Multiple Choice Questions

Electricity

Updated for CBSE 2027
Board Exam Preparation
120+ Practice Questions
Notes

Practice Questions with Answers

Total 120 questions available

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Q. 1
The household circuits are connected in:
A
series
B
parallel
C
both series and parallel
D
neither series nor parallel
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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.
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Q. 3
Who first established Ohm's law?
A
George Simon Ohm
B
Michael Faraday
C
Thomas Edison
D
Nikola Tesla
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Q. 4
A neutral body has equal amount of :
A
Both positive and negative charges
B
Only positive charge
C
Only negative charge
D
No charge at all
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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
0.0423611111111111
B
0.0840277777777778
C
0.0430555555555556
D
0.167361111111111
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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
40Ω
B
400Ω
C
0.4 Ω
D
4Ω
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Q. 7
What does resistivity refer to in terms of a conductor?
A
Its resistance per unit area
B
Its resistance per unit length
C
Its ability to conduct electricity
D
Its ability to generate electric charge
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Q. 8
Three equal resistances when combined in series are equivalent to 90w. Their equivalent resistance when combined in parallel will be
A
810 W
B
10 W
C
270 W
D
30 W
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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
1016
B
1018
C
1023
D
1020
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Q. 10
Electricity constituted by moving electric charges, is called :
A
positive electricity
B
static electricity
C
current electricity
D
negative electricity
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Q. 11
Potential difference in a circuit in which components are connected in series
A
Gets divided across each component
B
Potential difference does not appear
C
Gets distributed equally
D
Remains the same across each component
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Q. 12
All the following statements are correct except :
A
The presence of moisture in the air reduces its conductivity
B
None of the above
C
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.
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Q. 13
Electron volt is a measure of :
A
energy
B
charge
C
current
D
electric potential
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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
54J
B
50J
C
24 J
D
48J
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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 kilojoules
B
80 kilojoules
C
60 kilojoules
D
40 kilojoules
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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
more
B
less
C
double
D
same
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Q. 17
What does the slope of a V-I (voltage-current) graph represent?
A
Power
B
Charge
C
Resistance
D
Reciprocal of resistance
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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
6Ω
B
15Ω
C
3Ω
D
1Ω
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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
20J
B
5J
C
40J
D
10J
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Q. 20
Commercial unit of electrical energy is :
A
Kilowatt hour
B
Calorie
C
All of these
D
Joule
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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 wire
B
Will be more in thicker wire
C
Cannot be predicted
D
Will be same in both
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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 / 4
B
E = 0
C
E
D
4 E
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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.
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Q. 24
There is a dual of 8 ohm resistance on the aerial. Determine the aerial's new resistance.
A
2Ω
B
10 Ω
C
4Ω
D
ΖΩ
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Q. 25
How does resistivity relate to the resistance of a material?
A
They are the same thing
B
They are directly proportional
C
They are inversely proportional
D
They have no relationshi
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Q. 26
The instrument used for measuring electric current is:
A
voltmeter
B
galvanometer
C
ammeter
D
potentiometer
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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 W
B
50 W
C
75W
D
100 W
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Q. 28
A 2 KW boiler used for 1 hour everyday consumes the following electrical energy in thirty days :
A
120 units
B
15 units
C
None of these
D
60 units
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Q. 29
Electrical resistivity of a given metallic wire depends upon:
A
its shape
B
its length
C
nature of the material
D
its thickness
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Q. 30
What happens to the current flowing through each resistor in a parallel connection?
A
It remains the same
B
It decreases
C
It increases
D
It varies
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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) increases
B
V and R remain the same
C
Potential difference (V) decreases
D
Resistance (R) decreases
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Q. 32
If a lamp has a power of 60 watts, how much energy does it dissipate in one minute?
