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mcq on Current Electricity with Solution PDF for Students
An electric iron requires a safety fuse to avoid short circuits. The correct fuse rating is:
a) 2 A
b) 5 A
c) 4 A
d) 3 A
Option d – 3 A
The SI unit for measuring electric current is:
a) Ohm
b) Ampere
c) Metre
d) Volt
Option b – Ampere
The standard unit of specific resistance is:
a) Ohm metre
b) Farad
c) Coulomb
d) Ampere
Option a – Ohm metre
Before a five-day trip, Mr. Patel provided students with flashlights and extra batteries. He asked how the batteries generate Electricity. The accurate explanation is:
a) chemical reactions inside the battery create Electricity.
b) Friction between the battery and the flashlight produces Electricity.
c) Electricity is stored in the battery during manufacturing.
d) The battery draws Electricity from the surroundings.
Option a – chemical reactions inside the battery create Electricity.
Which situation cannot lead to electrical overloading?
a) Using many devices on a single socket.
b) A sudden rise in supply voltage.
c) Direct contact between live and neutral wires.
d) Contact of live and neutral wires through high resistance.
Option d – Contact of live and neutral wires through high resistance.
The SI unit named after Charles Augustin Coulomb measures:
b) Electric current density
d) Electric power
Option c – electric charge
The Greek symbol “Ω” represents:
a) Electric potential difference
b) Electric displacement field
c) Electrical conductance
d) Electrical resistance
Option d – Electrical resistance
One milliampere equals:
a) 0.001 A
b) 0.01 A
c) 0.0001 A
d) 0.00001 A
Option a – 0.001 A
Why is touching an electrical switchboard with wet hands unsafe?
a) Water can damage the switchboard surface.
b) Water and the human body together conduct Electricity well.
c) Wet hands can remove the paint on the switchboard.
d) Wet hands may slip off the switch.
Option b – Water and the human body together conduct electricity well.
Meera found one of her newly installed bulbs didn’t Light because it was fused. The cause was:
a) The switch was off.
b) The bulb was not properly fixed.
c) The filament inside the bulb was broken.
d) No connection existed between the holder and the switch.
Option c – The filament inside the bulb was broken.
The SI unit of electric current is:
a) Watt
b) Volt
c) Ohm
d) Ampere
Option d – Ampere
Which equation correctly defines one ampere?
a) A = 1 C/s
b) C = A × 2 s
c) A = 2 C/s
d) C = A/2 s
Option a – A = 1 C/s
Which component is used to change resistance in an electrical circuit?
a) Ammeter
b) Voltmeter
c) Rheostat
d) Conductor
Option c – Rheostat
Identify the incorrect pairing of scientist and discovery:
a) Albert Einstein – Photoelectric effect explanation
b) Galileo Galilei – wave theory of Light
c) Heinrich Hertz – Discovery of electromagnetic waves
d) Michael Faraday – Laws of electromagnetic induction
The Greek letter ρ (rho) commonly denotes:
a) Electrical conductivity
b) Electric current
c) Electrical resistivity
d) Flow of electric charge
Option c – Electrical resistivity
Coulomb’s law is valid:
a) Between two point charges
b) Between two distributed charges
c) For both point and distributed charges
d) For neither point nor distributed charges
Option a – Between two point charges
Who is famous for the gold foil experiment?
a) John Dalton
b) J.J. Thomson
c) Niels Bohr
d) Ernest Rutherford
Option d – Ernest Rutherford
One unit of household electrical energy equals:
a) Kilowatt-hour
b) Milliampere-hour
c) Kilojoule-hour
d) Kilovolt-ampere-hour
Option a – Kilowatt-hour
Four identical resistors of resistance R are combined in series/parallel. Which total resistance is not possible?
a) 0.25 R
b) 1.33 R
c) 2 R
d) 2.5 R
Option d – 2.5 R
Which law describes the attractive or repulsive force between two point charges?
a) Kirchhoff’s Law
b) Newton’s Universal Law of Gravitation
c) Coulomb’s Law
d) Newton’s Laws of motion
Option c – Coulomb’s Law
Choose the accurate statement about the definition of an ampere.
a) One ampere equals the movement of one coulomb of charge each minute.
b) One ampere equals the flow of two coulombs of charge per second.
c) One ampere equals the flow of one coulomb of charge per second.
d) One ampere equals the movement of half a coulomb of charge per second.
