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Worksheets

4 Electricity Q2 Revision

Total questions: 130

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

Is steel a .....

a)

Conductor

b)

Insulator

2.

Mercury is a .....

a)

Conductor

b)

Insulator

3.

Plastic is a .....

a)

Conductor

b)

Insulator

4.

Diamond is a .....

a)

Conductor

b)

Insulator

5.

Graphite is a .....

a)

Conductor

b)

Insulator

6.

How can we test if a material is a conductor? Choose the best method.

a)

Build a simple circuit with a battery, a bulb, and the material; if the bulb lights, the material is a conductor.

b)

Measure the material’s mass; if it is heavy, it is a conductor.

c)

Heat the material strongly; if it melts, it is a conductor.

d)

Check the material’s color; if it looks shiny, it is a conductor.

7.

Electric charge can be either positive or negative. In an atom, an electron has a negative charge that is the same size as the positive charge of a proton. Which statement best describes the relative charges of electrons and protons in an atom?

a)

They have equal magnitude but opposite signs

b)

They have equal magnitude and the same sign

c)

The electron’s charge is larger in magnitude than the proton’s

d)

Both have no net charge

8.

What is the charge on a neutron?

a)

Positive

b)

Negative

c)

Zero

d)

Depends on the atom

9.

As an atom has the same number of electrons as protons it is uncharged. What is the overall charge of such an atom?

a)

Positive

b)

Negative

c)

Zero

d)

Depends on the number of neutrons

10.

Static electricity describes the situation when electric charges remain stationary and occurs best with insulators. Which option correctly identifies the conditions for static electricity?

a)

Charges are stationary; best with insulators

b)

Charges are moving; best with insulators

c)

Charges are stationary; best with conductors

d)

Charges are moving; best with conductors

11.

Which statement is correct about electric current?

a)

It is stationary charge and occurs best with insulators

b)

It is moving charge and occurs best with conductors

c)

It is stationary charge and occurs best with conductors

d)

It is moving charge and occurs best with insulators

12.

When certain insulating materials are rubbed against each other they become electrically charged as electrons are rubbed off one material onto the other. According to this, which material becomes negatively charged?

a)

The material that loses electrons

b)

The material that gains electrons

c)

Both materials become negative

d)

Neither material becomes negative

13.

When insulating materials are rubbed together, the material that loses electrons is left with an equal positive charge. Which statement identifies the positively charged material?

a)

The material that gains electrons

b)

The material that loses electrons

c)

Both materials are positive

d)

The cloth only becomes positive regardless of electron transfer

14.

Which statement matches the law of charges?

a)

Like charges attract; unlike repel

b)

Like charges repel; unlike attract

c)

Neutral and positive always repel

d)

Neutral and negative always attract

15.

The instrument shown is used to detect electric charge. What is the name of the device illustrated?

a)

Gold-leaf electroscope

b)

Voltmeter

c)

Ammeter

d)

Thermistor probe

16.

In electric field diagrams for a positive charge, field lines point away from the charge. For a single isolated positive charge, what is the direction of the electric field lines?

a)

Radially outward from the charge

b)

Radially inward toward the charge

c)

Circular around the charge

d)

Random, without a defined direction

17.

Between two parallel plates with the left plate negative and the right plate positive, what is the direction of the uniform electric field?

a)

From the negative plate to the positive plate

b)

From the positive plate to the negative plate

c)

Upward from bottom to top plate

d)

There is no electric field between parallel plates

18.

Show understanding that a current is a rate of flow of charge and recall the equation. Which equation defines electric current?

a)

I=Q/tI = Q/t

b)

I=V/RI = V/R

c)

I=P/VI = P/V

d)

I=F/qI = F/q

19.

Distinguish between the direction of flow of electrons and conventional current. Compared to electron flow in a metal conductor, conventional current is in which direction?

a)

The same direction as electron flow

b)

Opposite to the direction of electron flow

c)

Perpendicular to the direction of electron flow

d)

Conventional current does not have a defined direction

20.

Keywords include the unit of current. What is the SI unit of electric current?

a)

Volt

b)

Ohm

c)

Ampere

d)

Coulomb

21.

