Multiple Choice Questions
Electricity
Practice Questions with Answers
Total 120 questions available
Q. 1
The household circuits are connected in:
A
seriesB
parallelC
both series and parallelD
neither series nor parallelClick an option to check your answer
Q. 2
If you increase the voltage across a conductor, what happens?
A
The resistance will increase.B
The resistance will decrease.C
The current will decrease.D
The current will increase.Click an option to check your answer
Q. 3
Who first established Ohm's law?
A
George Simon OhmB
Michael FaradayC
Thomas EdisonD
Nikola TeslaClick an option to check your answer
Q. 4
A neutral body has equal amount of :
A
Both positive and negative chargesB
Only positive chargeC
Only negative chargeD
No charge at allClick an option to check your answer
Q. 5
Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them are in the ratio
A
0.0423611111111111B
0.0840277777777778C
0.0430555555555556D
0.167361111111111Click an option to check your answer
Q. 6
When a 4 V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. The value of the resistance of the resister is:
A
40ΩB
400ΩC
0.4 ΩD
4ΩClick an option to check your answer
Q. 7
What does resistivity refer to in terms of a conductor?
A
Its resistance per unit areaB
Its resistance per unit lengthC
Its ability to conduct electricityD
Its ability to generate electric chargeClick an option to check your answer
Q. 8
Three equal resistances when combined in series are equivalent to 90w. Their equivalent resistance when combined in parallel will be
A
810 WB
10 WC
270 WD
30 WClick an option to check your answer
Q. 9
A current of 1 A is drawn by a filament of an electric bulb. The number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:
A
1016B
1018C
1023D
1020Click an option to check your answer
Q. 10
Electricity constituted by moving electric charges, is called :
A
positive electricityB
static electricityC
current electricityD
negative electricityClick an option to check your answer
Q. 11
Potential difference in a circuit in which components are connected in series
A
Gets divided across each componentB
Potential difference does not appearC
Gets distributed equallyD
Remains the same across each componentClick an option to check your answer
Q. 12
All the following statements are correct except :
A
The presence of moisture in the air reduces its conductivityB
None of the aboveC
When a body is charged positively, some electrons escape from it.D
A body is said to be negatively charged when it has got excess of electrons.Click an option to check your answer
Q. 13
Electron volt is a measure of :
A
energyB
chargeC
currentD
electric potentialClick an option to check your answer
Q. 14
The amount of work done in moving a charge of 2C across two points having a potential difference of 24 V is
A
54JB
50JC
24 JD
48JClick an option to check your answer
Q. 15
If a current of 5 amps flows through a resistor of 20 ohms for 30 minutes, how much energy is transformed?
A
90 kilojoulesB
80 kilojoulesC
60 kilojoulesD
40 kilojoulesClick an option to check your answer
Q. 16
Electrical resistivity of an alloy of copper
and nickel is ______ when compared with
the electrical resistivity of an alloy of copper,
manganese and nickel.
A
moreB
lessC
doubleD
sameClick an option to check your answer
Q. 17
What does the slope of a V-I (voltage-current) graph represent?
A
PowerB
ChargeC
ResistanceD
Reciprocal of resistanceClick an option to check your answer
Q. 18
There are three resistors connected in parallel, the resistance of each resistor is 3 ohm. What is the
total resistance of all the three resistors ?
A
6ΩB
15ΩC
3ΩD
1ΩClick an option to check your answer
Q. 19
The potential at a point is 20V. The work done to bring a charge of 0.5 C from infinity to this point will be ?
A
20JB
5JC
40JD
10JClick an option to check your answer
Q. 20
Commercial unit of electrical energy is :
A
Kilowatt hourB
CalorieC
All of theseD
JouleClick an option to check your answer
Q. 21
Two heater wires of same length and material but of different thickness are connected in series across a power supply. The power dissipated :
A
Will be more in thinner wireB
Will be more in thicker wireC
Cannot be predictedD
Will be same in bothClick an option to check your answer
Q. 22
Four cells each of e.m.f E are joined in parallel to form a battery. The equivalent e.m.f of the battery will be
A
E / 4B
E = 0C
ED
4 EClick an option to check your answer
Q. 23
Which statement is incorrect?
