Deck 8: Chemical Bonding

Question 1

The unit of resistance is called a(n)

A) volt.
B) ampere.
C) coulomb.
D) ohm.
E) watt.

Answer 1

D

Question 2

A system of an electron and a neutron has a net charge of

A) +1.6 $\times$ 10^-19 C.
B) -1.6 $\times$ 10^-19 C.
C) 3.2 $\times$ 10^-19 C.
D) zero.

Answer 2

-1.6 $\times$ 10^-19 C.

Question 3

Ohm's law gives the relationship between

A) current and voltage.
B) work and current.
C) current and charge.
D) force and current.

Answer 3

A

Question 4

An object that is negatively charged will

A) attract a rubber rod stroked with fur.
B) attract a glass rod stroked with silk.
C) be polarized.
D) none of these

Question 5

A system of 8 electrons and 4 neutrons has a net charge of

A) -12.8 $\times$ 10^-19 C.
B) 12.8 $\times$ 10^-19 C.
C) -6.4 $\times$ 10^-19 C.
D) -8.0 $\times$ 10^-19 C.
E) 6.4 $\times$ 10^-19 C.

Question 6

A system of a proton and a neutron has a net charge of

A) +1.6 $\times$ 10^-19 C.
B) -1.6 $\times$ 10^-19 C.
C) 3.2 $\times$ 10^-19 C.
D) zero.

Question 7

A system of a proton and an electron has a net charge of

A) +1.6 $\times$ 10^-19 C.
B) -1.6 $\times$ 10^-19 C.
C) 3.2 $\times$ 10^-19 C.
D) zero.

Question 8

An object that is positively charged will

A) attract a rubber rod stroked with fur.
B) attract a glass rod stroked with silk.
C) be polarized.
D) none of these

Question 9

An object that is negatively charged will

A) repel a rubber rod stroked with fur.
B) repel a glass rod stroked with silk.
C) be polarized.
D) none of these

Question 10

A system of 11 protons and 9 neutrons has a net charge of

A) 17.6 $\times$ 10^-19 C.
B) -17.6 $\times$ 10^-19 C.
C) 32.0 $\times$ 10^-19 C.
D) 11.0 $\times$ 10^-19 C.
E) -32.0 $\times$ 10^-19 C.

Question 11

One ampere $\times$ one second is a unit of

A) power.
B) current.
C) voltage.
D) electric charge.
E) resistance.

Question 12

A system of 16 electrons, 11 protons, and 4 neutrons has a net charge of

A) -8.0 $\times$ 10^-19 C.
B) 8.0 $\times$ 10^-19 C.
C) -1.6 $\times$ 10^-19 C.
D) -5.0 $\times$ 10^-19 C.
E) 1.6 $\times$ 10^-19 C.

Question 13

A system of an electron, a proton, and a neutron has a net charge of

A) +1.6 $\times$ 10^-19 C.
B) -1.6 $\times$ 10^-19 C.
C) 3.2 $\times$ 10^-19 C.
D) zero.

Question 14

Electric charge is measured in units of

A) coulombs.
B) watts.
C) volts.
D) newtons.

Question 15

The abbreviation of the unit of resistance is

A)
B)
C)
D)
E)

Question 16

A system of 12 electrons and 11 protons has a net charge of

A) -1.6 $\times$ 10^-19 C.
B) 1.6 $\times$ 10^-19 C.
C) 16.0 $\times$ 10^-19 C.
D) -1.0 $\times$ 10^-19 C.
E) -16.0 $\times$ 10^-19 C.

Question 17

The unit for current is the

A) ampere.
B) ohm.
C) coulomb.
D) volt.

Question 18

The mathematical form of Coulomb's law is similar to that of

A) the second law of thermodynamics.
B) the second law of motion.
C) Kepler's second law.
D) the law of gravitation.

Question 19

An object that is positively charged will

A) repel a rubber rod stroked with fur.
B) repel a glass rod stroked with silk.
C) be polarized.
D) none of these

Question 20

In a conductor, what moves?

A) Electrons
B) Neutrons
C) Quarks
D) Protons

Question 21

Three resistors, 80 $\Omega$ , 40 $\Omega$ , and 60 $\Omega$ , are wired in series and connected to a 120-V battery. How much current flows in this circuit?

A) 0.67 A
B) 6.5 A
C) 2200 A
D) 0.00063 A

Question 22

If the voltage across a resistor is quadrupled, the current will

A) remain the same.
B) be cut to one-quarter.
C) be cut by one-quarter.
D) be quadrupled.
E) be multiplied by sixteen.

