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Worksheets

Electricity part 1

Total questions: 70

Worksheet time: 2hrs 53mins

Name
Class
Date
1.
Which copper wire has the lowest resistance?
a)
1 metre of 1 mm diameter wire
b)
0.5 metre of 1 mm diameter wire
c)
0.5 metre of 0.5 mm diameter wire
d)
1 metere of 0.5 mm diameter wire
2.

What happens to a resistance of conductor/resistor when the temperature is increased?

a)
Increases
b)
decreases
c)
stay the same
d)
vary randomly
3.
The length of a certain conductor of resistance 100 is doubled and its cross-sectional area is halved. Its new resistance is 
a)
100
b)
50
c)
200
d)
400
4.
Factor which does not affect the resistance
a)
Type of material
b)
Length of material
c)
Mass of the material
d)
Area of the material
5.
which has the highest current flowing through it?
a)
R1
b)
R2
c)
R3
d)
All the same
6.
The unit to measure the resistivity of a wire is 
a)
ohms
b)
Volt 
c)
ohms.m
d)
ohms.s
7.

the current in the conductor

a)

R1=R2

b)

R1 > R2

c)

R2 > R1

d)

NONE OF THE ABOVE

8.
the  resistance of the two conductor 
a)
R2 > R3
b)
R2 = R3
c)
R2 < R3
d)
NONE OF THE ABOVE 
9.
The conductor with higher temperature 
a)
high resistance 
b)
low resistance 
c)
same resistance 
d)
it does not affect the resistance 
10.

The length of a certain conductor of resistance 100 is doubled and its cross-sectional area is doubled. Its new resistance is

a)

100

b)

50

c)

200

d)

400

11.
Materials that have a high electrical resistance
a)
less length
b)
less tempareture 
c)
more thickness 
d)
less cross sectional area
12.
Ampere second could be the unit of
a)
power
b)
conductance
c)
charge
d)
energy
13.

The resistance of a piece of wire does not depend on _________________.

a)

wire material

b)

wire mass

c)

wire length

d)

wire cross sectional area

14.
The type of current where charges flow in one direction
a)
Direct Current
b)
Alternating Current
c)
Electron Flow
d)
Voltage
15.
The type of current where charges shake back and forth in a circuit
a)
Alternating Current
b)
Direct Current
c)
Voltage 
d)
Switchback Current
16.

The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?

a)

It is increased by a factor of 2.

b)

It is increased by a factor of 4.

c)

It is reduced by a factor of 2.

d)

It is reduced by a factor of 4.

17.

The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?

a)

It is 2 times as large.

b)

It is 3 times as large.

c)

It is 4 times as large.

d)

It is 1/2 as large.

18.

Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?

a)

Both wires have the same resistivity.

b)

The longer wire has 3 times the resistivity of the shorter wire.

c)

The longer wire has 9 times times the resistivity of the shorter wire.

d)

The longer wire has 27 times times the resistivity of the shorter wire.

19.

A tungsten wire has resistance R at 20°C. A second

tungsten wire at 20°C has twice the length and half the

cross-sectional area of the first wire. In terms of R,

the resistance of the second wire is ...

a)

R/2

b)

R

c)

2R

d)

4R

20.

The nichrome wire has a cross-sectional area of 1.3 × 10–7 m2 . Resistivity of nichrome = 1.1 × 10–6Ωm and a resistance of 53Ω. The length of the wire is

a)

0.63m

b)

63m

c)

0.0063m

d)

6.3m

21.

A cylindrical conductor of length l, diameter D, and resistivity ρ has a resistance R. What is the resistance of another cylindrical conductor of length l, diameter D/2 , and resistivity ρ?

a)

8R

b)

4R

c)

2R

d)

R

22.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
23.

Which of the following groups of materials are listed in

order of best conductor to worst conductor?

a)

iron, copper, silver

b)

iron, platinum, mercury

c)

tungsten, aluminum, nichrome

d)

platinum, gold, copper

24.

