Electricity Practice Questions
Class 10 · Science · 1988 free MCQs with instant results and detailed explanations.
1988
Total
710
Easy
984
Medium
294
Hard
Start Practicing Electricity
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Topics in Electricity
Electric Power
484
Series and Parallel Circuits
508
Ohm's Law
451
Resistance
545
Sample Questions from Electricity
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What does Ohm's Law state?
A.
V = I × R
B.
V = I / R
C.
I = V + R
D.
R = V / I
Show Answer & Explanation
Correct Answer: A
Ohm's Law states that the voltage (V) across a conductor between two points is directly proportional to the current (I) flowing through it, with the resistance (R) being the constant of proportionality.
Q2
Easy
Which unit is used to measure electric resistance?
A.
Volts
B.
Amperes
C.
Ohms
D.
Watts
Show Answer & Explanation
Correct Answer: C
The SI unit of electric resistance is Ohm, represented by the symbol Ω.
Q3
Easy
If the voltage across a resistor is doubled, what happens to the current if the resistance remains constant?
A.
Doubles
B.
Halves
C.
Remains the same
D.
Triples
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law, if the voltage is doubled and resistance remains constant, the current must also double.
Q4
Medium
What is the relationship defined by Ohm's Law?
A.
V = IR
B.
V = I/R
C.
R = VI
D.
R = V/I
Show Answer & Explanation
Correct Answer: A
Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with resistance (R) as the constant of proportionality.
Q5
Medium
If the resistance of a circuit is doubled while the voltage remains constant, what happens to the current?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show Answer & Explanation
Correct Answer: B
According to Ohm's Law, if resistance increases and voltage remains constant, the current decreases. Halving the current results from doubling the resistance.
Q6
Medium
Which of the following statements about Ohm's Law is true?
A.
Resistance is independent of voltage
B.
Current is independent of resistance
C.
Voltage is directly proportional to current
D.
Voltage is inversely proportional to resistance
Show Answer & Explanation
Correct Answer: C
Ohm's Law states that voltage is directly proportional to current when resistance is constant.
Q7
Medium
If the current through a resistor is tripled, and the resistance remains unchanged, what happens to the voltage?
A.
It triples
B.
It doubles
C.
It remains the same
D.
It halves
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law, if the current is tripled and resistance remains constant, the voltage must also triple.
Q8
Hard
What is the relationship described by Ohm's Law?
A.
Voltage = Current x Resistance
B.
Voltage = Current / Resistance
C.
Resistance = Voltage / Current
D.
Current = Voltage + Resistance
Show Answer & Explanation
Correct Answer: A
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across it, provided the temperature remains constant.
Q9
Hard
Which of the following statements is incorrect regarding Ohm's Law?
A.
It applies to all materials.
B.
It applies at constant temperature.
C.
It defines the relationship between voltage, current, and resistance.
D.
It is a linear relationship.
Show Answer & Explanation
Correct Answer: A
Ohm's Law does not apply to all materials, especially non-ohmic materials like diodes and transistors.
Q10
Hard
If the resistance of a resistor is halved while the voltage remains constant, what happens to the current?
A.
It halves
B.
It doubles
C.
It remains the same
D.
It quadruples
Show Answer & Explanation
Correct Answer: B
According to Ohm's Law, if resistance decreases while voltage stays the same, current must increase, hence it doubles.
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Electricity — Class 10 Science Practice Questions Online
This page contains 1988 practice MCQs for the chapter Electricity in Class 10 Science. The questions are organized by difficulty — 710 easy, 984 medium, 294 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 4 topics, giving you comprehensive coverage of the entire chapter.