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Physics 2 week 2 test 1

Total questions: 90

Worksheet time: 45mins

Name
Class
Date
1.

The study of stationary electric charges is

a)

electromagnetism

b)

electrodynamics

c)

electronics

d)

electrostatics

2.

The study of electric charges in motion is

a)

electromagnetism

b)

electrodynamics

c)

electronics

d)

electrostatics

3.

Electricity is typically thought to be the same as

a)

electromagnetism

b)

electrodynamics

c)

electronics

d)

electrostatics

4.

The unit of measurement of electrical charges (SI) is

a)

Watt

b)

Joule

c)

Newton

d)

Coulomb

5.

One Coulomb is equal to the electrical charge of 6.25 × 10^18

a)

electrons

b)

protons

c)

neutrons

d)

nuclei

6.

A material that has a large number of free electrons is a:

a)

good insulator

b)

good conductor

c)

poor conductor

d)

All of these

7.

Which of the following is NOT a correct law of electrostatics:

a)

like charges repel

b)

unlike charges attract

c)

electric charges reside only on the internal surface of conductors

d)

all of these are laws of electrostatics

8.

As two charges get closer, the electrostatic force:

a)

is directly proportional to the amount of distance between them

b)

is inversely proportional to the amount of distance between them

c)

is inversely proportional to the square of the distance between them

d)

is directly proportional to the square of the distance between them

9.

If a conductor is curved, the greatest amount of charge will be found:

a)

at the beginning of the conductor

b)

at the end of the conductor

c)

at the area of the greatest curvature of the conductor

d)

along the straightest area of the conductor

10.

Rubbing a rubber rod with fur is an example of electrification by

a)

contact

b)

friction

c)

induction

11.

When there is movement of some of the electrons of an uncharged metallic object as it is brought into the electric field of a charged object, this is electrification by

a)

contact

b)

friction

c)

induction

12.

Electrification by induction requires that the two objects

a)

are in direct, constant contact with each other

b)

are not at all in contact with each other

c)

contact each other and then separate

d)

are as far apart as possible from each other

13.

To get electrons to flow along a conductor, there must be

a)

an excess of negative charges at one end of the wire

b)

an excess of negative charges at both ends of the wire

c)

an excess of positive charges at one end of the wire, and an excess of negative charges at the other

d)

an excess of positive charges at both ends of the wire

14.

The ability to do work because of a separation of charges is

a)

electric current

b)

electric potential

c)

resistance

15.

The flow of electrons along a conductor is

a)

electric current

b)

electric potential

c)

resistance

d)

electrostatics

16.

The property of a circuit that impedes the flow of electrons is

a)

electric current

b)

electric potential

c)

resistance

d)

electrostatics

17.

The volt is the unit of measure for

a)

electric current

b)

electric potential

c)

resistance

d)

electrostatics

18.

The ampere is the unit of measure for

a)

electric current

b)

electric potential

c)

resistance

d)

electrostatics

19.

A volt is the potential difference that will maintain a current of _____ ampere in a circuit with a resistance of ______ ohm.

a)

1; 2

b)

2; 1

c)

1; 1

d)

2; 2

20.

A volt is the ratio of work per unit of charge and is written

a)

Joules/Coulomb

b)

Coulomb/Joules

c)

Watt/Coulomb

d)

Coulomb/Watt

21.

A 12-volt battery use 12 Joules of energy to move

a)

1 Coulomb of charge

b)

2 Coulombs of charge

c)

12 Coulombs of charge

d)

24 Coulombs of charge

22.

Kilovoltage peak is abbreviated as

a)

kP

b)

kPk

c)

kVPk

d)

kVp

23.

The ampere is defined as ______ Coulomb passing by a point in ____ second.

a)

1; 1

b)

2; 1

c)

1; 2

d)

2; 2

24.

A material that allows electrons to move is a(n)

a)

volt

b)

insulator

c)

conductor

d)

inductor

25.

A material that resists the movement of electrons is a(n)

a)

ohm

b)

insulator

c)

conductor

d)

inductor

26.

Which of the following materials is a good conductor?

a)

Glass.

b)

Copper.

c)

Plastic.

d)

All of these are good conductors.

27.

Glass is an example of a(n)

a)

insulator

b)

conductor

c)

material that allows the flow of electrons

d)

inductor

28.

A battery produces

a)

alternating current

b)

indirect current

29.

Current that changes direction in the conductor is

a)

alternating current

b)

indirect current

c)

direct current

d)

weak current

30.