Define electric current.

a)

Charge passing a point per unit time

b)

Energy used per electron per unit length

c)

Number of atoms in a conductor per unit volume

d)

Rate of temperature increase in a wire

22.

Which equation correctly relates current, charge and time?

a)

I=QtI=\dfrac{Q}{t}

b)

I=QtI=Qt

c)

Q=ItQ=\dfrac{I}{t}

d)

t=IQt=IQ

23.

Which statement about directions is correct for conventional current and electron flow in a circuit?

a)

Conventional current is from positive to negative, while free electrons flow from negative to positive

b)

Conventional current and free electrons both flow from negative to positive

c)

Conventional current is from negative to positive, while free electrons flow from positive to negative

d)

Both conventional current and free electrons flow from positive to negative

24.

In metals, electrical conduction is described in terms of the movement of which particles?

a)

Free electrons

b)

Protons

c)

Neutral atoms

d)

Positive ions

25.

Which description correctly distinguishes direct current (d.c.) from alternating current (a.c.)?

a)

d.c. flows in one constant direction; a.c. repeatedly reverses direction

b)

d.c. repeatedly reverses direction; a.c. flows in one constant direction

c)

Both d.c. and a.c. flow in one constant direction

d)

Both d.c. and a.c. repeatedly reverse direction

26.

Electricity is the movement of what around a circuit?

a)

Charge

b)

Heat

c)

Light

d)

Mass

27.

Which statement about materials is correct?

a)

Good conductors allow electrons to move through them easily; insulators do not allow electrons to move easily

b)

Good conductors prevent electrons from moving; insulators allow electrons to move easily

c)

Both conductors and insulators allow electrons to move equally easily

d)

Neither conductors nor insulators allow electrons to move at all

28.

A current of 1 A corresponds to what amount of charge transferred in 1 s?

a)

1 C1\,\text{C}

b)

0.1 C0.1\,\text{C}

c)

10 C10\,\text{C}

d)

1 A1\,\text{A}

29.

Using Q=ItQ=It , how much charge is transferred when a current of 2 A2\,\text{A} flows for 5 s5\,\text{s} ?

a)

10 C10\,\text{C}

b)

7 C7\,\text{C}

c)

2.5 C2.5\,\text{C}

d)

1 C1\,\text{C}

30.

Using t=QIt=\dfrac{Q}{I} , how long does it take for 12 C12\,\text{C} of charge to pass a point in a circuit if the current is 3 A3\,\text{A} ?

a)

4 s4\,\text{s}

b)

0.25 s0.25\,\text{s}

c)

3 s3\,\text{s}

d)

9 s9\,\text{s}

31.

Based on the diagram showing arrows that indicate the direction of electron movement around a cell, which statement is supported by the diagram?

a)

Free electrons move from the negative terminal to the positive terminal

b)

Free electrons move from the positive terminal to the negative terminal

c)

Electrons remain stationary while charge moves

d)

Conventional current and electron flow are in the same direction

32.

Name that component: The symbol is a circle with the letter A inside, connected in series in a circuit.

a)

Ammeter

b)

Voltmeter

c)

Lamp

d)

Switch

33.

Name that component: The symbol is a circle with the letter V inside, connected across a component.

a)

Voltmeter

b)

Ammeter

c)

Cell

d)

Fuse

34.

Name that component: The symbol shows one long line and one short line representing a single source.

a)

Cell

b)

Battery

c)

Resistor

d)

Variable resistor

35.

Name that component: The symbol shows multiple pairs of long and short lines indicating several sources in series.

a)

Battery

b)

Cell

c)

Fuse

d)

Lamp

36.

Name that component: The symbol is a circle with an X (filament) inside.

a)

Lamp

b)

Resistor

c)

Switch

d)

Ammeter

37.

Name that component: The symbol is a rectangle placed in a conductor line.

a)

Resistor

b)

Fuse

c)

Switch

d)

Voltmeter

38.

Name that component: The symbol is a straight line with a small rectangle (or gap with a block) indicating a protective element.

a)

Fuse

b)

Cell

c)

Battery

d)

Ammeter

39.

Name that component: The symbol is a rectangle with a diagonal arrow across it.

a)

Variable resistor

b)

Resistor

c)

Lamp

d)

Voltmeter

40.