A
Higher resistance means less power consumed.B
Lower resistance results in drawing more voltage.C
Higher resistance leads to higher current flow.D
Higher resistance means less voltage drawn.Click an option to check your answer
Q. 24
There is a dual of 8 ohm resistance on the aerial.
Determine the aerial's new resistance.
A
2ΩB
10 ΩC
4ΩD
ΖΩClick an option to check your answer
Q. 25
How does resistivity relate to the resistance of a material?
A
They are the same thingB
They are directly proportionalC
They are inversely proportionalD
They have no relationshiClick an option to check your answer
Q. 26
The instrument used for measuring electric
current is:
A
voltmeterB
galvanometerC
ammeterD
potentiometerClick an option to check your answer
Q. 27
An electric bulb is rated 220 V and 100 W. When it
is operated on 110 V, the power consumed will be:
A
25 WB
50 WC
75WD
100 WClick an option to check your answer
Q. 28
A 2 KW boiler used for 1 hour everyday consumes the following electrical energy in thirty days :
A
120 unitsB
15 unitsC
None of theseD
60 unitsClick an option to check your answer
Q. 29
Electrical resistivity of a given metallic wire
depends upon:
A
its shapeB
its lengthC
nature of the materialD
its thicknessClick an option to check your answer
Q. 30
What happens to the current flowing through each resistor in a parallel connection?
A
It remains the sameB
It decreasesC
It increasesD
It variesClick an option to check your answer
Q. 31
Let us consider the flow of the current through
a metallic wire, if the temperature of the entire
system increases. What will happen from the
following options ?
A
Potential difference (V) increasesB
V and R remain the sameC
Potential difference (V) decreasesD
Resistance (R) decreasesClick an option to check your answer
Q. 32
If a lamp has a power of 60 watts, how much energy does it dissipate in one minute?
A
360 joulesB
36 joulesC
3.6 joulesD
3600 joulesClick an option to check your answer
Q. 33
If a heater uses a certain amount of energy (E), what happens to the energy dissipated if the duration of operation is doubled?
A
It becomes halfB
It doublesC
It becomes four timesD
It remains the sameClick an option to check your answer
Q. 34
A piece of wire of resistance R is cut into five equal
parts. These parts are then connected in parallel.
If the equivalent resistance of this combination is
R', then the ratio R/R' is :
A
1/5B
1 /25C
25D
5Click an option to check your answer
Q. 35
The equivalent resistance of a series combination
of two resistances is X ohm. If the resistances are
of 10 2 and 40 22 respectively, the value of X will
be:
A
50 ΩB
40 ΩC
20 ΩD
10ΩClick an option to check your answer
Q. 36
How is resistivity commonly represented?
A
Ω (ohm)B
m (meter)C
A (ampere)D
p (Greek letter)Click an option to check your answer
Q. 37
What is resistivity?
A
The ability of a material to conduct electricityB
The resistance of a material to electric currentC
The inverse of electrical conductivityD
The measure of electric chargeClick an option to check your answer
Q. 38
Unit of potential difference is :
A
CoulombB
Joule/CoulombC
VoltD
(a) and (b) are correctClick an option to check your answer
Q. 39
What is the SI unit of electrical resistivity?
A
Ohm (Ω)B
Meter (m)C
Ohm-meter (Ω·m)D
Ampere (A)Click an option to check your answer
Q. 40
According to Ohm's law, what happens to the current passing through a metallic conductor when the potential difference across its ends is increased?
A
It decreasesB
It remains constantC
It increasesD
It becomes zeroClick an option to check your answer
Q. 41
The resistance of the wire when the length of the wire increases two times
A
Becomes 4 timesB
Becomes 2 timesC
Becomes 3 timesD
Becomes 6 timesClick an option to check your answer
Q. 42
What type of materials used in circuits do not follow the direct relationship between voltage and current as described by Ohm's law?