Option c – One ampere equals the flow of one coulomb of charge per second.
Under what condition do electrons move to create current in a metal wire?
a) When no electric pressure difference exists
b) When charge flow has stopped
c) Only when there is an electric pressure difference
d) Due to gravitational force
Option c – Only when there is an electric pressure difference
What occurs to the current in a resistor when its resistance is doubled?
a) Current becomes three times larger
b) Current is reduced to half
c) Current is doubled
d) Current ceases completely
Option b – Current is reduced to half
In an electric cell symbol, what does the thicker, shorter line represent?
a) Ring terminal
b) Positive terminal
c) Negative terminal
d) Neutral terminal
Option b – Positive terminal
Which material listed below is a poor conductor of electricity?
a) Gold
b) Graphite
c) Soil
d) Diamond
Option d – Diamond
Who first proposed the idea of an Electric Field?
a) Blaise Pascal
b) Michael Faraday
c) Charles Augustin de Coulomb
d) Joseph Henry
Option b – Michael Faraday
What is the NET charge of an electric dipole?
a) –1
b) +1
c) 0
d) 10
Option c – 0
Electronic conductance in Metals: how does it vary with temperature?
a) Decreases as temperature increases
b) Increases as temperature increases
c) Decreases as temperature decreases
d) Remains unaffected by temperature
Option a – Decreases as temperature increases
Which formula correctly represents potential difference between two points?
a) Q = 1 / W
b) W = Q / V
c) V = Q / W
d) V = W / Q
Option d – V = W / Q
Who, in 1827, established the formula relating current, resistance, and voltage?
a) William Gilbert
b) William Watson
c) Gustav Kirchhoff
d) Georg Simon Ohm
Option d – Georg Simon Ohm
In 1785, who measured the force between electric charges using a torsion balance?
a) R.A. Millikan
b) Hans Christian Oersted
c) Charles Augustin de Coulomb
d) John Michell
Option c – Charles Augustin de Coulomb
Which scientist discovered superconductivity and received the 1911 Physics Nobel Prize?
a) Robert Bunsen
b) Johannes Diderik van der Waals
c) Heike Kamerlingh Onnes
d) Gustav Kirchhoff
Option c – Heike Kamerlingh Onnes
Which unit represents a field intensity that generates one newton of force per ampere per meter?
a) Candela
b) Coulomb
c) Tesla
d) Pascal
Option c – Tesla
How should a voltmeter be connected to measure potential difference?
a) Along the same magnetic field
b) In parallel
c) In concentric circles
d) Perpendicular to the field
Option b – In parallel
One weber per second is equal to which unit?
a) Volt
b) Coulomb
c) Ohm
d) Ampere
Option a – Volt
‘Mho’ is the measurement unit for:
a) Conductance
b) Resistivity
c) Resistance
d) Conductivity
Option a – Conductance
What is the standard initial voltage of an AA battery used in small home appliances?
a) 2.0 V
b) 1.5 V
c) 3.0 V
d) 2.5 V
Option b – 1.5 V
Which equation, derived in 1928, merges quantum theory and special relativity for electrons at high speed?
a) Lorentz equation
b) Bernoulli’s equation
c) Dirac equation
d) Helmholtz equation
Option c – Dirac equation
If a 1.5 A current flows through a lamp for 10 ms, how much charge moves through it?
a) 0.015 C
b) 0.15 C
c) 1.5 C
d) 15 C
Option a – 0.015 C
Which device transforms mechanical energy into electrical energy?
a) Voltmeter
b) Ammeter
c) Generator
d) Motor
Option c – Generator
In an electric circuit, a wire with a resistance of 10 Ω is stretched to twice its original length. What happens to the current in the circuit?
a) It becomes half of its initial value.
b) It becomes double its initial value.
c) It becomes one-fourth of its initial value.
d) It becomes four times its initial value.