Name that component: The symbol shows a break in a conductor with a pivoted lever in the open position.

a)

Switch

b)

Fuse

c)

Ammeter

d)

Cell

41.

Which description matches Direct Current (DC)?

a)

The direction of the current or voltage is always constant over time.

b)

The direction of the current switches periodically and the voltage also switches.

c)

The voltage oscillates while the current remains zero.

d)

The current increases linearly with time without changing direction.

42.

Which plot represents Alternating Current (AC) voltage over time?

a)

A sinusoidal wave crossing the time axis periodically

b)

A horizontal line above the time axis

c)

A vertical line at t = 0

d)

A parabolic curve opening upward

43.

Which statement about Alternating Current (AC) is correct?

a)

The direction of the current is switched periodically, and the voltage is also switched.

b)

The direction of the current is always constant, and the voltage never changes.

c)

The current and voltage are both zero at all times.

d)

The voltage increases stepwise while the current remains constant.

44.

What is the energy change which takes place in a battery?

a)

Chemical energy to electrical energy

b)

Electrical energy to chemical energy

c)

Thermal energy to electrical energy

d)

Mechanical energy to electrical energy

45.

What is potential difference?

a)

The work done to drive a unit charge through a component in a circuit

b)

The work done to drive any amount of charge around a complete circuit

c)

The rate of flow of charge through a conductor

d)

The resistance a component offers to current flow

46.

What is e.m.f. (electromotive force) of a cell or power source?

a)

The work done per unit charge by the source in driving charge around a complete circuit

b)

The work done per unit charge across a single component

c)

The force experienced by a charge in a magnetic field

d)

The power dissipated per unit charge in a resistor

47.

Which statement best describes resistance as a property of a conductor that resists the flow of electrical current, where good conductors have little resistance and poor conductors have lots of resistance?

a)

Resistance is the ability of a material to store charge.

b)

Resistance is the opposition a conductor offers to current flow.

c)

Resistance is the rate at which a charge moves through a circuit.

d)

Resistance is the total amount of energy supplied by a battery.

48.

In physics, the unit used to measure resistance is which of the following?

a)

ampere

b)

volt

c)

ohm

d)

coulomb

49.

How does the resistance of a wire vary with its dimensions according to the lesson outline: long wires have more resistance than short wires, and thin wires have more resistance than thick wires?

a)

Resistance decreases with length and increases with thickness.

b)

Resistance increases with length and decreases with thickness.

c)

Resistance decreases with both length and thickness.

d)

Resistance increases with both length and thickness.

50.

Which expression is the equation for resistance stated in the course takeaway?

a)

R=VIR=\dfrac{V}{I}

b)

R=VIR=VI

c)

R=IVR=\dfrac{I}{V}

d)

R=V+IR=V+I

51.

Qualitatively, for a metallic electrical conductor, which relationship is correct according to the takeaway: resistance is directly proportional to length and inversely proportional to cross-sectional area?

a)

Resistance decreases as length increases and increases as cross-sectional area increases.

b)

Resistance increases as length increases and increases as cross-sectional area increases.

c)

Resistance increases as length increases and decreases as cross-sectional area increases.

d)

Resistance is independent of both length and cross-sectional area.

52.

Based on the diagram comparing a thin wire (not much space, high resistance) and a thick wire (more space, low resistance), which wire has the higher resistance and why?

a)

The thin wire, because there is less space for electrons to pass through.

b)

The thick wire, because it contains more metal ions to collide with.

c)

Both wires have the same resistance if made of the same material and length.

d)

The thick wire, because its cross-sectional area increases current density.

53.

According to the explanation of electron collisions in a conductor, which statement correctly compares the resistance of long and short wires of the same material and thickness?

a)

A long wire has less resistance because electrons have more room to spread out.

b)

A long wire has greater resistance because electrons collide with ions more often.

c)

Both have the same resistance because the material is the same.

d)

A short wire has greater resistance because it restricts current more strongly.

54.

Which comparison matches the effect of thickness on resistance for wires made of the same material and length?

a)

A thin wire has greater resistance than a thick wire.

b)

A thick wire has greater resistance than a thin wire.

c)

Thickness does not affect resistance.

d)

Both have equal resistance only if temperature increases.