A
InsulatorsB
SuperconductorsC
ResistorsD
Non-Ohmic materials"Click an option to check your answer
Q. 43
The values of mA and uA are :
A
10-3 and 10-6 A respectivelyB
10-3 and 10-⁹ A respectivelyC
10-6 and 10-3 A respectivelyD
106 and 10-⁹ A respectivelyClick an option to check your answer
Q. 44
When there is an electric current passing through a wire, the particles moving are
A
IonsB
ElectronsC
ProtonsD
AtomsClick an option to check your answer
Q. 45
The slope of voltage (V) versus current (I) curve is called :
A
ConductivityB
ResistanceC
ConductanceD
ResistivityClick an option to check your answer
Q. 46
Ohms law relates potential difference with
A
TimeB
PowerC
EnergyD
CurrentClick an option to check your answer
Q. 47
The device used for measuring potential difference is known as ?
A
PotentiometerB
VoltmeterC
GalvanometerD
AmmeterClick an option to check your answer
Q. 48
Watt hour is also called :
A
Board of trade unitB
volt-ampere hour (VAH)C
None of theseD
Horse powerClick an option to check your answer
Q. 49
For commercial purposes, what unit is commonly used to measure electrical energy?
A
Watt-hourB
Kilowatt-hourC
MegajouleD
GigawattClick an option to check your answer
Q. 50
The resistivity does not change if
A
the temperature is changedB
the material is changedC
both material and temperature are changedD
the shape of the resistor is changedClick an option to check your answer
Q. 51
The work done in moving a unit positive charge across two points inan electric circuit is a measure of ?
A
PowerB
ResistanceC
Potential differenceD
CurrentClick an option to check your answer
Q. 52
To determine the equivalent resistance of two resistors, when connected in series, the correct way of connecting ammeter and voltmeter in the circuit is-
A
ammeter in parallel and voltmeter in seriesB
Both ammeter and voltmeter in seriesC
ammeter in series and voltmeter in parallelD
Both ammeter and voltmeter in parallelClick an option to check your answer
Q. 53
On which of the given factors, resistance does not
depend:
A
temperatureB
densityC
length of conductorD
area of cross-sectionClick an option to check your answer
Q. 54
What does a low resistivity indicate about a material?
A
It conducts electric current readilyB
It resists electric current stronglyC
It has high electrical resistanceD
It is a poor conductor of electricityClick an option to check your answer
Q. 55
The space around a charge in which some other charge experiences attraction or repulsion, is called its:
A
Electric fieldB
Electric field intensityC
Potential differenceD
PotentialClick an option to check your answer
Q. 56
The path of a free electron in a metal is-
A
ParabolicB
CircularC
Zig zagD
A straight lineClick an option to check your answer
Q. 57
If you double both the voltage and the resistance in a circuit, what happens to the current?
A
It doubles.B
The current remains the same.C
It quadruples.D
It halves.Click an option to check your answer
Q. 58
If the resistance of a certain copper wire is 1 Ω, then the resistance of a similar nichrome wire will be about:
A
45 ΩB
25 ΩC
30 ΩD
60 ΩClick an option to check your answer
Q. 59
A cylindrical conductor of length 'l' and uniform
area of cross-section 'A' has resistance 'R'. The
area of cross-section of another conductor of same
material and same resistance but of length '2l' is :
A
1.5 AB
2AC
3 AD
0.5 AClick an option to check your answer
Q. 60
Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the Ω0 W bulb will be:
A
1 AB
0.8 AC
0.4 AD
0.6 AClick an option to check your answer
Q. 61
In a parallel connection, how is the total resistance calculated?
A
By adding individual resistancesB
By multiplying individual resistancesC
By dividing individual resistancesD
By subtracting individual resistancesClick an option to check your answer
Q. 62
Which of the following does not apply to silver ?
