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Important Questions

Electric Resistance and OHM's Law — Important Questions

ICSE · Class 12 · Physics

60 important questions from Electric Resistance and OHM's Law for ICSE Class 12 Physics, with answers. Written for the board exams 2027.

60 questions36 flashcards18 formulas & key relations5 concepts

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Graphs showing the variation of resistivity with temperature for different types of materials: metals, semiconductors, and alloys.
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60 Questions·
multiple choicemultiple correct

Important Questions from Electric Resistance and OHM's Law

1multiple choice
3 marks

A wire becomes 1/2 as thick after stretching, with volume unchanged. If its original resistance was 4 Ω, find the new resistance.

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64 Ω

If the wire becomes 1/2 as thick, the radius becomes half. Using R2/R1 = (r1/r2)^4, we get R2 = (2^4) × 4 Ω = 64 Ω.

2multiple choice
3 marks

Three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series across a battery. Find the equivalent resistance.

Show answer

10 Ω

For series combination, equivalent resistance is the sum of all resistances: 2 + 3 + 5 = 10 Ω.

3multiple choice
3 marks

Three resistors of 2 Ω, 3 Ω, and 6 Ω are connected in parallel. Find the equivalent resistance.

Show answer

1 Ω

Use 1/R = 1/2 + 1/3 + 1/6 = 3/6 + 2/6 + 1/6 = 1. So R = 1 Ω.

4multiple choice
3 marks

A bulb rated 60 W at 240 V is connected to its rated supply. Find the current through it.

Show answer

0.25 A

Use P = VI, so I = P/V = 60/240 = 0.25 A.

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Frequently Asked Questions

What are the important topics in Electric Resistance and OHM's Law for ICSE Class 12 Physics?
Key topics in Electric Resistance and OHM's Law include Electric Current and Current Density, Free Electrons, Relaxation Time, Drift Velocity and Mobility, Ohm's Law, Resistance and Resistivity, Derivation of Ohm's Law and Microscopic Form. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many important questions are there in Electric Resistance and OHM's Law?
Super Tutor has 60 practice questions for Electric Resistance and OHM's Law, including multiple choice, multiple correct questions. A sample with answers is on this page.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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