The 60 Hz of electricity flowing into homes in the U.S. characterizes

a)

alternating current

b)

indirect current

c)

direct current

d)

weak current

31.

A(n) ______ is the electrical resistance between two points along a conductor that, when one volt is applied, produces 1 ampere of current.

a)

amp

b)

volt

c)

ohm

d)

Watt

32.

Ohm’s law can be written as

a)

amps = volts ÷ ohms

b)

volts = amps × ohms

c)

ohms = volts ÷ amps

d)

none of these

33.

Ohm’s law can be written as

a)

I = V/R

b)

I = R/V

c)

R = I/V

d)

R = IR

34.

When a conductor is longer:

a)

resistance decreases

b)

resistance increases

c)

resistance remains the same

d)

none of these

35.

When a conductor has a smaller cross-sectional area:

a)

resistance decreases

b)

resistance increases

c)

resistance remains the same

d)

none of these

36.

When a metallic conductor is colder:

a)

resistance decreases

b)

resistance increases

c)

resistance remains the same

d)

none of these

37.

When a conductor is more twisted:

a)

resistance decreases

b)

resistance increases

38.

Which of the following is NOT a good electrical conductor?

a)

Gold.

b)

Copper.

c)

Glass.

d)

Water.

39.

Which of the following is NOT a good insulator?

a)

Glass.

b)

Gold.

c)

Wood.

d)

Ceramic.

40.

Rubber is

a)

an excellent conductor

b)

an excellent insulator

c)

a weak conductor

d)

a weak insulator

41.

A material that will conduct electricity, but not as well as good conductors, but also will insulate, but not as well as good insulators are called a(n)

a)

excellent conductor

b)

weak conductor

c)

weak insulator

d)

semiconductor

42.

A closed pathway of wires and related elements is a(n)

a)

diode

b)

fuse

c)

rheostat

d)

electric circuit

43.

When a switch is turned on, the electric circuit

a)

is closed

b)

does not allow electrons to flow

c)

is opened

d)

none of these

44.

A circuit with elements that are arranged like a —bridge| or branching across a conductor is called a

a)

series circuit

b)

parallel circuit

c)

bridge circuit

d)

series-parallel circuit

45.

A device that temporarily stores charge is the

a)

rheostat

b)

capacitor

c)

transformer

d)

fuse

46.

An adjustable form of a resistor is the

(a)  

47.

Which of the following does NOT open a circuit to keep the circuit and devices safe?

a)

Fuse.

b)

Resistor.

c)

Circuit breaker.

48.

Which of the following devices allow the electricity to flow in one direction only?

a)

Fuse

b)

Switch

c)

Transformer

d)

Diode

49.

The device that regulates the amount of current flowing in the circuit is the

a)

battery

b)

resistor

c)

fuse

d)

transformer

50.

The device that produces electrons through a chemical reaction is a

a)

transformer

b)

fuse

c)

resistor

d)

battery

51.

Which of the following devices can increase or decrease voltage by a set amount?

a)

Battery

b)

Capacitor

52.

The purpose of grounding is to

a)

provide a source for electricity

b)

neutralize a charged object

c)

replace the circuit breaker

d)

none of these

53.

The ability of a material to attract iron, cobalt, or nickel is called

a)

electromagnetism

b)

potential difference

c)

magnetism

d)

voltage

54.

The lines of force in space associated with a magnet are called

a)

lines of flux

b)

dipoles

c)

domains

d)

lines of field

55.

Inside the magnet, the lines of flux travel from

a)

north pole to south pole

b)

south pole to north pole

c)

east pole to west pole

d)

west pole to east pole

56.

56. Outside the magnet, the lines of flux travel from:

a)

north pole to south pole

b)

south pole to north pole

c)

center to the ends

d)

ends to the center

57.

Like poles of a magnet ________ each other and opposite poles ________ each other.

a)

a. attract; attract

b)

b. repel; repel

c)

c. attract; repel

d)

d. repel; attract

58.

The force of magnetic attraction varies

a)

directly with the square of the strength of the poles

b)

inversely with the square of the strength of the poles

c)

directly with the square of the distance between the poles

d)

inversely with the square of the distance between the poles

59.

Magnetic field strength is measured in

a)

tesla

b)

ohms

c)

Newtons

d)

Joules

60.

A material that is weakly repelled by a magnetic field is classified as

a)

nonmagnetic

b)

paramagnetic

c)

ferromagnetic

d)

diamagnetic

61.