A
The resistance provided is inversely proportional to the area of cross section.B
The movement of electrons on their outer most orbital is tightly held together.C
Their resistivity is in the range 10-8 - m to 10-6 Ω - m.D
The resistance provided is directly proportional to its length.Click an option to check your answer
Q. 63
Student sets- up an electric circuit for the verification of Ohm’s law. He observes that voltmeter reading gets in reversed direction. The student should
A
Reverse connection of voltmeterB
Connect voltmeter in seriesC
decrease resistance with the help of rheostatD
Get the voltmeter replacedClick an option to check your answer
Q. 64
For which of the following substances, resistance decreases with temperature
A
CopperB
CarbonC
MercuryD
PlatinumClick an option to check your answer
Q. 65
The amount of heat energy produced in 5 minutes by an electric heater rated at 1000 W is
A
2 × 105 JB
4 × 105 JC
300 JD
3 × 105 JClick an option to check your answer
Q. 66
The resistivity of a wire depends on
A
MaterialB
LengthC
Length, material and area of cross sectionD
Area of cross sectionClick an option to check your answer
Q. 67
What factor does resistivity take into account in its measurement?
A
Material's massB
Material's temperatureC
Material's volumeD
Material's colorClick an option to check your answer
Q. 68
Resistance of the wire is given by
A
R= IVB
R= I2VC
R= I/VD
R= V/IClick an option to check your answer
Q. 69
Which of the following is an ohmic resistor
A
DiodeB
NichromeC
DiamondD
GermaniumClick an option to check your answer
Q. 70
In a voltmeter there are 20 divisions between 0 to 0.5 the least count of voltmeter is
A
0.050B
0.0020C
0.250D
0.025Click an option to check your answer
Q. 71
Heat produced in a current carrying wire in 5s is 60J. The same current is passed through another wire of half the resistance. The heat produced in 5s will be
A
120 JB
15 JC
30 JD
60 JClick an option to check your answer
Q. 72
The accumulator which is used for the domestic
purpose has the electromotive force of 10 V and
with an internal resistance of 0.8 2 is externally
charged by 150 V of the direct current power
supply using a series resistor 18 2. Calculate the
terminal voltage of the accumulator during using.
A
11.3 VB
6.8 VC
15.9 VD
17.1 VClick an option to check your answer
Q. 73
An battery is used to
A
Safeguard against short - circuitB
Measure electric potentialC
Maintain a potential differenceD
Measure electric currentClick an option to check your answer
Q. 74
At the time of short circuit, the electric current in the circuit:
A
increases heavilyB
vary continuouslyC
does not changeD
reduces substantiallyClick an option to check your answer
Q. 75
Which type of connection ensures that the current flowing through each resistor remains the same?
A
Series connectionB
Parallel connectionC
Both a and bD
Neither a nor bClick an option to check your answer
Q. 76
Which of the following statements is true about the relationship between joules and kilowatt-hours?
A
1 kilowatt-hour is equal to 3.6 joulesB
1 kilowatt-hour is equal to 3.6 million joulesC
1 joule is equal to 3.6 kilowatt-hoursD
1 joule is equal to 3.6 × 10^-6 kilowatt-hoursClick an option to check your answer
Q. 77
In a series connection, how is the total resistance calculated?
A
By subtracting individual resistancesB
By adding individual resistancesC
By multiplying individual resistancesD
By dividing individual resistancesClick an option to check your answer
Q. 78
What happens to the total resistance when resistors are connected in series?
A
It increasesB
It decreasesC
It remains the sameD
It variesClick an option to check your answer
Q. 79
Which property does resistivity measure?
A
The ability to store electrical chargeB
The ability to conduct heatC
The ability to resist or conduct electric currentD
The ability to generate magnetic fieldsClick an option to check your answer
Q. 80
An electric fuse is connected with :
A
neutral wireB
live wireC
parallel to the line wireD
earthingClick an option to check your answer
Q. 81
A current of 0.5A is drawn by a filament of an electric bulb for 10 minutes. The amount of electric charge flowing through the bulb is
A
600cB
500CC
300CD
400CClick an option to check your answer
Q. 82
How many joules are equivalent to 1 kilowatt-hour of electrical energy?