The following resistors are made of the same

material. Rank them from greatest resistance to

least resistance.

a)

Rx > Rw > Rz > Ry

b)

Rz > Ry > Rx > Rw

c)

Ry > Rz > Rw > Rx

d)

Ry > Rw > Rz > Rx

25.

What diameter of 100 m long copper wire would

have a resistance of 0.10 Ω?


p(Cu) = 1.68 x 10^-8

a)

2.2 mm

b)

3.7 mm

c)

4.6 mm

d)

5.4 mm

26.

The length of a copper wire is cut in half. By what

factor does the resistance change ?

a)

1/4

b)

1/2

c)

2

d)

4

27.

The two resistors shown are both uniform cylinders of equal length made from the same conducting putty.


The diameter of Y is twice that of X. The resistance of Y is R.


What is the total resistance of the combination?

a)

4R5\frac{4R}{5}

b)

3R

c)

4R

d)

5R

28.

A wire has a resistance R.


What is the resistance when both the length and radius of the wire are doubled?

a)

R4\frac{R}{4}

b)

R2\frac{R}{2}

c)

2R

d)

4R

29.

Which graph shows the variation of the resistance with temperature for an ntc thermistor?

a)

A

b)

B

c)

C

d)

D

30.

The table shows the resistivity, length and cross-sectional area of wires P and Q.


The resistance of wire P is R.


What is the total resistance of the wires when they are connected in parallel?

a)

R9\frac{R}{9}

b)

R3\frac{R}{3}

c)

2R3\frac{2R}{3}

d)

3R2\frac{3R}{2}

31.

Which graph shows how the resistance per unit length r of a wire varies with diameter D of the wire?

a)
b)
c)
d)
32.

The resistance of a negative temperature coefficient (ntc) thermistor

a)

increases as temperature increases.

b)

is constant at temperatures below 0 °C.

c)

increases as temperature decreases.

d)

falls to zero when a critical temperature is reached.

33.

The unit of potential difference can be expressed as

a)

C s–1

b)

J C–1

c)

V A–1

d)

J A–1

34.

This is the formula for which physical quantity  ρlA\frac{\rho l}{A}  

a)

PP  power

b)

VV  voltage

c)

ρ\rho  resistivity

d)

RR  resistance

35.

Which change decreases the resistance of a piece

of copper wire?

a)

increasing the wire‛s length

b)

increasing the wire‛s resistivity

c)

decreasing the wire‛s length

d)

decreasing the wire‛s diameter

36.

Which is a thermistor?

a)
b)
c)
d)
37.

Which is a light-emitting diode?

a)
b)
c)
d)
38.

Which is an application of NTC thermistors?

a)

Fire sensor

b)

Motion sensor

c)

Automatic night lamps

39.

Which component has the I-V graph shown?

a)

NTC thermistor

b)

filament bulb

c)

diode

d)

ohmic resistor

40.

Two resistors R1 and R2 are made of wires of the same material. The wire used for R1 has half the diameter and is twice as long as the wire used for R2.

What is the value of the ratio resistance of R1 / resistance of R2?

a)

8

b)

4

c)

1

d)

0.5

41.

An ammeter must have

a)

Low resistance so that it does affect the current through the main circuit

b)

High resistance so that it does affect the current through the main circuit

c)

Low resistance so that it does affect the voltage across the resistor

42.

Where would you place an ammeter in the circuit?

a)

Green ?

b)

Red ?

43.

Where would you place a voltmeter in the circuit?

a)

Green ?

b)

Red ?

44.

What is the purpose of an ammeter in a circuit?

a)

To measure resistance.

b)

To measure power.

c)

To measure electric current.

d)

To measure voltage.

45.

What is the purpose of a voltmeter in a circuit?

a)

To measure temperature

b)

To measure current flow

c)

To measure voltage or potential difference

d)

To measure resistance

46.

What is the unit of measurement for current?

a)

D

b)

A

c)

C

d)

B

47.

