Question 1

The electric energy stored in a 3-V battery whose capacity is 2 Ah is

Accepted Answer

A) 6 J. 
B) 360 J. 
C) 600 J. 
D) 21.6 kJ. 
A) 6 J. 
B) 360 J. 
C) 600 J. 
D) 21.6 kJ.

Question 2

In a drawing of magnetic field lines, the weaker the field is, the

Accepted Answer

A) closer together the field lines are. 
B) farther apart the field lines are. 
C) more nearly parallel the field lines are. 
D) more divergent the field lines are. 
A) closer together the field lines are. 
B) farther apart the field lines are. 
C) more nearly parallel the field lines are. 
D) more divergent the field lines are.

Question 3

A current-carrying loop in a magnetic field always tends to turn until the plane of the loop is

Accepted Answer

A) parallel to the field. 
B) perpendicular to the field. 
C) either parallel or perpendicular, depending on the direction of the current. 
D) at a 45-degree angle with the field. 
A) parallel to the field. 
B) perpendicular to the field. 
C) either parallel or perpendicular, depending on the direction of the current. 
D) at a 45-degree angle with the field.

Question 4

At different places on the earth's surface, the earth's magnetic field

Accepted Answer

A) is the same in direction and magnitude. 
B) may be different in direction but not in magnitude. 
C) may be different in magnitude but not in direction. 
D) may be different in both magnitude and direction. 
A) is the same in direction and magnitude. 
B) may be different in direction but not in magnitude. 
C) may be different in magnitude but not in direction. 
D) may be different in both magnitude and direction.

Question 5

The conventional unit of battery capacity is the ampere-hour, which is actually a unit of

Accepted Answer

A) energy. 
B) power. 
C) potential difference. 
D) electric charge. 
A) energy. 
B) power. 
C) potential difference. 
D) electric charge.

Question 6

The watt, the unit of power, is equal to the

Accepted Answer

A) (volt)(ampere). 
B) volt/ampere. 
C) ampere/volt. 
D) (volt)(ohm). 
A) (volt)(ampere). 
B) volt/ampere. 
C) ampere/volt. 
D) (volt)(ohm).

Question 7

When a magnetized iron bar is strongly heated, its magnetic field

Accepted Answer

A) becomes weaker. 
B) becomes stronger. 
C) reverses its direction. 
D) is unchanged. 
A) becomes weaker. 
B) becomes stronger. 
C) reverses its direction. 
D) is unchanged.

Question 8

The volt is the unit of electric

Accepted Answer

A) current. 
B) potential difference. 
C) potential energy. 
D) resistance. 
A) current. 
B) potential difference. 
C) potential energy. 
D) resistance.

Question 9

An object has a positive electric charge whenever

Accepted Answer

A) it has an excess of electrons. 
B) it has a deficiency of electrons. 
C) the nuclei of its atoms are positively charged. 
D) the electrons of its atoms are positively charged. 
A) it has an excess of electrons. 
B) it has a deficiency of electrons. 
C) the nuclei of its atoms are positively charged. 
D) the electrons of its atoms are positively charged.

Question 10

A compass needle tends to

Accepted Answer

A) line up perpendicular to a magnetic field. 
B) line up parallel to a magnetic field. 
C) turn slowly in a constant magnetic field. 
D) point only toward the North Pole. 
A) line up perpendicular to a magnetic field. 
B) line up parallel to a magnetic field. 
C) turn slowly in a constant magnetic field. 
D) point only toward the North Pole.

Question 11

A current is flowing south along a power line.Neglecting the earth's field, the direction of the magnetic field under the power line is

Accepted Answer

A) north. 
B) south. 
C) east. 
D) west. 
A) north. 
B) south. 
C) east. 
D) west.

Question 12

The charge on an electron

Accepted Answer

A) is l C. 
B) depends on the electron's mass. 
C) depends on the electron's size. 
D) is always the same. 
A) is l C. 
B) depends on the electron's mass. 
C) depends on the electron's size. 
D) is always the same.

Question 13

Relative to the electric force between two protons, the gravitational force between them is

Accepted Answer

A) weaker. 
B) equal in magnitude. 
C) stronger. 
D) Any of these choices could be correct, depending on how far apart the protons are. 
A) weaker. 
B) equal in magnitude. 
C) stronger. 
D) Any of these choices could be correct, depending on how far apart the protons are.

Question 14

Superconductivity occurs in certain substances

Accepted Answer

A) only at very low temperatures. 
B) only at very high temperatures. 
C) at all temperatures. 
D) only when they are in the liquid state. 
A) only at very low temperatures. 
B) only at very high temperatures. 
C) at all temperatures. 
D) only when they are in the liquid state.

