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Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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12 questions

SA-9702-EC3-0012 marksL1 FoundationCalculatorResistivity
A nichrome wire (ρ=1.1×10−6\rho=1.1\times10^{-6} Ω m) is 2.02.0 m long with a cross-sectional area of 2.0×10−72.0\times10^{-7} m². Calculate its resistance.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0041 markL1 FoundationCalculatorResistivity
The SI unit of resistivity is
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0051 markL1 FoundationCalculatorI–V characteristics
As the temperature of an NTC thermistor increases, its resistance
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0061 markL1 FoundationCalculatorI–V characteristics
As the light intensity on a light-dependent resistor increases, its resistance
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0071 markL1 FoundationCalculatorI–V characteristics
A filament lamp carries 0.500.50 A at 6.06.0 V. Calculate its resistance at this current.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0081 markL1 FoundationCalculatorI–V characteristics
A semiconductor diode
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0101 markL1 FoundationCalculatorI–V characteristics
A point on a lamp's II–VV graph is at 3.03.0 V and 0.300.30 A. Calculate the lamp's resistance at that point.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0121 markL1 FoundationCalculatorI–V characteristics
Ohm's law applies to a metallic conductor provided that
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0022 marksL2 StandardCalculatorResistivity
A wire 0.500.50 m long with cross-sectional area 1.0×10−71.0\times10^{-7} m² has resistance 4.04.0 Ω. Calculate its resistivity, in units of 10−710^{-7} Ω m.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0032 marksL2 StandardCalculatorResistivity
Copper has resistivity 1.7×10−81.7\times10^{-8} Ω m. Calculate the length of copper wire of cross-sectional area 1.0×10−61.0\times10^{-6} m² that has a resistance of 1010 Ω.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0092 marksL3 ExamCalculatorResistivity
A wire is stretched to twice its original length, keeping its volume constant. State the factor by which its resistance increases.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-EC3-0113 marksL3 ExamCalculatorResistivity
A wire of diameter 0.400.40 mm and length 1.51.5 m has a resistance of 2.42.4 Ω. Calculate the resistivity of its material, in units of 10−710^{-7} Ω m.

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Salam Academy Original Practice · Proposed mark scheme