Question 23

If work is done on an electric charge, a ______________ is present.

A) resistance
B) current
C) voltage
D) transformer
E) bigger charge

Question 24

For electrical safety,

A) electrical shocks caused by 1 A of current are of no concern.
B) fuses or circuit breakers are wired in series in circuits.
C) fuses larger than the rated value can be placed in a circuit.
D) fuses and circuit breakers are wired in parallel in circuits.

Question 25

Three resistors, 40 $\Omega$ , 60 $\Omega$ , and 50 $\Omega$ , are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?

A) 150 $\Omega$
B) 16 $\Omega$
C) 0.062 $\Omega$
D) 120000 $\Omega$

Question 26

Which of the following would be the least conductive?

A) Copper
B) Salt water
C) Glass
D) Mercury

Question 27

Voltage is defined as the ______________ per unit ______________.

A) charge; current
B) work; current
C) charge; work
D) work; charge

Question 28

For an ohmic conductor, current is

A) directly proportional to voltage.
B) directly proportional to resistance.
C) independent of resistance.
D) independent of voltage.

Question 29

If the voltage across a resistor is doubled, the current will

A) remain the same.
B) be cut to one-fourth.
C) be cut in half.
D) be doubled.
E) be quadrupled.

Question 30

For an ohmic conductor, current is

A) inversely proportional to voltage.
B) inversely proportional to resistance.
C) independent of resistance.
D) independent of voltage.

Question 31

Three resistors, 60 $\Omega$ , 80 $\Omega$ , and 80 $\Omega$ , are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?

A) 220 $\Omega$
B) 24 $\Omega$
C) 0.042 $\Omega$
D) 384000 $\Omega$

Question 32

Three resistors, 10 $\Omega$ , 10 $\Omega$ , and 10 $\Omega$ , are wired in parallel and connected to a 120-V battery. How much current flows in this circuit?

A) 4 A
B) 36 A
C) 400 A
D) 0.12 A

Question 33

The source of magnetism is

A) polarization.
B) magnetic monopoles.
C) electrons.
D) protons.

Question 34

In a battery circuit with different resistors in parallel,

A) the total resistance is larger than the value of the largest resistor.
B) the current is the same through each resistor.
C) the total resistance is larger than the value of the smallest resistor.
D) the voltage is the same across each resistor.

Question 35

A component in an automobile 12-V electrical system has a resistance of 90 $\Omega$ . How much energy is dissipated by the component each second?

A) 0.63 J
B) 1.6 J
C) 7.5 J
D) 0.13 J

Question 36

The electric company charges a home on the basis of consumption of

A) resistance.
B) energy.
C) current.
D) voltage.
E) power.

Question 37

Magnetism results from

A) the movement of magnetic particles.
B) the movement of electric charge.
C) Earth's magnetic field.
D) the movement of magnetic charge.

Question 38

The electrical power dissipated in an appliance depends on

A) voltage.
B) current.
C) resistance.
D) all of these.

Question 39

The electrical power dissipated by a resistance R is

A) inversely proportional to I.
B) directly proportional to I².
C) directly proportional to I.
D) none of these.

Question 40

A component in an automobile 12-V electrical system has a resistance of 30 $\Omega$ . How much current is in the component when in operation?

A) 42 A
B) 0.4 A
C) 2.5 A
D) 360 A

Question 41

A motor converts

A) electricity into magnetism.
B) electrical energy into mechanical energy.
C) mechanical energy into electrical energy.
D) force into power.

Question 42

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing upward through it. What will happen to the wire?

A) The wire will be forced toward the north pole.
B) The wire will be forced perpendicular to the plane of the magnetic field, into the page.
C) The wire will be forced perpendicular to the plane of the magnetic field, out of the page.
D) The current will cease flowing.
E) The wire will be forced toward the south pole.

Question 43

A ferromagnetic material is magnetized by the alignment of

A) domains.
B) atoms.
C) single magnetic dipoles.
D) poles.

Question 44

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing through it. What will happen to the wire?

A) The wire will be forced toward the north pole.
B) The wire will be forced perpendicular to the plane of the magnetic field.
C) The current will cease flowing.
D) Nothing will happen.

Question 45

Consider a wire at rest in a magnetic field as shown in the following figure. What will happen to the wire?