A
3.6 × 10^6B
1 × 10^3C
3.6 × 10^3D
1 × 10^6Click an option to check your answer
Q. 83
Why is using joules impractical for measuring large quantities of electrical energy?
A
Joules are not a standard unitB
Joules are inconvenient to calculateC
Joules are too large a unitD
Joules are too small a unitClick an option to check your answer
Q. 84
Which of the following obeys Ohm's law ?
A
TransistorB
Filament of a bulbC
LEDD
NichromeClick an option to check your answer
Q. 85
Current flows through a wire only when there is ___________between the ends of the wire.
A
Potential difference at one end is more than at the other endB
Work is done in moving a chargeC
Potential differenceD
All of the aboveClick an option to check your answer
Q. 86
Joule/Coulomb is same as ?
A
WattB
VoltC
AmpereD
OhmClick an option to check your answer
Q. 87
In a series connection of resistors, how do potential differences across each resistor behave?
A
They remain the sameB
They decreaseC
They increaseD
They varyClick an option to check your answer
Q. 88
The current in a wire
A
Does not depend on resistance and potential differenceB
Depends only on the resistance of the wireC
Depends only on the potential difference appliedD
Depends on both resistance and potential differenceClick an option to check your answer
Q. 89
Two resistances 10 and 3 are connected in parallel across a battery. If there is a current of 0.2 A in 10 2 resistor, the voltage supplied by the battery is:
A
2 VB
1VC
4 VD
8VClick an option to check your answer
Q. 90
The resistance of a resistor is reduced to half of its
initial value. In doing so, if other parameters of
the circuit remain unchanged the heating effects
on the resistor will become:
A
halfB
one - fourthC
four timesD
two timesClick an option to check your answer
Q. 91
Substances whose atoms have more free electrons are called :
A
ElectrolytesB
Semi-conductorsC
ConductorsD
InsulatorsClick an option to check your answer
Q. 92
The resistance of the wire when the length of the
wire increases two times :
A
becomes 6 timesB
becomes 3 timesC
becomes 4 timesD
becomes 2 timesClick an option to check your answer
Q. 93
Electric current is :
A
work done per unit timeB
Resistance per unit timeC
All of theseD
flow of charge per unit timeClick an option to check your answer
Q. 94
What is the SI unit of electrical energy?
A
WattB
VoltC
JouleD
Kilowatt-hourClick an option to check your answer
Q. 95
If a 9-volt battery is connected to a conductor, and the current flowing through it is 0.1 ampere, what is the resistance?
A
90 ohmsB
0.9 ohmsC
9 ohmsD
900 ohmsClick an option to check your answer
Q. 96
What is not true for electric charge :
A
S.I. unit of charge is coulombB
One coulomb is charge of one electronC
Charge on a body may be + ve or – veD
Electric charge is scalar quantityClick an option to check your answer
Q. 97
The resistivity of alloys is:
A
verylowB
very highC
generally lower than its constituent metalsD
more than resistivity of insulatorsClick an option to check your answer
Q. 98
A positive charge released from rest
A
Moves towards the regions of equal potentialB
Does not moveC
Moves towards the regions of lower potentiaD
Moves towards the regions of higher potentialClick an option to check your answer
Q. 99
When resistors are connected in parallel, what remains constant across each resistor?
A
CurrentB
ResistanceC
VoltageD
PowerClick an option to check your answer
Q. 100
Unit of electric power may also be expressed as:
A
kilowatt-hourB
watt-secondC
joule-secondD
volt-ampereClick an option to check your answer
Q. 101
What is immaterial for an electric fuse wire?
