Current Electricity Practice Questions
JEE · Physics · 1567 free MCQs with instant results and detailed explanations.
1567
Total
368
Easy
670
Medium
529
Hard
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Topics in Current Electricity
Ohm's Law
176
Kirchhoff's Laws
191
Wheatstone Bridge
164
Potentiometer
196
Meter Bridge
211
RC Circuits
193
Drift Velocity
228
Resistivity
208
Sample Questions from Current Electricity
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following statements correctly describes Ohm's Law?
A.
The current through a conductor is directly proportional to the voltage across it.
B.
The resistance in a circuit increases with an increase in current.
C.
Voltage is the measure of the charge in a circuit.
D.
Current is inversely proportional to resistance in a circuit.
Show Answer & Explanation
Correct Answer: A
Ohm's Law states that current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points, provided that the temperature remains constant.
Q2
Easy
What is the relationship between voltage (V), current (I), and resistance (R) as per Ohm's Law?
A.
V = I * R
B.
V = I + R
C.
V = I / R
D.
V = I - R
Show Answer & Explanation
Correct Answer: A
Ohm's Law states that the voltage across a conductor is directly proportional to the current flowing through it, with resistance being the proportionality constant.
Q3
Easy
What happens to the current in a circuit if the resistance is doubled while the voltage remains constant?
A.
The current is halved
B.
The current doubles
C.
The current remains the same
D.
The current quadruples
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law, if resistance increases while voltage stays constant, the current decreases, specifically halving if the resistance doubles.
Q4
Medium
If the resistance of a wire is doubled while keeping the voltage constant, what happens to the current flowing through the wire?
A.
It doubles
B.
It stays the same
C.
It halves
D.
It quadruples
Show Answer & Explanation
Correct Answer: C
Using Ohm's Law, if R is doubled (2R) and V is constant, the new current I' = V/(2R) = I/2. Thus, the current halves.
Q5
Medium
Which of the following statements correctly represents Ohm's Law?
A.
V = IR
B.
R = VI
C.
I = RV
D.
P = IV
Show Answer & Explanation
Correct Answer: A
Ohm's Law states that voltage (V) across a conductor is directly proportional to the current (I) through it, with R being the constant.
Q6
Medium
If a conductor's resistance increases due to temperature rise, what happens to the current if the voltage remains constant?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes negative
Show Answer & Explanation
Correct Answer: B
According to Ohm's Law, if R increases and V remains constant, current I must decrease.
Q7
Medium
A 10-ohm resistor is connected across a 20 V power supply. What is the power consumed by the resistor?
A.
40 W
B.
20 W
C.
10 W
D.
0 W
Show Answer & Explanation
Correct Answer: A
Using the formula P = V^2/R, power P = (20 V)^2 / 10 Ω = 400/10 = 40 W.
Q8
Hard
A conductor has a resistance of 10 ohms. If the voltage across it is doubled, what happens to the current flowing through it?
A.
It doubles.
B.
It remains the same.
C.
It triples.
D.
It halves.
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law (V = IR), if the voltage (V) is doubled and resistance (R) stays constant, the current (I) must also double.
Q9
Hard
A wire is stretched to twice its original length. How does its resistance change assuming uniform cross-section and material?
A.
It doubles.
B.
It quadruples.
C.
It remains unchanged.
D.
It halves.
Show Answer & Explanation
Correct Answer: B
Resistance is proportional to the length of the conductor and inversely proportional to its cross-sectional area. If the length doubles, resistance increases by a factor of four.
Q10
Hard
If a conductor obeys Ohm's Law, what is the shape of the V-I graph?
A.
Linear
B.
Exponential
C.
Logarithmic
D.
Parabolic
Show Answer & Explanation
Correct Answer: A
For a conductor obeying Ohm's Law, current is directly proportional to voltage, resulting in a linear relationship on the V-I graph.
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Current Electricity — JEE Physics Practice Questions Online
This page contains 1567 practice MCQs for the chapter Current Electricity in JEE Physics. The questions are organized by difficulty — 368 easy, 670 medium, 529 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 8 topics, giving you comprehensive coverage of the entire chapter.