Current Electricity - Resistivity, Color Code, Combinations
Physics · Grade 12 · Week 8 · 25 questions
In CBSE Grade 12 physics, Current Electricity is a heavyweight chapter dealing with Resistivity, Color Code, and Combinations. Expect at least one long-answer (5-mark) question from this chapter on the board paper almost every year.
What you'll practise
- Analyse Resistivity
- Derive Color Code
- Identify Combinations
- Solve CBSE board-pattern problems from current electricity including NCERT exemplar-level questions
All 25 questions in this Current Electricity - Resistivity, Color Code, Combinations quiz
Grade 12 Physics — Current Electricity - Resistivity, Color Code, Combinations: 25 practice questions with instant scoring and explanations.
- Resistivity depends on:
- Resistivity of pure metals with temperature:
- Resistivity of alloys like manganin, constantan:
- Resistors in series: R = :
- Resistors in parallel: 1/R = :
- Two equal 10 Ω resistors in series:
- Two equal 10 Ω resistors in parallel:
- Current through series resistors is:
- Voltage across parallel resistors is:
- Resistor color code: 1st band yellow, 2nd violet, 3rd red, 4th gold:
- Colors in code: Black = :
- Red in color code = :
- Gold tolerance band = :
- Silver tolerance band = :
- No color (tolerance) = :
- In a household circuit, appliances are typically connected in:
- A 60 W bulb at 220 V has resistance ≈ :
- Power rating P = V²/R, so at lower V the bulb:
- Fuse wire is made of:
- A fuse melts when:
- EMF and potential difference differ because:
- Terminal voltage V = :
- Internal resistance r is due to:
- Two cells of EMF ε₁, ε₂ in series: total EMF = :
- Two identical cells EMF ε in parallel: total EMF = :
Question 1 of 250 correct so far