55.

From the straight-line current–voltage graph for a resistor that passes through the origin, what does the graph indicate about the relationship between current and voltage?

a)

Current is inversely proportional to voltage.

b)

Current is directly proportional to voltage.

c)

Voltage is independent of current.

d)

The ratio I/VI/V decreases with current.

56.

For a resistor with an I–V graph that is a straight line through the origin, what quantity does the constant ratio VI\dfrac{V}{I} represent?

a)

Power

b)

Current

c)

Resistance

d)

Charge

57.

According to Ohm’s Law as shown, which rearranged form is correct?

a)

I=VRI=VR

b)

V=IRV=IR

c)

R=VIR=VI

d)

V=IRV=\dfrac{I}{R}

58.

Which device is identified as a non-ohmic component whose I–V graph is not a straight line and that does not obey Ohm’s Law?

a)

A resistor of constant resistance

b)

A filament lamp

c)

An ideal fixed-voltage source

d)

A metal wire kept at constant temperature

59.

For a filament lamp, as the current increases and the filament heats up, what happens to its resistance according to the I–V description?

a)

Resistance decreases because electrons move faster.

b)

Resistance stays constant because the material is metallic.

c)

Resistance increases due to more frequent collisions at higher temperature.

d)

Resistance oscillates with the AC supply frequency.

60.

Which set lists factors that affect the resistance of a material?

a)

Type of material (conductivity)

b)

Length of the material

c)

Cross-sectional thickness

d)

Temperature of the material

e)

Ambient light intensity

61.

Which qualitative effects are correctly paired with each factor affecting resistance: better conductor → lower resistance; longer material → higher resistance; thinner material → higher resistance; higher temperature → higher resistance?

a)

Better conductor gives lower resistance

b)

Longer length gives higher resistance

c)

Thinner cross-section gives higher resistance

d)

Higher temperature gives higher resistance

e)

Higher temperature gives lower resistance

62.

Which equation gives electrical power in a circuit?

a)

P=IVP=IV

b)

P=VIP=\dfrac{V}{I}

c)

P=IRP=IR

d)

P=1IVP=\dfrac{1}{IV}

63.

Which equation gives electrical energy transferred in a circuit over time?

a)

E=IVtE=IVt

b)

E=VIE=\dfrac{V}{I}

c)

E=IRE=IR

d)

E=V+I+tE=V+I+t

64.

What does the kilowatt-hour (kWh) represent?

a)

A unit of energy

b)

A unit of current

c)

A unit of potential difference

d)

A unit of resistance

65.

Which relationship represents electrical power?

a)

P=IVP=IV

b)

P=VtP=\dfrac{V}{t}

c)

P=IRP=I^{ }R

d)

P=1VP=\dfrac{1}{V}

66.

Which relationship for electrical energy is correct?

a)

E=IVtE=IVt

b)

E=VtE=Vt

c)

E=ItE=It

d)

E=VIE=\dfrac{V}{I}

67.

One kWh is equal to?

a)

3,600,000 J

b)

1 J

c)

3,600 J

d)

1,000 J

68.

1 kWh equals ?

a)

3.6 MJ3.6\,\text{MJ}

b)

360 J360\,\text{J}

c)

36 kJ36\,\text{kJ}

d)

0.36 MJ0.36\,\text{MJ}

69.

What is the relationship between the three currents in a series circuit?

a)

The current is the same at each point: I1=I2=I3I_1 = I_2 = I_3

b)

The current decreases around the loop: I1>I2>I3I_1 > I_2 > I_3

c)

The current increases around the loop: I1<I2<I3I_1 < I_2 < I_3

d)

The current splits equally so each is one-third of the total: I1=I2=I3=IT/3I_1 = I_2 = I_3 = I_T/3

70.

What is the relationship between the four Vs in a series circuit?

a)

VS=V1+V2+V3V_S = V_1 + V_2 + V_3

b)

VS=V1=V2=V3V_S = V_1 = V_2 = V_3

c)

VS=(V1+V2+V3)/3V_S = (V_1 + V_2 + V_3)/3

d)

VS=V1+V2−V3V_S = V_1 + V_2 - V_3

71.

