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Resistance and Resistivity

Total questions: 56

Worksheet time: 59mins

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 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.
Graph shows that _____________
a)
Resistance is directly proportional to Area
b)
Resistance is inversely proportional to Area
c)
Resistance is a constant while Area changes.
d)
Area is a constant while resistance changes.
6.
which has the highest current flowing through it?
a)
R1
b)
R2
c)
R3
d)
All the same
7.

Which one, top or bottom, offers more resistance?

a)

top

b)

bottom

c)

neither

8.
The unit to measure the resistivity of a wire is 
a)
ohms
b)
Volt 
c)
ohms.m
d)
ohms.s
9.

the current in the conductor

a)

R1=R2

b)

R1 > R2

c)

R2 > R1

d)

NONE OF THE ABOVE

10.
the  resistance of the two conductor 
a)
R2 > R3
b)
R2 = R3
c)
R2 < R3
d)
NONE OF THE ABOVE 
11.

The conductor with higher temperature has

a)

high resistance 

b)

low resistance 

c)

same resistance 

d)

it does not affect the resistance 

12.

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

13.
Materials that have a high electrical resistance
a)
less length
b)
less tempareture 
c)
more thickness 
d)
less cross sectional area
14.
Ampere second could be the unit of
a)
power
b)
conductance
c)
charge
d)
energy
15.

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

16.

What happens to resistance when the length of the wire increases?

a)

Stays the same

b)

Increases

c)

Decreases

17.

What effect does a hotter temperature have on resistance?

a)

No effect

b)

Increases resistance

c)

Decreases resistance

d)

Stays the same

18.

What other factor of a wire could affect its resistance?

a)

Material its made of

b)

How shiny it is

c)

Colour

19.
The type of current where charges flow in one direction
a)
Direct Current
b)
Alternating Current
c)
Electron Flow
d)
Voltage
20.

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.

21.

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.

22.

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.

23.

A 20-m wire of 0.10 mm2 cross-sectional area draws 0.5 A when connected across a 3.0-V potential difference.

(a) What is the resistance of the wire?

(b) What is the resistivity of the material from which the wire is made?

a)

(a) 1.5 Ω (b) 6.0 × 10-9 Ω • m

b)

(a) 1.5 Ω (b) 3.0 × 10-8 Ω • m

c)

(a) 6.0 Ω (b) 3.0 × 10-8 Ω • m

d)

(a) 6.0 Ω (b) 6.0 × 10-9 Ω • m

24.

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?


a)

power

b)

resistivity

c)

resistance

d)

1/(resistance)

25.
complete path that an electrical current travels along
a)
resistance
b)
circuit
c)
resistivity
d)
schematic
26.
current that flows through a circuit from the positive terminal of a battery through the circuit to the negative terminal of the battery
a)
drift acceleration
b)
drift velocity
c)
conventional current
d)
current density
27.
flow of charge through a cross-sectional area divided by the area
a)
drift acceleration
b)
drift velocity
c)
conventional current
d)
current density
28.
nonohmic circuit device that allows current flow in only one direction
a)

diode

b)

non-ohmic

c)

circuit

d)

ohmic

29.
measure of a material’s ability to conduct or transmit electricity
a)
electrical power
b)
electrical drift
c)
electrical conductivity
d)
electrical current
30.
rate at which charge flows, I=dQdt
a)
electrical power
b)
electrical drift
c)
electrical conductivity
d)
electrical current
31.

rate of change of energy in an electric circuit per unit of time

a)

electrical power

b)

electrical drift

c)

electrical conductivity

d)

electrical current

32.
(Ω) unit of electrical resistance, 1Ω=1V/A
a)
ampere (amp)
b)
nonohmic
c)
ohm
d)
ohmic
33.
empirical relation stating that the current I is proportional to the potential difference V; it is often written as V=IR , where R is the resistance
a)
ohmic
b)
nonohmic
c)
ohm
d)
Ohm’s law
34.
electric property that impedes current; for ohmic materials, it is the ratio of voltage to current, R=V/I
a)
circuit
b)
resistance
c)
resistivity
d)
schematic
35.
intrinsic property of a material, independent of its shape or size, directly proportional to the resistance, denoted by ρ
a)
circuit
b)
resistance
c)
resistivity
d)
schematic
36.
graphical representation of a circuit using standardized symbols for components and solid lines for the wire connecting the components
a)
resistance
b)
circuit
c)
resistivity
d)
schematic
37.

