Potential Difference and Ohm's LawPractice Questions & MCQs
Practice Potential Difference and Ohm's Law questions from Electricity (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Potential Difference and Ohm's LawQuiz - Solve & Score
Q1. If the resistance of a conductor is doubled while the potential difference across it is kept the same, what happens to the current through it?
- A.It becomes half of its former value
- B.It doubles
- C.It becomes four times
- D.It remains the same
Answer: A. It becomes half of its former value
Q2. A 10 V battery drives a current of 2 A through a resistor R1. What is the value of R1?
- A.5 Ω
- B.20 Ω
- C.0.2 Ω
- D.12 Ω
Answer: A. 5 Ω
Reading the problem, 10 V, 2 A (physics, chapter 'Electricity'). The unknown we need is What is the value of R1?. This is a classic application of Ohm's law states V = IR, so the resistance R = V/I. The arithmetic is: Substituting: R1 = 10 V / 2 A = 5 Ω. Always rearrange the formula for the quantity you need before putting in the numbers. That lands on option A) 5 Ω. As for the others, option B) '20 Ω' fails since This multiplies V and I; Ohm's law uses R = V/I; option C) '0.2 Ω' misses the point - This is I/V; the correct relation is R = V/I.
Q3. A 12 V battery sends current through a resistor of 5 Ω. What is the current (I) flowing through the resistor?
- A.2.4 A
- B.0.42 A
- C.60 A
- D.17 A
Answer: A. 2.4 A
Master Potential Difference and Ohm's Law on RankByte
Step-by-step solutions, mock tests, live ranks and streaks - free to start.
Get early accessPotential Difference and Ohm's Law - Frequently asked questions
Where can I practise Potential Difference and Ohm's Law questions for Class 10 Science?
RankByte has Potential Difference and Ohm's Law practice questions and MCQs from Electricity (Class 10 Science), each with the correct answer and a step-by-step solution - free to start.
Are these Potential Difference and Ohm's Law questions important for the exam?
Yes. These Potential Difference and Ohm's Law important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
Do the Potential Difference and Ohm's Law questions come with answers and solutions?
Every Potential Difference and Ohm's Law question on RankByte comes with the correct answer and a full step-by-step solution, so you learn the concept instead of just guessing.