How do you find total resistance in series?

a)

Add each resistance together: Rtotal=R1+R2+R3R_{\text{total}} = R_1 + R_2 + R_3

b)

Multiply the resistances together: Rtotal=R1R2R3R_{\text{total}} = R_1 R_2 R_3

c)

Add the reciprocals of the resistances: 1/Rtotal=1/R1+1/R2+1/R31/R_{\text{total}} = 1/R_1 + 1/R_2 + 1/R_3

d)

Subtract the smallest resistance from the largest

72.

What is the relationship between the four currents in a parallel circuit?

a)

The total current equals the sum of the branch currents: IT=I1+I2+I3I_T = I_1 + I_2 + I_3

b)

The current is the same in every branch: IT=I1=I2=I3I_T = I_1 = I_2 = I_3

c)

The total current equals the average of the branch currents: IT=(I1+I2+I3)/3I_T = (I_1 + I_2 + I_3)/3

d)

The total current equals the largest branch current: IT=max⁡(I1,I2,I3)I_T = \max(I_1, I_2, I_3)

73.

What is the relationship between the four voltages in a parallel circuit?

a)

Each branch voltage equals the supply: VS=V1=V2=V3V_S = V_1 = V_2 = V_3

b)

The supply equals the sum of the branch voltages: VS=V1+V2+V3V_S = V_1 + V_2 + V_3

c)

The supply equals the average branch voltage: VS=(V1+V2+V3)/3V_S = (V_1 + V_2 + V_3)/3

d)

The supply equals one branch voltage minus the others: VS=V1−V2−V3V_S = V_1 - V_2 - V_3

74.

The resistance rule in a parallel circuit?

a)

1RT=1R1+1R2+1R3\dfrac{1}{R_T} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + \dfrac{1}{R_3}

b)

RT=R1+R2+R3R_T = R_1 + R_2 + R_3

c)

RT=R1R2R3R1+R2+R3R_T = \dfrac{R_1 R_2 R_3}{R_1 + R_2 + R_3}

d)

RT=R1+R2+R33R_T = \dfrac{R_1 + R_2 + R_3}{3}

75.

Disadvantages of series circuits: When one component in a series circuit fails the whole circuit fails. Which statement best matches this idea?

a)

If one component stops working, only that component turns off while the rest keep working

b)

If one component stops working, the entire circuit stops working

c)

If one component stops working, other components get brighter

d)

If one component stops working, the total resistance becomes zero

76.

Disadvantages of series circuits: Choose the correct description of current and voltage in a series circuit.

a)

The current is the same at all points and the voltage is divided between components

b)

The current splits in each component and the voltage is the same across each component

c)

Both current and voltage are the same at all points

d)

The current is zero at the first component and increases after each component

77.

Disadvantages of series circuits: What happens to the brightness of each bulb as more bulbs are added in series?

a)

Each bulb becomes dimmer

b)

Each bulb becomes brighter

c)

Brightness stays exactly the same

d)

Bulbs alternately brighten and dim

78.

If more resistors are connected in parallel the total resistance will always ________. Select the correct outcome.

a)

increase

b)

decrease

c)

stay the same

d)

first increase then decrease

79.

Why does total resistance decrease when more resistors are connected in parallel?

a)

There are more branches through which the electricity can flow

b)

Each resistor converts more energy to heat

c)

The supply voltage increases automatically

d)

The resistors cancel each other's resistance

80.

Advantages of the parallel circuit: When one bulb fails, what happens to the rest of the circuit?

a)

The rest of the circuit continues to work

b)

The entire circuit stops working

c)

All remaining bulbs become dimmer and then fail

d)

The supply voltage doubles to compensate

81.

Advantages of the parallel circuit: How does adding more components in parallel affect the total resistance?

a)

Total resistance increases

b)

Total resistance stays constant

c)

Total resistance lowers

d)

Total resistance becomes infinite

82.

Advantages of the parallel circuit: What happens to the total current drawn when more components are added in parallel?

a)

Total current decreases

b)

Total current increases

c)

Total current stays the same

d)

Total current becomes zero

83.