Is current density a scalar or vector quantity ?

(a)  

38.

A cell of emf (E) and internal resistance (r) draws a current (I). Write a relation between terminal voltage (V) in terms of E,I,r. ?

(a)  

39.

What is the unit of measurement for resistance?

a)

Voltage

b)

Ampere

c)

Watts

d)

Ohms

40.

A 3.0 Ω resistor and a 6.0 Ω resistor are connected in parallel.What is their combined resistance?

a)

0.50Ω

b)

2.0Ω

c)

4.5Ω

d)

9.0Ω

41.

The circuit diagram shows a 4.0 Ω resistor and an 8.0 Ω resistor connected to a 6.0V battery. What is the current in the battery?

a)

0.50A

b)

0.75A

c)

1.50A

d)

2.00A

42.

Consider a wire length L, cross-sectional area A and a resistance R. A second wire at the same temperature has a length 2L and a cross-sectional are of 1/2A. What is the resistance of the second wire

a)

R

b)

2R

c)

1/2 R

d)

4R

43.

What is the resistance of a wire when its length is reduced by half?

a)

Halved

b)

Quartered

c)

Doubled

d)

Quadrupled

44.

Xylene works in an electric company. She always recommends that longer extension cords should have a thicker diameter. Her recommendation made because resistance is __________.

a)

inversely with length and directly with cross-sectional area

b)

directly with length and inversely with cross-sectional area

c)

directly with both length and cross-sectional area

d)

inversely with both length and cross-sectional area

45.

The electrical resistance pf a metallic conductor is inversely proportional to its _____________.

a)

Temperature

b)

Length

c)

Cross-sectional area

d)

Resistivity

46.

What is the unit of used to specify the amount of resistance?

a)

Resistance

b)

Ampere

c)

Volts

d)

Ohm

47.

What symbol represented the unit Ohm?

a)

β\beta  

b)

α\alpha  

c)

Ω\Omega  

d)

ρ\rho  

48.

Which of the following is NOT included in the factors affecting resistance?

a)

Temperature

b)

Length

c)

Cross-sectional area

d)

Color

49.

What is the correct formular in getting the resistance?

a)

V=IxR

b)

ρ=RAL\rho=R\frac{A}{L}  

c)

I = PVI\ =\ \frac{P}{V}  

d)

None

50.

The unit of resistivity is

a)

Ω/m

b)

Ω/m2

c)

Ωm

d)

Ωm2

51.

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

a)

0.63 m

b)

63 m

c)

0.0063 m

d)

6.3 m

52.

A copper wire of length 2.5 m and cross-sectional area 2.4 × 10-7 m2 has a resistivity of 1.7x10-8 Ωm. What is the resistance of the wire?

a)

1.6x10-15 Ω

b)

1.0x10-14 Ω

c)

0.18 Ω

d)

5.6 Ω

53.

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

54.

The equation for a material with circular cross sectional area is A=

a)

πr2\pi r^2

b)

πr\pi r

c)

πd22\frac{\pi d^2}{2}

d)

πr3\pi r^3

55.

A wire of uniform diameter 0.28 mm and a length of 1.50 m has a resistance of 45 Ω. It's resistivity is

a)

2.2 x 10-8 Ωm

b)

36 Ωm

c)

1.8 x 10-6 Ωm

d)

3.4 x 10-7 Ωm

56.

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

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