Class 10 • Physics • Chapter 11
Electricity
True & False Quiz
Charge. Resist. Power.
✓True
✗False
25
Questions
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Ch.11
Chapter
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X
Class
Why True & False for Electricity?
How this format sharpens your conceptual clarity
🔵 Electricity is the backbone of modern technology — Ohm's law, resistance, and power calculations appear in engineering, physics, and daily life.
✅ T/F targets Ohm's law, series vs parallel circuits, resistance formulae, heating effect, and electric power.
🎯 In a parallel circuit, adding more resistors DECREASES total resistance — opposite of what students expect.
📋
Read each statement carefully. Click True or False — instant feedback with explanation appears. Submit anytime; unattempted questions are marked Skipped.
Q 1
Electric current in a conductor is defined as the rate of flow of electric charge through its cross-section.
Q 2
The SI unit of electric current is volt.
Q 3
In a metallic conductor, electric current is due to the flow of electrons.
Q 4
Potential difference between two points in a circuit is the work done per unit charge in moving a test charge between them.
Q 5
The SI unit of potential difference is joule per coulomb, which is also called volt.
Q 6
In a simple electric circuit, an ammeter is always connected in parallel with the component whose current is to be measured.
Q 7
A voltmeter is connected in parallel across a resistor to measure the potential difference across it.
Q 8
Ohm’s law states that at constant temperature, the potential difference across a conductor is directly proportional to the current flowing through it.
Q 9
In the V–I graph of an ohmic conductor, the graph between potential difference and current is a curved line passing through the origin.
Q 10
The resistance of a conductor is defined as the ratio of potential difference across it to the current flowing through it.
Q 11
The SI unit of resistance is ohm, which is equal to volt per ampere.
Q 12
Resistivity of a material depends on the length and area of cross-section of the conductor made of that material.
Q 13
The SI unit of resistivity is ohm metre.
Q 14
The equivalent resistance of resistors connected in series is equal to the sum of their individual resistances.
Q 15
When resistors are connected in parallel, the same current flows through each resistor.
Q 16
For resistors in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of individual resistances.
Q 17
In a series combination of resistors, the total current in the circuit is equal to the sum of currents through each resistor.
Q 18
When the number of resistors in series increases, the total resistance of the circuit decreases.
Q 19
When additional resistors are connected in parallel to a circuit, the total resistance of the circuit decreases.
Q 20
The heating effect of electric current in a resistor depends only on the resistance, not on the current flowing through it.
Q 21
An electric fuse is a safety device that works on the heating effect of electric current.
Q 22
A good fuse wire must have a low melting point and high resistivity.
Q 23
Electric power is defined as the rate at which electrical energy is consumed or converted into another form.
Q 24
The SI unit of electric power is kilowatt-hour.
Q 25
For a given resistance, electric power consumed by a device increases when the potential difference applied across it increases.
Key Takeaways — Electricity
Core facts for CBSE Boards & exams
1
Ohm's Law: V = IR (valid when temperature is constant).
2
Series: Rᵗᵢᵗᵀᴸ = R₁ + R₂ + R₃; current same through all.
3
Parallel: 1/Rᵗᵢᵗᵀᴸ = 1/R₁ + 1/R₂ + 1/R₃; voltage same across all.
4
Electric Power P = VI = I²R = V²/R; unit = Watt (W).
5
Heating effect: H = I²Rt (Joule's Law); used in heaters, bulbs, fuses.
6
1 kWh = 1 unit of electricity = 3.6 × 10⁶ J.