Advantages of the parallel circuit: What is the voltage in each branch relative to the supply voltage, and how does this affect bulb brightness?

a)

Each branch has a lower voltage than the supply, so bulbs are dimmer than a single bulb

b)

Each branch has the same voltage as the supply, so bulbs are as bright as a single bulb

c)

Each branch has a higher voltage than the supply, so bulbs are brighter than a single bulb

d)

Voltage varies randomly between branches, so bulb brightness is unpredictable

84.

Which statement best describes alternating current (AC) in terms of its behavior over time?

a)

The current flows in one direction only.

b)

The current periodically reverses direction.

c)

The current is only present during specific intervals.

d)

The current remains constant regardless of time.

85.

What happens to the charge of an object when it gains electrons?

a)

It loses its charge completely.

b)

It remains neutral.

c)

It becomes negatively charged.

d)

It becomes positively charged.

86.
Thicker wires have _______ resistance than thinner wires.
a)
more
b)
less
c)
the same
87.
As the resistance in a circuit increases, the electric current __________.
a)
increases
b)
decreases
c)
stays the same
88.
Which formulas represents Ohm's law?
a)
V=IR
b)
R=IV
c)
I=RV
89.
What is the unit for resistance?
a)
Volts
b)
Amperes
c)
Ohms
90.
How many volts are in a circuit with a battery that has a resistance of 10 Ohms and a current of 2 Amps? 
a)
.5 Volts
b)
5 Volts
c)
20 Volts
91.
Electricity is the flow of _________.
a)
protons
b)
neutrons
c)
electrons
92.
If the battery produced 12.6 Volts and what would be the current flow be for a 6 Ohm resistor
a)
2.1 Amps
b)
2.4 Amps
c)
1.71 Amps
d)
15 Amps
93.

10C of charge flows in a wire every 2 seconds. Calculate the current in the wire.

a)

5 Ohms

b)

5 Amps

c)

0.2 Volts

d)

0.2 Amps

94.

Use the graph to find the current and calculate the resistance of this conductor when the voltage is 4V? Ignore the mA and just use A.

a)

2

b)

4

c)

1

d)

0.5

95.

Which graph represents a diode?

a)

A

b)

B

c)

C

d)

D

96.

Which graph represents a Filament bulb?

a)

A

b)

B

c)

C

d)

D

97.

Longer wires have _______ resistance than shorter wires.

a)

more

b)

less

c)

the same

98.

If a cell provides 12 V to a circuit and 4 Coulombs of charge flows. How much energy is being provided by the cell?

a)

3 J

b)

0.25 J

c)

48 J

d)

16 J

99.

Calculate the voltage of the 4 Ohm resistor in the circuit and use this answer to find the voltage of the across the heater.

a)

4.8 V and 7.2 V

b)

3 V and 9 V

c)

6 V and 6 V

d)

3.2 V and 9.8 V

100.

Two lamps of resistance 40ohm and 20ohm are connected in series to a battery of emf 6V. What is the current in the circuit and voltage across 40 ohm and 20 ohm.

(a)  

101.

A wire has a certain electrical resistance. The diameter and length of the wire may be changed. Which pair of changes must cause the resistance of the wire to increase?

a)

A

b)

B

c)

C

d)

D

102.

The circuit shown contains a battery, a 6 ohms resistor and two meters X and Y. One meter records current and one meter records potential difference.

a)

A

b)

B

c)

C

d)

D

103.

The diagram shows part of a circuit used to switch street lamps on and off automatically.

a)

A

b)

B

c)

C

d)

D

104.

P and Q are the circuit symbols for two electrical components. Which components are represented by P and by Q?

a)

A

b)

B

c)

C

d)

D

105.

The diagram shows a 10 ohms resistor and a 20 ohms resistor connected in a potential divider circuit. What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

106.

Which of these 4 circuits can be used to measure how the current varies with a change in voltage across a bulb?

a)
b)
c)
d)
107.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

fuse

c)

resistor

d)

diode

108.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

LDR

109.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

cell

110.

Which of these answers gives the correct way of connecting each meter?

a)

A

b)

B

c)

C

d)

D

111.

What is the correct name for the unit for measuring resistance?

a)

amp

b)

volt

c)

coulomb

d)

ohm

112.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What does p.d. stand for?

a)

potential difference

b)

potential divider

c)

power difference

d)

power divider

113.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What is the current through the resistor?

a)

2 mA

b)

2 A

c)

16 mA

d)

16 A

114.