Question 15

The primary coil of a transformer has 200 turns and its secondary coil has 40 turns. If the current in the secondary coil is 25 A, the current in the primary coil is

Accepted Answer

A)  5 A. 
B)  6.4 A. 
C)  2.5 A. 
D)  125 A. 
A)  5 A. 
B)  6.4 A. 
C)  2.5 A. 
D)  125 A.

Question 16

The particle easiest to remove from an atom is a(an)

Accepted Answer

A) electron. 
B) proton. 
C) neutron. 
D) nucleus. 
A) electron. 
B) proton. 
C) neutron. 
D) nucleus.

Question 17

Two charges of +Q are 1 cm apart.If one of the charges is replaced by a charge of -Q, the magnitude of the force between them is

Accepted Answer

A) zero. 
B) smaller. 
C) the same. 
D) larger. 
A) zero. 
B) smaller. 
C) the same. 
D) larger.

Question 18

When a rubber rod is stroked with a piece of fur,

Accepted Answer

A) the rod becomes negatively charged while the fur remains neutral. 
B) both the rod and fur become negatively charged. 
C) the rod becomes negatively charged and the fur becomes positively charged. 
D) Any of these choices could be correct, depending on how hard the rod is stroked. 
A) the rod becomes negatively charged while the fur remains neutral. 
B) both the rod and fur become negatively charged. 
C) the rod becomes negatively charged and the fur becomes positively charged. 
D) Any of these choices could be correct, depending on how hard the rod is stroked.

Question 19

Which of the following is not a basic physical law or phenomenon but applies only to certain materials?

Accepted Answer

A) Coulomb's law 
B) Ohm's law 
C) the motor effect 
D) electromagnetic induction 
A) Coulomb's law 
B) Ohm's law 
C) the motor effect 
D) electromagnetic induction

Question 20

An electric iron draws a current of 15 A when connected to a 120-V power source.Its resistance is

Accepted Answer

A) 0.125 ohms. 
B) 8 ohms. 
C) 16 ohms. 
D) 1800 ohms. 
A) 0.125 ohms. 
B) 8 ohms. 
C) 16 ohms. 
D) 1800 ohms.

The electric energy stored in a 3-V battery whose capacity is 2 Ah is

In a drawing of magnetic field lines, the weaker the field is, the

A current-carrying loop in a magnetic field always tends to turn until the plane of the loop is

At different places on the earth's surface, the earth's magnetic field

The conventional unit of battery capacity is the ampere-hour, which is actually a unit of

The watt, the unit of power, is equal to the

When a magnetized iron bar is strongly heated, its magnetic field

The volt is the unit of electric

An object has a positive electric charge whenever

A compass needle tends to

A current is flowing south along a power line.Neglecting the earth's field, the direction of the magnetic field under the power line is

The charge on an electron

Relative to the electric force between two protons, the gravitational force between them is

Superconductivity occurs in certain substances

The primary coil of a transformer has 200 turns and its secondary coil has 40 turns. If the current in the secondary coil is 25 A, the current in the primary coil is

The particle easiest to remove from an atom is a(an)

Two charges of +Q are 1 cm apart.If one of the charges is replaced by a charge of -Q, the magnitude of the force between them is

When a rubber rod is stroked with a piece of fur,

Which of the following is not a basic physical law or phenomenon but applies only to certain materials?

An electric iron draws a current of 15 A when connected to a 120-V power source.Its resistance is

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Exam 6: Electricity and Magnetism

The electric energy stored in a 3-V battery whose capacity is 2 Ah is

In a drawing of magnetic field lines, the weaker the field is, the

A current-carrying loop in a magnetic field always tends to turn until the plane of the loop is

At different places on the earth's surface, the earth's magnetic field

The conventional unit of battery capacity is the ampere-hour, which is actually a unit of

The watt, the unit of power, is equal to the

When a magnetized iron bar is strongly heated, its magnetic field

The volt is the unit of electric

An object has a positive electric charge whenever

A compass needle tends to

A current is flowing south along a power line.Neglecting the earth's field, the direction of the magnetic field under the power line is

The charge on an electron

Relative to the electric force between two protons, the gravitational force between them is

Superconductivity occurs in certain substances

The primary coil of a transformer has 200 turns and its secondary coil has 40 turns. If the current in the secondary coil is 25 A, the current in the primary coil is

The particle easiest to remove from an atom is a(an)

Two charges of +Q are 1 cm apart.If one of the charges is replaced by a charge of -Q, the magnitude of the force between them is

When a rubber rod is stroked with a piece of fur,

Which of the following is not a basic physical law or phenomenon but applies only to certain materials?

An electric iron draws a current of 15 A when connected to a 120-V power source.Its resistance 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