Question 1

Which of the following statements is not true?

Accepted Answer

A) Protons are positively charged. 
B) The proton mass is greater than the electron mass. 
C) The proton mass is almost the same as the neutron mass. 
D) A proton in an atom circulates around its nucleus. 
A) Protons are positively charged. 
B) The proton mass is greater than the electron mass. 
C) The proton mass is almost the same as the neutron mass. 
D) A proton in an atom circulates around its nucleus. D

Question 2

A magnet attracts

Accepted Answer

A) all substances. 
B) only iron and iron alloys and repels nothing. 
C) iron and iron alloys and repels other substances. 
D) some substances and repels others. 
A) all substances. 
B) only iron and iron alloys and repels nothing. 
C) iron and iron alloys and repels other substances. 
D) some substances and repels others. D

Question 3

A magnetic field does not interact with a

Accepted Answer

A) stationary electric charge. 
B) moving electric charge. 
C) stationary magnet. 
D) moving magnet. 
A) stationary electric charge. 
B) moving electric charge. 
C) stationary magnet. 
D) moving magnet. A

Question 4

Two 240-watt light bulbs are connected in parallel across a 120-V power line. The current in each bulb is

Accepted Answer

A)  0.5 A. 
B)  1.0 A. 
C)  2.0 A. 
D)  4.0 A. 
A)  0.5 A. 
B)  1.0 A. 
C)  2.0 A. 
D)  4.0 A.

Question 5

What is the resistance in a 60-W, 12-V light bulb?

Accepted Answer

A) 0.2 ohms 
B) 0.42 ohms 
C) 2.4 ohms 
D) 5 ohms 
A) 0.2 ohms 
B) 0.42 ohms 
C) 2.4 ohms 
D) 5 ohms

Question 6

Direct electric current cannot be used to operate

Accepted Answer

A) electric motors. 
B) electric heaters. 
C) electromagnets. 
D) transformers. 
A) electric motors. 
B) electric heaters. 
C) electromagnets. 
D) transformers.

Question 7

Three 12-V batteries cannot be connected to give a voltage for the set of

Accepted Answer

A) 6 V. 
B) 12 V. 
C) 24 V. 
D) 36 V. 
A) 6 V. 
B) 12 V. 
C) 24 V. 
D) 36 V.

Question 8

The current with which a transformer is used

Accepted Answer

A) must be dc. 
B) must be ac. 
C) may be either dc or ac. 
D) may be neither dc nor ac. 
A) must be dc. 
B) must be ac. 
C) may be either dc or ac. 
D) may be neither dc nor ac.

Question 9

Superconductors

Accepted Answer

A) have no electrical resistance. 
B) have very little electrical resistance. 
C) are used in making transistors. 
D) have no practical applications. 
A) have no electrical resistance. 
B) have very little electrical resistance. 
C) are used in making transistors. 
D) have no practical applications.

Question 10

A positive electric charge

Accepted Answer

A) attracts other positive charges. 
B) repels other positive charges. 
C) does not interact with other positive charges but only with negative ones. 
D) consists of an excess of electrons. 
A) attracts other positive charges. 
B) repels other positive charges. 
C) does not interact with other positive charges but only with negative ones. 
D) consists of an excess of electrons.

Question 11

The current in a 20-ohm electric heater operated at 240 V is

Accepted Answer

A)  0.083 A. 
B)  12 A. 
C)  2880 A. 
D)  4800 A. 
A)  0.083 A. 
B)  12 A. 
C)  2880 A. 
D)  4800 A.

Question 12

The primary coil of a transformer is connected to a source of alternating current of voltage V.The voltage of the secondary current is

Accepted Answer

A) lower than V. 
B) equal to V. 
C) higher than V. 
D) Any of these choices could be correct, depending on the ratio of turns in the transformer coils. 
A) lower than V. 
B) equal to V. 
C) higher than V. 
D) Any of these choices could be correct, depending on the ratio of turns in the transformer coils.

Question 13

A current-carrying wire is in a magnetic field with the direction of the current parallel to that of the field.

Accepted Answer

A) The wire tends to move parallel to the field. 
B) The wire tends to move perpendicular to the field. 
C) The wire tends to turn until it is parallel to the field. 
D) The wire has no tendency to move or to turn. 
A) The wire tends to move parallel to the field. 
B) The wire tends to move perpendicular to the field. 
C) The wire tends to turn until it is parallel to the field. 
D) The wire has no tendency to move or to turn.

Question 14

When a current passes through a resistance, the electric energy that is lost

Accepted Answer

A) becomes heat. 
B) becomes magnetic energy. 
C) is returned to the source of the current. 
D) disappears. 
A) becomes heat. 
B) becomes magnetic energy. 
C) is returned to the source of the current. 
D) disappears.