To get a large current to flow in a wire, you can either

a)

increase the wire resistance or increase the supply voltage

b)

increase the wire resistance or decrease the supply voltage

c)

decrease the wire resistance or increase the supply voltage

d)

decrease the wire resistance or decrease the supply voltage

115.

Which of these answers gives the correct change in resistance for each component?

a)

A

b)

B

c)

C

d)

D

116.

The safety device that limits the current flow in a plug is the

a)

fuse

b)

cable grip

c)

earth wire

d)

insulation

117.

Where should the earth wire be connected inside a metal toaster?

a)

power supply

b)

heating element

c)

metal casing

d)

Earth wire not needed in a metal appliance

118.

A 240 volt, 3 amp heater is left running for 5 minutes.


Which of these gives the total energy output?

a)

3.6 kJ

b)

216 kJ

c)

72 kJ

d)

0.9 kJ

119.

Which of the following is the correct unit for charge?

a)

coulomb

b)

capacitance

c)

current

d)

charge

120.

A 6 V light bulb is switched on for a short time. A 6 V battery transfers 2 C of charge to the bulb in this time. What energy has been transferred?

a)

0.33 J

b)

3 J

c)

6 J

d)

12 J

121.

An electric heater connected to the mains supply has a power of 2200 W. The mains supply voltage is 230 V. Show that the current in the electric heater is approximately 10 A.

a)

2300 / 220 = 9.6 A

b)

2200 / 230 = 10 A

c)

2200 / 230 = 9.6 A

d)

2200 / 320 = 9.6 A

122.

Explain the meaning of the term "insulated wire".

a)

A wire encased in a hard polystyrene shell

b)

A wire covered with a non-conductive material (insulator) such as plastic or rubber

c)

A wire that is made of a non-conductive material (insulator) such as plastic or rubber

d)

A wire covered with a conductive material (conductor) such as metal

123.

A man pushes a metal trolley along a corridor towards a lift. The trolley has nylon wheels and the floor of the corridor is covered with plastic. The man wears shoes with rubber soles. As he moves the trolley, the man gains an electric charge.


Which choice indicates how the man gains an electric charge.

a)

Transfer of protons due to force between floor and lift

b)

Transfer of electrons due to force between shoes and wheel

c)

Transfer of electrons due to friction between floor and shoes

d)

The man doesn’t gain an electric charge.

124.

When a plastic rod is rubbed with a cloth, the rod gains charge.


How could you show that the plastic rod gains charge?

a)

Use charged object to check

b)

Attract scraps of paper

c)

Deflect water stream

d)

You cannot show plastic rod gains charge

125.

When a plastic rod is rubbed with a cloth, the rod gains charge. There are two types of charge.


Which choice shows how you could demonstrate this using different insulating rods and a cloth?

a)

Cannot charge rods and does not have any using.

b)

Charge rods and use charged gold leaf electroscope (GLE) and look for rise and fall of leaves

c)

Rubbing with the cloth as charging by force

d)

Using of charge rods and suspend it to observe for rise and fall.

126.

A car becomes electrically charged as it travels along a road.


Which choice indicates how a moving car becomes electrically charged.

a)

Reaction force between car and ground where electron transfer occur

b)

Friction between car and ground where proton transfer occur

c)

No force or friction present, but electron transfer occur

d)

Friction between car and ground where electron transfer occur

127.

A student creates this circuit. The current running through Lamp 1 is 2A and the voltmeter reading is 4V. Calculate the resistance of Lamp 1.

a)

2Ω

b)

2R

c)

2V

d)

4 Ohms

e)

5N

128.

What is the unit of electric current?

a)

Volt

b)

Ampere

c)

Watt

d)

Ohm

129.

Which component is used to measure voltage in a circuit?

a)

Ammeter

b)

Voltmeter

c)

Ohmmeter

d)

Galvanometer

130.

What happens to the total resistance in a series circuit when more resistors are added?

a)

Total resistance increases

b)

Total resistance remains the same

c)

Total resistance becomes zero

d)

Total resistance decreases

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