Potential Difference and Ohm's Law MCQs
Practice Potential Difference and Ohm's Law multiple-choice questions from Electricity (Class 10 Science) - tap an answer for instant feedback and a step-by-step solution. 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
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