Question 15

A current-carrying wire is in a magnetic field with the direction of the current perpendicular to that of the field.

Accepted Answer

A) The wire tends to move parallel to the field. 
B) The wire tends to move perpendicular to the field. 
C) The wire tends to turn until it is perpendicular to the field. 
D) The wire has no tendency to move or to turn. 
A) The wire tends to move parallel to the field. 
B) The wire tends to move perpendicular to the field. 
C) The wire tends to turn until it is perpendicular to the field. 
D) The wire has no tendency to move or to turn.

Question 16

The current in a 24-W, 12-V light bulb is

Accepted Answer

A)  0.5 A. 
B)  2 A. 
C)  12 A. 
D)  288 A. 
A)  0.5 A. 
B)  2 A. 
C)  12 A. 
D)  288 A.

Question 17

A solid conductor is one

Accepted Answer

A) whose electrons are firmly bound in place. 
B) whose electrons are free to move about. 
C) that has no electrons. 
D) that has too many electrons. 
A) whose electrons are firmly bound in place. 
B) whose electrons are free to move about. 
C) that has no electrons. 
D) that has too many electrons.

Question 18

Protons and electrons have different masses.When they are the same distance apart, the electric force between two electrons

Accepted Answer

A) is less than the force between two protons. 
B) is the same as the force between two protons. 
C) is greater than the force between two protons. 
D) Any of these choices could be correct, depending on the distance between each pair of particles. 
A) is less than the force between two protons. 
B) is the same as the force between two protons. 
C) is greater than the force between two protons. 
D) Any of these choices could be correct, depending on the distance between each pair of particles.

Question 19

The power rating of an electric motor that draws a current of 3 A when operated at 240 V is

Accepted Answer

A) 80 W. 
B) 720 W. 
C) 1080 W. 
D) 2160 W. 
A) 80 W. 
B) 720 W. 
C) 1080 W. 
D) 2160 W.

Question 20

The primary coil of a transformer has 200 turns and its secondary coil has 50 turns, and the current in the secondary coil is 40 A.If the power input of the transformer is 60 W, its power output is

Accepted Answer

A) 20 W. 
B) 60 W. 
C) 180 W. 
D) 540 W. 
A) 20 W. 
B) 60 W. 
C) 180 W. 
D) 540 W.

Which of the following statements is not true?

A magnet attracts

A magnetic field does not interact with a

Two 240-watt light bulbs are connected in parallel across a 120-V power line. The current in each bulb is

What is the resistance in a 60-W, 12-V light bulb?

Direct electric current cannot be used to operate

Three 12-V batteries cannot be connected to give a voltage for the set of

The current with which a transformer is used

Superconductors

A positive electric charge

The current in a 20-ohm electric heater operated at 240 V is

The primary coil of a transformer is connected to a source of alternating current of voltage V.The voltage of the secondary current is

A current-carrying wire is in a magnetic field with the direction of the current parallel to that of the field.

When a current passes through a resistance, the electric energy that is lost

A current-carrying wire is in a magnetic field with the direction of the current perpendicular to that of the field.

The current in a 24-W, 12-V light bulb is

A solid conductor is one

Protons and electrons have different masses.When they are the same distance apart, the electric force between two electrons

The power rating of an electric motor that draws a current of 3 A when operated at 240 V is

The primary coil of a transformer has 200 turns and its secondary coil has 50 turns, and the current in the secondary coil is 40 A.If the power input of the transformer is 60 W, its power output is

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Exam 6: Electricity and Magnetism

Which of the following statements is not true?

A magnet attracts

A magnetic field does not interact with a

Two 240-watt light bulbs are connected in parallel across a 120-V power line. The current in each bulb is

What is the resistance in a 60-W, 12-V light bulb?

Direct electric current cannot be used to operate

Three 12-V batteries cannot be connected to give a voltage for the set of

The current with which a transformer is used

Superconductors

A positive electric charge

The current in a 20-ohm electric heater operated at 240 V is

The primary coil of a transformer is connected to a source of alternating current of voltage V.The voltage of the secondary current is

A current-carrying wire is in a magnetic field with the direction of the current parallel to that of the field.

When a current passes through a resistance, the electric energy that is lost

A current-carrying wire is in a magnetic field with the direction of the current perpendicular to that of the field.

The current in a 24-W, 12-V light bulb is

A solid conductor is one

Protons and electrons have different masses.When they are the same distance apart, the electric force between two electrons

The power rating of an electric motor that draws a current of 3 A when operated at 240 V is

The primary coil of a transformer has 200 turns and its secondary coil has 50 turns, and the current in the secondary coil is 40 A.If the power input of the transformer is 60 W, its power output is

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

Universe

Filters