What is the unit of measurement for voltage?

a)

amps

b)

ohms

c)

watts

d)

volts

48.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
49.
What does this circuit symbol represent?
a)
diode
b)
light-dependent resistor (LDR)
c)
lamp
d)
light-emitting diode
50.
What does this circuit symbol represent?
a)
diode
b)
light-dependent resistor (LDR)
c)
lamp
d)
light-emitting diode
51.
Correctly identify component A, B and C
a)
A = Switch, B= Cell, C= LDR
b)
A= Cell, B= Switch, C= Diode
c)
A= Switch, B= Lamp, C= Diode
d)
A= Switch, B= Cell, C= Diode
52.
Resistance is a measure of....
a)
the energy per unit charge in a circuit
b)
how hard it is for electrons to move through the circuit
c)
how hard it is for electrons to move through the battery
d)
the number of charge carriers in a circuit
53.
a)

Ammeter

b)

Ampere

c)

And

54.
a)

zig zag

b)

Resistor

c)

Ammeter

55.
The movement of electrons from atom to atom in a line results in a flow of _____. 
a)
amperage.
b)
electric current.
c)
electromagnetic connectors. 
56.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
57.

Which statement is true?

a)

The light bulb will light up because the circuit is complete.

b)

The light bulb will light up because the circuit is broken.

c)

The light bulb will not light up because the circuit is complete.

d)

The light bulb will not light up because the circuit is open.

58.

What is the name of an electrical measuring instrument that used to measure an electrical quantities like Current , voltage and resistance?

a)

Voltmeter

b)

Ammeter

c)

Ohmmeter

d)

Multimeter

59.

What is the name of an electrical measuring instrument that used to measure an electrical current ?

a)

Voltmeter

b)

Ammeter

c)

Ohmmeter

d)

Multimeter

60.

What is the name of an electrical measuring instrument that used to measure an electrical voltage ?

a)

Voltmeter

b)

Ammeter

c)

Ohmmeter

d)

Multimeter

61.

What is the name of an electrical measuring instrument that used to measure an electrical resistance?

a)

Voltmeter

b)

Ammeter

c)

Ohmmeter

d)

Multimeter

62.
What variable is a Coulomb the unit for?
a)
Charge
b)
Force
c)
Distance
d)
Mass
63.
A material in which electrons are not able to move easily 
a)
Circuit 
b)
Insulator 
c)
Resistance 
d)
Conductor
64.

An electric kettle is commonly used to heat up water at home. The heating element used is nichrome wire and not copper. Which of the following reasons best explains why nichrome is used instead of copper?

a)

Nichrome conducts more current than copper, so more heat can be generated.

b)

Nichrome has higher resistance than copper, so more heat can be generated.

c)

Nichrome has higher voltage than copper, so more heat can be generated.

d)

Nichrome are cheaper than copper, so it is more economical.

65.
What is the difference between a conductor and an insulator?
a)
An insulator allows electricity to flow through it easily and a conductor does not
b)
A conductor allows electricity to flow through it easily and an insulator does not.
c)
An insulator is magnetic and a conductor is not
d)
A conductor is magnetic and an insulator is not
66.

In the equation I = nAvq, what does v represent?

a)

The speed of the electrons

b)

The average speed of the electrons

c)

The velocity of the electrons

d)

The average velocity of the electrons

e)

the fastest speed of all electrons

67.

If the current in a specific copper wire increases this can be due to _____________________.

a)

An increase in the charge carrier density

b)

An increase in the electron drift speed

c)

An increase in its cross sectional area

d)

An increase in the charge of electrons

68.

Directions of drift velocity of electrons and electric field are

a)

In same direction

b)

Opposite to each other

c)

Fluctuated

d)

None of above

69.

Drift velocity is

a)

The average velocity with which the electrons are drifted towards the positive terminal of the battery.

b)

Velocity of an electron in a conductor

c)

Average thermal velocity

d)

None of these

70.

The path of electron in a conductor is

a)

Random

b)

Straight line

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