. 
B) less current. 
C) the same current.

Exam 8: Static and Current Electricity

A sustained electric current can be achieved with a

To say that electric charge is conserved means that no case has ever been found where

The current in a 10-ohm resistor is 5 A. What is the voltage across the resistor?

A pair of 60-W and 100-W incandescent lamps are intended for 120-V operation. Which lamp has a larger resistance?

The fundamental force underlying all chemical reactions is

The reason that Lillian's hair stands out when her hand is on a charged Van de Graaff generator is

A length of wire has resistance R. The same wire twice as long has resistance

Electric resistance is normally measured in

The electric force on a 2-C charge is 60 N. How great is the electric field at the charge location?

The amount of energy given to each coulomb of charge flowing through a 12-V battery is

When the distance between two charges is halved, the electric force between the charges

A water molecule is electrically

In a common dc circuit, electrons typically move at the speed of

The number of electrons delivered daily by power utilities to an average American home in a typical year in this century is

When a battery does 24 J of work on 10 C of charge, the voltage it supplies is

The purpose of a voltage source is to provide an electrical

The origin of the glow from the filament inside the ac incandescent lamp in your bedroom is

The electric force between charges is strongest when the charges are

A pair of positively-charged plastic straws tend to

Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will draw

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

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