Option c – It becomes one-fourth of its initial value.
An electric bulb is rated 220 V and 80 W. When operated at 110 V, its power consumption will be:
a) 80 W
b) 60 W
c) 40 W
d) 20 W
Option d – 20 W
Which statements about the electrical resistance and resistivity of a wire are correct? 1. Both depend on the wire’s cross-sectional area. 2. Both depend on temperature. 3. Resistance is directly proportional to the wire’s resistivity. 4. Resistivity is directly proportional to the wire’s length. Select the correct option:
a) 1 and 2
b) 1 and 3
c) 2 and 3
d) 2 and 4
Option c – 2 and 3
A beam of positive and negative charges passes at high speed through a magnetic field perpendicular to their motion (without recombination). What will occur?
a) Both types of charges will stop moving.
b) Positive and negative charges will separate.
c) Positive charges stop while negative charges continue moving.
d) Both positive and negative charges continue moving without interruption.
Option b – Positive and negative charges will separate.
A direct-current machine carries 15 A for 10 minutes. What total charge flows through it in that time?
a) 1.50 C
b) 150 C
c) 900 C
d) 9000 C
Option d – 9000 C
Which particles primarily conduct electric current in a metal?
a) Bound electrons
b) Free electrons
c) Both bound and free electrons
d) Ions
Option b – Free electrons
An incandescent bulb converts 20 % of its power into Light. Its filament has a resistance of 200 Ω and a current of 2 A flows through it. If it remains ON for 10 hours and electricity costs ₹5 per unit, how much Money is spent on producing Light?
a) ₹75
b) ₹76
c) ₹77
d) ₹78
Option d – ₹78
Two resistors of 5 Ω and 7 Ω are connected in series and this combination is placed in parallel with a 36 Ω resistor. What is the total equivalent resistance?
a) 24 Ω
b) 12 Ω
c) 9 Ω
d) 6 Ω
Option c – 9 Ω
A Light bulb rated 60 W at 220 V has a potential difference of 110 V across its terminals. How much power is dissipated?
a) 45 W
b) 30 W
c) 15 W
d) 2 W
Option c – 15 W
Four identical resistors of 4 Ω are connected in parallel. What is the overall resistance?
a) 16 Ω
b) 10 Ω
c) 1 Ω
d) 4 Ω
Option c – 1 Ω
Who introduced the celebrated equation E = mc² in 1905?
a) Isaac Newton
b) Albert Einstein
c) Ernest Rutherford
d) Werner Heisenberg
Option b – Albert Einstein
In an electric circuit, if the wire’s length is doubled, to what fraction will the ammeter reading drop?
a) One-third
b) One-fourth
c) One-half
d) One-sixth
Option c – One-half
Which instrument is designed to accelerate charged particles to very high speeds?
a) Cyclotron
b) Copatron
c) Cosmotron
d) Cryotron
Option a – Cyclotron
For which achievement in 1827 is the German scientist Georg Simon Ohm most recognized?
a) Creating a device to amplify and modulate electromagnetic signals that also works as an oscillator
b) Inventing a magnetometer to measure the direction and strength of a magnetic field
c) Measuring magnetic properties of atomic nuclei
d) Establishing the mathematical relationship between electric current, voltage, and resistance
Option d – Establishing the mathematical relationship between electric current, voltage, and resistance
The formula published by Georg Simon Ohm in 1827 describes which concept?
a) The total current entering a junction equals the total current leaving it
b) The total electric flux through a closed surface is proportional to the enclosed charge
c) Current is directly proportional to potential difference and inversely proportional to resistance
d) The induced EMF in a coil is proportional to the rate of change of magnetic flux
Option c – Current is directly proportional to potential difference and inversely proportional to resistance
Watt is the SI unit of
a) Momentum
b) Resistance
c) energy
d) power
Option d – power
Which material has the greatest electrical resistivity?