A) A current will flow in the wire.
B) The wire will be pushed perpendicular to the plane of the magnetic field.
C) The wire will be pushed toward the north pole.
D) Nothing will happen.

Question 46

An insulator has a positive electric charge of 4 $\times$ 10 ^-17 C. How many electrons were added or removed?

A) 250 electrons removed
B) 40 electrons removed
C) 250 electrons added
D) 40 electrons added

Question 47

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing downward through it. What will happen to the wire?

A) The wire will be forced toward the north pole.
B) The wire will be forced perpendicular to the plane of the magnetic field, into the page.
C) The wire will be forced perpendicular to the plane of the magnetic field, out of the page.
D) The current will cease flowing.
E) The wire will be forced toward the south pole.

Question 48

An insulator has a negative electric charge of 2.4 $\times$ 10 ^-17 C. How many electrons were added or removed?

A) 150 electrons removed
B) 67 electrons removed
C) 150 electrons added
D) 67 electrons added

Question 49

The direction of the magnetic field of a bar magnet is

A) in the direction opposite to that in which a compass would point.
B) in any direction.
C) toward the south pole.
D) toward the north pole.

Question 50

An ac voltage can be increased or decreased easily using a

A) battery.
B) transformer.
C) fuse.
D) motor.
E) generator.

Question 51

A(n) ______________ is an elementary particle with no charge.

A) electron
B) neutron
C) proton
D) atom

Question 52

The angle between true north and the direction in which a compass needle points is called the angle of

A) attack.
B) inclination.
C) declination.
D) dip.

Question 53

The direction of the magnetic field of a bar magnet is

A) in the direction a compass would point.
B) in any direction.
C) away from the south pole.
D) toward the north pole.

Question 54

A(n) ______________ is an elementary particle with a charge of +1.6 $\times$ 10^-19 C.

A) electron
B) neutron
C) proton
D) atom

Question 55

A generator is a device that converts

A) heat energy into mechanical energy.
B) chemical energy into electrical energy.
C) mechanical energy into electrical energy.
D) electrical energy into mechanical energy.

Question 56

Earth's magnetic field

A) results from a huge bar magnet within the planet.
B) is believed to arise from currents within the planet's core.
C) is always parallel to the planet's surface.
D) is always in the same direction.

Question 57

A(n) ______________ is an elementary particle with a charge of -1.6 $\times$ 10^-19 C.

A) electron
B) neutron
C) proton
D) atom

Question 58

The direction of the magnetic field of a bar magnet is

A) in the direction opposite to that in which a compass would point.
B) in any direction.
C) away from the south pole.
D) away from the north pole.

Question 59

A ferromagnetic material loses this property above the ______________ temperature.

A) domain
B) Faraday
C) Curie
D) Coulomb

Question 60

A transformer with 400 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use. How many turns should be in the secondary coil?

A) 400 turns
B) 10000 turns
C) 16 turns
D) 3520 turns

Question 61

The unit of electric current is the _____________.

Question 62

A(n) ______________ is an elementary particle with a charge of +1.6 $\times$ 10^-19 coulomb.

Question 63

According to the law of charges, unlike charges _________.

Question 64

If a positively charged object is brought near a suspended, negatively charged object, the suspended object will be

A) repelled.
B) charged more.
C) discharged.
D) attracted.

Question 65

The resistances are added in a(n) ______________ circuit.

Question 66

Power may be expressed as _____________ times resistance.

Question 67

The expression V = IR is called ______________.

Question 68

The maximum current would flow in a set of resistors connected in ______________.

Question 69

Two oppositely charged particles ______________ one another.

Question 70

The rate of flow of electric charge is measured in units called ______________.

Question 71

Voltage has the units of _____________, which is called a volt.

Question 72

To prevent a home electric circuit from overheating because of too much current, a(n) ______________ is used.

Question 73

An object may be electrically neutral, but regions may be charged by _____________.

Question 74

If a negatively charged object is brought near a suspended, negatively charged object, the suspended object will be

A) repelled.
B) charged more.
C) discharged.
D) attracted.

Question 75

If a positively charged object is brought near a suspended, positively charged object, the suspended object will be

A) repelled.
B) charged more.
C) discharged.
D) attracted.

Question 76

Another name for electric potential difference is ______________.

Question 77

If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be

A) repelled.
B) charged more.
C) discharged.
D) attracted.

Question 78

In a(n) ______________, electrons do not move freely.

Question 79

The expression that mathematically describes the force between two static electric charges is called ______________.

Question 80

If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be ______________.