A material that is strongly attracted to a magnetic field is

a)

nonmagnetic

b)

paramagnetic

c)

ferromagnetic

d)

diamagnetic

62.

A material that is weakly attracted to a magnetic field is

a)

nonmagnetic

b)

paramagnetic

c)

ferromagnetic

d)

diamagnetic

63.

Wood and plastic are considered:

a)

nonmagnetic

b)

paramagnetic

c)

ferromagnetic

d)

diamagnetic

64.

The idea that electricity flowing through a conductor produces a magnetic field was identified by

a)

Faraday

b)

Roentgen

c)

Tesla

d)

Oersted

65.

The idea that electricity could be induced in a wire by moving it through a magnetic field was discovered by

a)

Faraday

b)

Roentgen

c)

Tesla

d)

Oersted

66.

According to Faraday’s Law of Electromagnet Induction, if the strength of the magnetic field is increased, _________ is also increased.

a)

current

b)

resistance

c)

voltage

d)

all of these

67.

An electromagnet includes:

a)

a. a coil of wire

b)

b. an iron core

c)

c. a solenoid

d)

d. all of these

68.

Reducing the number of coils in the wire will result in

a)

increased electromagnetic induction

b)

reduced electromagnetic induction

c)

no effect on electromagnetic induction

69.

Increasing the strength of the magnetic field results in

a)

increased electromagnetic induction

b)

reduced electromagnetic induction

c)

no effect on electromagnetic induction

70.

Slowing down the speed at which the conductor passes through the magnetic field results in

a)

increased electromagnetic induction

b)

reduced electromagnetic induction

c)

no effect on electromagnetic induction

71.

Mutual induction involves electricity being induced into a ______________.

a)

Primary Coil

b)

secondary coil

c)

moving magnetic field

d)

mone of these

72.

With mutual induction, to induce voltage in the secondary coil, there must be

a)

a. a physical connection between the two coils of wire

b)

b. alternating current in the primary coil of wire

c)

c. direct current in the primary coil of wire

73.

_______________ current is induced in the secondary coil when mutual induction takes place

a)

alternating

b)

direct

c)

neither of the above

d)

both of the above

74.

With self-induction, the secondary current

a)

is in a secondary coil

b)

is in the original coil

c)

opposes the original current

d)

is in the original coil and opposes the original current

75.

Self-induction involves only one coil of wire and produces current that opposes the original.

a)

Ohm’s law

b)

Lenz’s law

c)

Oersted’s law

d)

Faraday’s law

76.

A device that converts mechanical energy to electrical energy is a

a)

motor

b)

transformer

c)

generator

d)

electromagnet

77.

Self-induction involves only one coil of wire and produces current that opposes the original.

a)

motor

b)

transformer

c)

generator

d)

electromagnet

78.

A step-up transformer results in

a)

increased current

b)

increased voltage

c)

increased resistance

79.

A step-down transformer results in

a)

increased current

b)

increased voltage

c)

increased resistance

80.

A step-up transformer results in

a)

decreased current

b)

decreased voltage

c)

decreased resistance

81.

A step-down transformer results in

a)

decreased current

b)

decreased voltage

c)

decreased resistance

82.

A transformer with 100 times more turns on the secondary side as compared with the primary

a)

is a step-up transformer

b)

is a step-down transformer

c)

is a transformer that works on self-induction

d)

will have 100 times the current on the secondary side

83.

Closed-core and shell-type transformers

a)

are seldom used in x-ray equipment

b)

are less efficient types of transformers

c)

are simpler types of transformers

d)

are more sophisticated and incorporate a ferromagnetic core

84.

The autotransformer

a)

uses self-induction

b)

uses two coils of wire

c)

does not use a magnetic core

d)

is not typically found in an x-ray machine

85.

The autotransformer is found on the

a)

primary circuit

b)

secondary circuit

c)

filament circuit

d)

none of these

86.

The mA meter is found on the

a)

primary circuit

b)

secondary circuit

c)

filament circuit

d)

none of these

87.

The main power switch is found on the

a)

primary circuit

b)

secondary circuit

c)

filament circuit

d)

none of these

88.

The x-ray tube (not filaments) is found on the

a)

primary circuit

b)

secondary circuit

c)

filament circuit

d)

none of these

89.

The rheostat is found on the

a)

primary circuit

b)

secondary circuit

c)

filament circuit

d)

none of these

90.

The primary side of the high-voltage transformer is found on the

a)

primary circuit

b)

secondary circuit

c)

filament circuit

d)

none of these

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