a) Silver
b) Nichrome
c) Chromium
d) Iron
Option b – Nichrome
Who, in 1834, stated the law that the induced current always opposes the change causing it? ( mcq on Current Electricity with Solution PDF )
a) David Brewster
b) Henry Moseley
c) Christian Johann Doppler
d) Heinrich Friedrich Lenz
Option d – Heinrich Friedrich Lenz
Which statement accurately reflects Coulomb’s law? ( mcq on Current Electricity with Solution PDF )
a) Applies to both point charges and distributed charges
b) Applies only to distributed charges
c) Applies only to point charges
d) Applies to neither point nor distributed charges
Option c – Applies only to point charges
The number of electrons corresponding to a 1 A current is ( mcq on Current Electricity with Solution PDF )
a) 6.25 × 10²
b) 6.25 × 10¹⁸
c) 6.25 × 10¹⁰
d) 6.25 × 10⁵
Option b – 6.25 × 10¹⁸
If resistors of 3 Ω, 4 Ω, 5 Ω, and 6 Ω are connected in series, what is their total resistance? ( mcq on Current Electricity with Solution PDF )
a) 30 Ω
b) 90 Ω
c) 18 Ω
d) 100 Ω
Option c – 18 Ω
Which of these substances is an excellent conductor of electricity? ( mcq on Current Electricity with Solution PDF )
a) Silver
b) Glass
c) Mica
d) Ebonite
Option a – Silver
Which device is used to open or close an electric circuit? ( mcq on Current Electricity with Solution PDF )
a) Insulator
b) Wires
c) Switch
d) Bulb
Option c – Switch
Choose the correct statement. ( mcq on Current Electricity with Solution PDF )
a) The resistance of a wire depends on its length and density
b) Specific resistance is identical for all conductors
c) The resistance of a wire depends on its length and cross-sectional area
d) Specific resistance varies with the wire’s cross-section
Option c – The resistance of a wire depends on its length and cross-sectional area
A bulb connected to an 18 V battery draws 3 A. What is the resistance of the bulb? ( MCQ on Current Electricity with Solution PDF )
a) 6 Ω
b) 2 Ω
c) 4 Ω
d) 3 Ω
Option a – 6 Ω
If Q is total charge and t is time, which relation is correct? ( MCQ on Current Electricity with Solution PDF )
a) I = Q × t
b) T = Q × I
c) Q = I / t
d) I = Q / t
Option d – I = Q / t
Whose law states that the current entering a junction equals the current leaving it? ( MCQ on Current Electricity with Solution PDF )
a) Michael Faraday
b) Georg Simon Ohm
c) Gustav Robert Kirchhoff
d) Victor Francis Hess
Option c – Gustav Robert Kirchhoff
A Wheatstone bridge is a Network of how many resistors for precise resistance measurement? ( MCQ on Current Electricity with Solution PDF )
a) Three
b) Four
c) Five
d) Six
Option b – Four
Which statement about fuse wire is accurate?
a) Low melting point and low conductivity
b) High melting point and low conductivity
c) Low melting point and high conductivity
d) High melting point and high conductivity
Option c – Low melting point and high conductivity
Why do atoms and non-polar molecules lack a dipole moment?
a) Their electronic charge cloud is absent
b) Their electronic charge cloud is scattered
c) Their electronic charge cloud is asymmetrically distributed
d) Their electronic charge cloud is symmetrically distributed
Option d – Their electronic charge cloud is symmetrically distributed
How much work is done when a 4 C charge moves across a potential difference of 6 V?
a) 48 J
b) 12 J
c) 36 J
d) 24 J
Option d – 24 J
What is the coiled wire inside an electric room heater called?
a) Cell
b) Fuse
c) Switch
d) Element
Option d – Element
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