A
Its lengthB
Current flowing through itC
Its radiusD
Its specific resistanceClick an option to check your answer
Q. 102
A wire of length 1 and of radius of cross-section r has a resistance of R 2. Another wire of same material and of radius of cross-section 2r will have the same R if the length is:
A
1/4B
21C
1/2D
41Click an option to check your answer
Q. 103
A sure test of electrification is :
A
RepulsionB
FrictionC
InductionD
AttractionClick an option to check your answer
Q. 104
What happens to the total resistance when resistors are connected in parallel?
A
It increasesB
It decreasesC
It remains the sameD
It variesClick an option to check your answer
Q. 105
Work done in moving a unit positive test charge from one point to another inside an electric field, is called:
A
Potential differenceB
Field intensityC
FieldD
PotentialClick an option to check your answer
Q. 106
Which class of materials is known to generally follow Ohm's law?
A
InsulatorsB
SuperconductorsC
SemiconductorsD
Metallic conductorsClick an option to check your answer
Q. 107
Two conducting wires of the same material and
of equal lengths and equal diameters are first
connected in series and then in parallel in a
circuit across the same potential difference. The
ratio of power produced in series and parallel
combinations would be:
A
1:4B
4:1C
2:1D
1:2Click an option to check your answer
Q. 108
Consider the room temperature is 24°C in summer,
the electrical resistance of thermocoil which is
used in the AC unit is 150 2. Then calculate the
temperature of the thermocoil if the electrical
resistance is 175 2. Given the temperature
coefficient of the thermocoil is 2.98 x 10-4 °C-1.
A
546°CB
597°CC
512°CD
583°CClick an option to check your answer
Q. 109
The values of mA and μA are:
A
10–3 and 10–6 A respectivelyB
10–3 and 10–9 A respectivelyC
10–6 and 10–3 A respectivelyD
10–6 and 10–9 A respectivelyClick an option to check your answer
Q. 110
How is the electrical energy consumed by an appliance calculated?
A
By multiplying its voltage and currentB
By dividing its power by the duration of useC
By adding its power and duration of useD
By multiplying its power rating and duration of useClick an option to check your answer
Q. 111
Law which gives force between two charges is :
A
None of theseB
Coulomb’s lawC
Faraday’s LawD
Ohm’s lawClick an option to check your answer
Q. 112
Electric fuse is connected with:
A
neutral wireB
parallel to the line wireC
earthingD
Live wireClick an option to check your answer
Q. 113
Which among the following is the correct way
of connect ammeter and voltmeter in the circuit
to determine the equivalent resistance of two
resistors in series?
A
Both ammeter and voltmeter in seriesB
Both ammeter and voltmeter in parallelC
Ammeter in parallel and voltmeter in seriesD
Ammeter in series and voltmeter in parallelClick an option to check your answer
Q. 114
5 C/S is same as :
A
5 voltB
5 jouleC
5 AD
5 mAClick an option to check your answer
Q. 115
The condition for an electric charge to flow from one point to other is that the two points must have electric:
A
Circuit (closed)B
CurrentC
Potential differenceD
(a) & (c) both are correctClick an option to check your answer
Q. 116
Electrical resistivity of a given metallic wire depends upon:
A
Nature of the materialB
Its lengthC
Its thicknessD
Its shapeClick an option to check your answer
Q. 117
A body gets positively charged by loosing :
A
ProtonsB
α -particlesC
ElectronsD
NeutronsClick an option to check your answer
Q. 118
A piece of aluminium of finite length is drawn or stretched such that to reduce its diameter to one fourth its original value, its resistance will become
A
sixteen timesB
256 timesC
four timesD
eight timesClick an option to check your answer
Q. 119
What does the constant ""k"" represent in Ohm's law equation?
A
Resistance offered by the conductorB
Current flowing through the conductorC
Voltage appliedD
Conductivity of the materialClick an option to check your answer
Q. 120
What is the relationship established by Ohm's law?
A
The direct proportionality between current and resistanceB
The direct proportionality between voltage and currentC
The inverse proportionality between voltage and resistanceD
The inverse proportionality between current and resistanceClick an option to check your answer
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