A
360 joules
B
36 joules
C
3.6 joules
D
3600 joules
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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 half
B
It doubles
C
It becomes four times
D
It remains the same
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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
1/5
B
1 /25
C
25
D
5
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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 Ω
B
40 Ω
C
20 Ω
D
10Ω
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Q. 36
How is resistivity commonly represented?
A
Ω (ohm)
B
m (meter)
C
A (ampere)
D
p (Greek letter)
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Q. 37
What is resistivity?
A
The ability of a material to conduct electricity
B
The resistance of a material to electric current
C
The inverse of electrical conductivity
D
The measure of electric charge
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Q. 38
Unit of potential difference is :
A
Coulomb
B
Joule/Coulomb
C
Volt
D
(a) and (b) are correct
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Q. 39
What is the SI unit of electrical resistivity?
A
Ohm (Ω)
B
Meter (m)
C
Ohm-meter (Ω·m)
D
Ampere (A)
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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 decreases
B
It remains constant
C
It increases
D
It becomes zero
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Q. 41
The resistance of the wire when the length of the wire increases two times
A
Becomes 4 times
B
Becomes 2 times
C
Becomes 3 times
D
Becomes 6 times
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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
Insulators
B
Superconductors
C
Resistors
D
Non-Ohmic materials"
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Q. 43
The values of mA and uA are :
A
10-3 and 10-6 A respectively
B
10-3 and 10-⁹ A respectively
C
10-6 and 10-3 A respectively
D
106 and 10-⁹ A respectively
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Q. 44
When there is an electric current passing through a wire, the particles moving are
A
Ions
B
Electrons
C
Protons
D
Atoms
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Q. 45
The slope of voltage (V) versus current (I) curve is called :
A
Conductivity
B
Resistance
C
Conductance
D
Resistivity
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Q. 46
Ohms law relates potential difference with
A
Time
B
Power
C
Energy
D
Current
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Q. 47
The device used for measuring potential difference is known as ?
A
Potentiometer
B
Voltmeter
C
Galvanometer
D
Ammeter
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Q. 48
Watt hour is also called :
A
Board of trade unit
B
volt-ampere hour (VAH)
C
None of these
D
Horse power
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Q. 49
For commercial purposes, what unit is commonly used to measure electrical energy?
A
Watt-hour
B
Kilowatt-hour
C
Megajoule
D
Gigawatt
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Q. 50
The resistivity does not change if
A
the temperature is changed
B
the material is changed
C
both material and temperature are changed
D
the shape of the resistor is changed
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Q. 51
The work done in moving a unit positive charge across two points inan electric circuit is a measure of ?
A
Power
B
Resistance
C
Potential difference
D
Current
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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 series
B
Both ammeter and voltmeter in series
C
ammeter in series and voltmeter in parallel
D
Both ammeter and voltmeter in parallel
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Q. 53
On which of the given factors, resistance does not depend:
A
temperature
B
density
C
length of conductor
D
area of cross-section
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Q. 54
What does a low resistivity indicate about a material?
A
It conducts electric current readily
B
It resists electric current strongly
C
It has high electrical resistance
D
It is a poor conductor of electricity
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Q. 55
The space around a charge in which some other charge experiences attraction or repulsion, is called its:
A
Electric field
B
Electric field intensity
C
Potential difference
D
Potential
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Q. 56
The path of a free electron in a metal is-
A
Parabolic
B
Circular
C
Zig zag
D
A straight line
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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.
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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 Ω
B
25 Ω
C
30 Ω
D
60 Ω
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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 A
B
2A
C
3 A
D
0.5 A
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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 A
B
0.8 A
C
0.4 A
D
0.6 A
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Q. 61
In a parallel connection, how is the total resistance calculated?
A
By adding individual resistances
B
By multiplying individual resistances
C
By dividing individual resistances
D
By subtracting individual resistances
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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.
