MCQ Science and Technology Class 9 Chapter 3 Maharashtra Board Current Electricity 1. How much current flows through a 1000 Ω bulb filament with 230 V applied?0.23 A2.3 A0.023 A23 AQuestion 1 of 202. What is the resistance of a conductor with 24 V and 0.24 A current?50 Ω100 Ω200 Ω10 ΩQuestion 2 of 203. What potential difference is required for 0.3 A to flow through a 500 Ω resistor?100 V150 V50 V200 VQuestion 3 of 204. What is the resistance of a 1 km copper wire with a 0.5 mm diameter (ρ = 1.7 × 10^-8 Ωm)?170 Ω8.5 Ω85 Ω42.5 ΩQuestion 4 of 205. What is the effective resistance of three resistors (15 Ω, 3 Ω, 4 Ω) in series?12 Ω45 Ω60 Ω22 ΩQuestion 5 of 206. What is the current through a series circuit of 16 Ω and 14 Ω resistors with 18 V?1.2 A0.6 A2.4 A0.3 AQuestion 6 of 207. What is the effective resistance of three resistors (15 Ω, 20 Ω, 10 Ω) in parallel?4.615 Ω10 Ω20 Ω45 ΩQuestion 7 of 208. What is the total current in a parallel circuit of 5 Ω, 10 Ω, and 30 Ω resistors with 12 V?2.4 A1.2 A4.0 A0.4 AQuestion 8 of 209. What is a key feature of resistors in series?Same potential difference across eachSame current flows through eachCurrent varies across eachEffective resistance is less than individual resistancesQuestion 9 of 2010. How is effective resistance calculated for resistors in series?Average of individual resistancesProduct of individual resistancesSum of individual resistancesInverse of the sum of resistancesQuestion 10 of 2011. What is true about resistors in parallel?Same current through eachDifferent potential differences across eachSame potential difference across eachEffective resistance is greater than individual resistancesQuestion 11 of 2012. How is effective resistance determined for resistors in parallel?Sum of individual resistancesInverse of the sum of inverses of resistancesProduct of individual resistancesAverage of individual resistancesQuestion 12 of 2013. What is the role of the live wire in domestic wiring?Returns currentBrings in currentGrounds the circuitMeasures voltageQuestion 13 of 2014. What is the function of the neutral wire in a domestic circuit?Brings in currentGrounds the circuitReturns currentIncreases resistanceQuestion 14 of 2015. What is the voltage difference between live and neutral wires in India?110 V220 V330 V440 VQuestion 15 of 2016. What is the purpose of the earth wire in domestic wiring?Brings in currentReturns currentMeasures currentProvides safety through groundingQuestion 16 of 2017. What does a fuse wire do in a domestic circuit?Increases currentMeasures voltageProtects appliances by breaking the circuitReduces resistanceQuestion 17 of 2018. Why should rubber-soled footwear be worn when handling electrical appliances?To enhance appliance efficiencyTo increase conductivityTo prevent current flow through the bodyTo measure currentQuestion 18 of 2019. What should be done if someone receives an electric shock?Pour water on the personTouch the person to helpIncrease the currentSwitch off the main switch or use a wooden poleQuestion 19 of 2020. What is the current if 420 C of charge flows through a wire in 5 minutes?2.8 A0.7 A1.4 A0.35 AQuestion 20 of 20 Loading...
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