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Electric Resistance and OHM's Law — Practice Quiz

ICSE · Class 12 · Physics

Try a 4-question quiz on Electric Resistance and OHM's Law for ICSE Class 12 Physics: tap an answer to check it and see why.

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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Quick Quiz: Electric Resistance and OHM's Law

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1

A wire of resistance 5 Ω carries a current of 2 A. Find the potential difference across the wire.

2

A conductor has length 2 m, cross-sectional area 1 × 10^-6 m^2, and resistivity 2 × 10^-7 Ω m. Find its resistance.

3

A wire of length 4 m and area of cross-section 2 × 10^-6 m^2 has resistance 8 Ω. Find its resistivity.

4

A wire has resistance 3 Ω. It is stretched to 3 times its original length without changing its volume. Find the new resistance.

60 Questions·
multiple choicemultiple correct

Sample Questions

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.

Show answer

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 practice questions are there for Electric Resistance and OHM's Law?
There are 60 questions on Electric Resistance and OHM's Law. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

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

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