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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 voltmeter
B
Connect voltmeter in series
C
decrease resistance with the help of rheostat
D
Get the voltmeter replaced
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Q. 64
For which of the following substances, resistance decreases with temperature
A
Copper
B
Carbon
C
Mercury
D
Platinum
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Q. 65
The amount of heat energy produced in 5 minutes by an electric heater rated at 1000 W is
A
2 × 105 J
B
4 × 105 J
C
300 J
D
3 × 105 J
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Q. 66
The resistivity of a wire depends on
A
Material
B
Length
C
Length, material and area of cross section
D
Area of cross section
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Q. 67
What factor does resistivity take into account in its measurement?
A
Material's mass
B
Material's temperature
C
Material's volume
D
Material's color
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Q. 68
Resistance of the wire is given by
A
R= IV
B
R= I2V
C
R= I/V
D
R= V/I
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Q. 69
Which of the following is an ohmic resistor
A
Diode
B
Nichrome
C
Diamond
D
Germanium
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Q. 70
In a voltmeter there are 20 divisions between 0 to 0.5 the least count of voltmeter is
A
0.050
B
0.0020
C
0.250
D
0.025
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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 J
B
15 J
C
30 J
D
60 J
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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 V
B
6.8 V
C
15.9 V
D
17.1 V
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Q. 73
An battery is used to
A
Safeguard against short - circuit
B
Measure electric potential
C
Maintain a potential difference
D
Measure electric current
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Q. 74
At the time of short circuit, the electric current in the circuit:
A
increases heavily
B
vary continuously
C
does not change
D
reduces substantially
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Q. 75
Which type of connection ensures that the current flowing through each resistor remains the same?
A
Series connection
B
Parallel connection
C
Both a and b
D
Neither a nor b
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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 joules
B
1 kilowatt-hour is equal to 3.6 million joules
C
1 joule is equal to 3.6 kilowatt-hours
D
1 joule is equal to 3.6 × 10^-6 kilowatt-hours
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Q. 77
In a series connection, how is the total resistance calculated?
A
By subtracting individual resistances
B
By adding individual resistances
C
By multiplying individual resistances
D
By dividing individual resistances
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Q. 78
What happens to the total resistance when resistors are connected in series?
A
It increases
B
It decreases
C
It remains the same
D
It varies
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Q. 79
Which property does resistivity measure?
A
The ability to store electrical charge
B
The ability to conduct heat
C
The ability to resist or conduct electric current
D
The ability to generate magnetic fields
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Q. 80
An electric fuse is connected with :
A
neutral wire
B
live wire
C
parallel to the line wire
D
earthing
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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
600c
B
500C
C
300C
D
400C
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Q. 82
How many joules are equivalent to 1 kilowatt-hour of electrical energy?
A
3.6 × 10^6
B
1 × 10^3
C
3.6 × 10^3
D
1 × 10^6
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Q. 83
Why is using joules impractical for measuring large quantities of electrical energy?
A
Joules are not a standard unit
B
Joules are inconvenient to calculate
C
Joules are too large a unit
D
Joules are too small a unit
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Q. 84
Which of the following obeys Ohm's law ?
A
Transistor
B
Filament of a bulb
C
LED
D
Nichrome
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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 end
B
Work is done in moving a charge
C
Potential difference
D
All of the above
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Q. 86
Joule/Coulomb is same as ?
A
Watt
B
Volt
C
Ampere
D
Ohm
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Q. 87
In a series connection of resistors, how do potential differences across each resistor behave?
A
They remain the same
B
They decrease
C
They increase
D
They vary
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Q. 88
The current in a wire
A
Does not depend on resistance and potential difference
B
Depends only on the resistance of the wire
C
Depends only on the potential difference applied
D
Depends on both resistance and potential difference
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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 V
B
1V
C
4 V
D
8V
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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
half
B
one - fourth
C
four times
D
two times
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Q. 91
Substances whose atoms have more free electrons are called :
A
Electrolytes
B
Semi-conductors
C
Conductors
D
Insulators
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Q. 92
The resistance of the wire when the length of the wire increases two times :
A
becomes 6 times
B
becomes 3 times
C
becomes 4 times
D
becomes 2 times
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Q. 93
Electric current is :
A
work done per unit time
B
Resistance per unit time
C
All of these
D
flow of charge per unit time
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Q. 94
What is the SI unit of electrical energy?
