Electric Current and Ohm’s Law Questions with Answers | Page 2

Electric Current and Ohm’s Law questions with answers are among the most common electronics aptitude questions in GATE, SSC JE, and RRB JE exams. This topic explains the fundamental relationship between voltage, current, and resistance — the backbone of electrical circuit analysis. Understanding Ohm’s Law and its applications helps solve both theoretical and numerical questions efficiently. Here, you’ll find well-explained problems covering resistivity, conductance, and real-world circuit examples to improve your technical proficiency.

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Q11

The reciprocal of resistance is known as

A A) Capacitance
B B) Resistivity
C C) Conductance
D D) Inductance

Answer: Option C

Explanation: Conductance (G) is the reciprocal of resistance (G = 1/R) and measures how easily current flows through a material.

Q12

The SI unit of conductance is

A A) Siemens
B B) Ohm
C C) Henry
D D) Farad

Answer: Option A

Explanation: Conductance is measured in siemens (S), which is the reciprocal of ohm (1 S = 1 Ω⁻¹).

Q13

When the temperature of a metallic conductor increases, its resistance

A A) Decreases
B B) Increases
C C) Remains constant
D D) Becomes zero

Answer: Option B

Explanation: For most metallic conductors, resistance increases with temperature due to increased atomic vibrations that impede electron flow.

Q14

The resistance of an ideal conductor is

A A) Zero
B B) One
C C) Infinite
D D) Very high

Answer: Option A

Explanation: An ideal conductor has zero resistance, allowing current to flow without any energy loss.

Q15

The resistance of an ideal insulator is

A A) Zero
B B) Low
C C) Infinite
D D) Moderate

Answer: Option C

Explanation: An ideal insulator has infinite resistance, completely preventing the flow of electric current.

Q16

The total resistance of resistors in series is

A A) Less than smallest resistor
B B) Product divided by sum
C C) Sum of all resistances
D D) Inverse of sum

Answer: Option C

Explanation: In a series circuit, the total resistance is the sum of all individual resistances: R_total = R1 + R2 + R3 + ...

Q17

The total resistance of resistors in parallel is

A A) The sum of all resistances
B B) Greater than highest resistor
C C) Less than smallest resistor
D D) Product of all resistances

Answer: Option C

Explanation: In a parallel circuit, the total resistance is always less than the smallest individual resistance due to multiple current paths.

Q18

The power consumed by a resistor is given by

A A) P = IV
B B) P = IR
C C) P = I²R
D D) Both A and C

Answer: Option D

Explanation: Power in electrical circuits can be calculated using P = IV or P = I²R, both derived from the basic power formula and Ohm's Law.

Q19

The device used to change resistance in a circuit is

A A) Transformer
B B) Rheostat
C C) Capacitor
D D) Relay

Answer: Option B

Explanation: A rheostat is a variable resistor used to adjust the resistance in a circuit and control current flow.

Q20

The rate of flow of electric charge is known as

A A) Potential difference
B B) Electric current
C C) Resistance
D D) Conductance

Answer: Option B

Explanation: Electric current is defined as the rate at which electric charge flows past a point in a circuit (I = Q/t).

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Electric Current and Ohm's Law Questions and Answers

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Electric Current and Ohm's Law Questions and Answers

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