NEET Physics: Current Electricity Practice Questions
14 free multiple-choice questions on Current Electricity for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more Current Electricity questions in the app →Q1. In a series circuit, if the total resistance increases, the total current flowing through the circuit will:
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Correct answer: B — Decrease
According to Ohm's Law (I = V/R), if the voltage (V) remains constant, an increase in total resistance (R) will result in a decrease in the total current (I).
Q2. If the potential difference across a resistor is doubled, and the temperature remains constant, the current flowing through it will:
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Correct answer: A — Double
According to Ohm's law (V=IR), if V is doubled and R is constant, I must also double.
Q3. A circuit consists of two batteries and three resistors. If we apply Kirchhoff's Voltage Law (KVL) to a closed loop, what principle does it govern?
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Correct answer: D — Conservation of Energy
KVL is based on the principle of conservation of energy, stating that the algebraic sum of potential differences (voltage drops and rises) around any closed loop must be zero.
Q4. If the currents entering a junction are 5A and 3A, and the current leaving is 8A, what is the net current entering that junction? (Using KCL)
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Correct answer: A — 2A
KCL requires ΣIᵢₙ = ΣIₒᵤₜ. If 5A + 3A = 8A, then the net current entering is 8A - (5A + 3A) = 0A. If we consider only the flow into the junction, the balance equation is Iᵢₙ = Iₒᵤₜ, so Iᵢₙ = 8A. If the question asks for the net input current, it is the difference between input and output flow, or simply the total current flowing through the junction if input equals output. Assuming the standard KCL formulation: Input current = 8A.
Q5. Which of the following physical quantities represents the opposition offered by a conductor to the flow of electric current?
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Correct answer: A — Resistance
Resistance is the property of a material that opposes the flow of electric current. It is measured in Ohms (Ω).
Q6. The Wheatstone bridge is a circuit used primarily to experimentally determine:
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Correct answer: B — Resistance
The Wheatstone bridge is a circuit used to find an unknown resistance by balancing the bridge, which relies on the principle that the ratio of resistances is equal.
Q7. In a simple series circuit containing three resistors R₁, R₂, and R₃, if the total equivalent resistance R₍eq) is 50 Ω, and R₁ and R₂ are in series with R₃, what is the relationship between the resistances?
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Correct answer: D — R₍eq) = R₁ + R₂ + R₃
In a series circuit, the total equivalent resistance is the sum of the individual resistances. R₍eq) = R₁ + R₂ + R₃.
Q8. In an ohmic conductor, the relationship between potential difference (V), current (I), and resistance (R) is described by which fundamental law?
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Correct answer: A — Ohm's Law
Ohm's Law states that the potential difference across a conductor is directly proportional to the current flowing through it when the temperature remains constant (V=IR).
Q9. When resistors are connected in series, what remains the same throughout the circuit?
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Correct answer: C — The total current
In a series circuit, the current is the same throughout, but the total resistance is the sum of individual resistances. The total potential difference depends on the source and the total resistance.
Q10. In a series circuit, what property remains constant for all components when a total current flows through them?
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Correct answer: D — Current
In a series circuit, the current is the same throughout the entire circuit. The potential difference (voltage) is divided among the resistors.
Q11. The relationship between electric current (I), potential difference (V), and resistance (R) is governed by which fundamental law?
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Correct answer: C — Ohm's Law
Ohm's Law states that the current flowing through a conductor is directly proportional to the potential difference across its ends, provided the temperature and material remain constant (V=IR).
Q12. Which law is used to determine the relationship between the voltages and currents in a closed loop circuit?
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Correct answer: D — Kirchhoff's Second Law
Kirchhoff's Second Law (KVL) states that the algebraic sum of the potential differences (voltage drops) around any closed loop in a circuit is zero.
Q13. In a parallel circuit, the total equivalent resistance is calculated by:
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Correct answer: B — Taking the reciprocal of the sum of the reciprocals of individual resistances
For resistors in parallel, the reciprocal of the total resistance is the sum of the reciprocals of individual resistances: 1/R₍eq) = 1/R₁ + 1/R₂ + ….
Q14. Which statement is fundamentally based on the principle of conservation of energy in an electrical circuit, as defined by Kirchhoff's Voltage Law (KVL)?
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Correct answer: B — The algebraic sum of potential differences around any closed loop is zero.
Kirchhoff's Voltage Law (KVL) states that the algebraic sum of potential differences (voltage drops) around any closed loop in a circuit is zero, which is a direct application of the conservation of energy principle.
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