A
Watt
B
Volt
C
Joule
D
Kilowatt-hour
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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 ohms
B
0.9 ohms
C
9 ohms
D
900 ohms
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Q. 96
What is not true for electric charge :
A
S.I. unit of charge is coulomb
B
One coulomb is charge of one electron
C
Charge on a body may be + ve or – ve
D
Electric charge is scalar quantity
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Q. 97
The resistivity of alloys is:
A
verylow
B
very high
C
generally lower than its constituent metals
D
more than resistivity of insulators
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Q. 98
A positive charge released from rest
A
Moves towards the regions of equal potential
B
Does not move
C
Moves towards the regions of lower potentia
D
Moves towards the regions of higher potential
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Q. 99
When resistors are connected in parallel, what remains constant across each resistor?
A
Current
B
Resistance
C
Voltage
D
Power
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Q. 100
Unit of electric power may also be expressed as:
A
kilowatt-hour
B
watt-second
C
joule-second
D
volt-ampere
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Q. 101
What is immaterial for an electric fuse wire?
A
Its length
B
Current flowing through it
C
Its radius
D
Its specific resistance
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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
1/4
B
21
C
1/2
D
41
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Q. 103
A sure test of electrification is :
A
Repulsion
B
Friction
C
Induction
D
Attraction
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Q. 104
What happens to the total resistance when resistors are connected in parallel?
A
It increases
B
It decreases
C
It remains the same
D
It varies
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Q. 105
Work done in moving a unit positive test charge from one point to another inside an electric field, is called:
A
Potential difference
B
Field intensity
C
Field
D
Potential
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Q. 106
Which class of materials is known to generally follow Ohm's law?
A
Insulators
B
Superconductors
C
Semiconductors
D
Metallic conductors
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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
1:4
B
4:1
C
2:1
D
1:2
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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°C
B
597°C
C
512°C
D
583°C
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Q. 109
The values of mA and μA are:
A
10–3 and 10–6 A respectively
B
10–3 and 10–9 A respectively
C
10–6 and 10–3 A respectively
D
10–6 and 10–9 A respectively
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Q. 110
How is the electrical energy consumed by an appliance calculated?
A
By multiplying its voltage and current
B
By dividing its power by the duration of use
C
By adding its power and duration of use
D
By multiplying its power rating and duration of use
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Q. 111
Law which gives force between two charges is :
A
None of these
B
Coulomb’s law
C
Faraday’s Law
D
Ohm’s law
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Q. 112
Electric fuse is connected with:
A
neutral wire
B
parallel to the line wire
C
earthing
D
Live wire
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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 series
B
Both ammeter and voltmeter in parallel
C
Ammeter in parallel and voltmeter in series
D
Ammeter in series and voltmeter in parallel
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Q. 114
5 C/S is same as :
A
5 volt
B
5 joule
C
5 A
D
5 mA
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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
Current
C
Potential difference
D
(a) & (c) both are correct
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Q. 116
Electrical resistivity of a given metallic wire depends upon:
A
Nature of the material
B
Its length
C
Its thickness
D
Its shape
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Q. 117
A body gets positively charged by loosing :
A
Protons
B
α -particles
C
Electrons
D
Neutrons
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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 times
B
256 times
C
four times
D
eight times
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Q. 119
What does the constant ""k"" represent in Ohm's law equation?
A
Resistance offered by the conductor
B
Current flowing through the conductor
C
Voltage applied
D
Conductivity of the material
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Q. 120
What is the relationship established by Ohm's law?
A
The direct proportionality between current and resistance
B
The direct proportionality between voltage and current
C
The inverse proportionality between voltage and resistance
D
The inverse proportionality between current and resistance
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