MCQ Science and Technology Class 9 Chapter 3 Maharashtra Board Current Electricity 1. What does one ampere represent?One coulomb per minuteOne volt per secondOne ohm per secondOne coulomb per secondQuestion 1 of 202. What is the charge of a single electron?1.6 × 10^-19 C1.6 × 10^-9 C1.6 × 10^-6 C1.6 × 10^-12 CQuestion 2 of 203. What is 1 milliampere (mA) equal to?10^-6 A10^3 A10^-3 A10^6 AQuestion 3 of 204. What is 1 microampere (μA) equal to?10^-3 A10^-6 A10^6 A10^-9 AQuestion 4 of 205. After whom is the unit of current named?Alessandro VoltaGeorge Simon OhmJames WattAndré-Marie AmpèreQuestion 5 of 206. How much charge flows through a conductor with a 0.4 A current for 5 minutes?60 C120 C240 C30 CQuestion 6 of 207. What does Ohm’s law state about current and potential difference?Current is inversely proportional to potential differenceCurrent is directly proportional to potential differenceCurrent equals potential differenceCurrent is independent of potential differenceQuestion 7 of 208. What is the formula for Ohm’s law?V = IRI = VRR = VIV = I/RQuestion 8 of 209. What is the SI unit of resistance?VoltAmpereOhmCoulombQuestion 9 of 2010. What defines a resistance of one ohm?1 ampere with 2 volts2 amperes with 1 volt1 ampere with 0.5 volt1 ampere with 1 voltQuestion 10 of 2011. What causes resistance in a conductor?Random motion of atomsLack of free electronsCollisions of electrons with atoms and ionsHigh temperature onlyQuestion 11 of 2012. On what factors does the resistance of a conductor depend?Voltage and currentLength, area of cross-section, and materialCharge and timeTemperature onlyQuestion 12 of 2013. What is the formula for the resistance of a conductor?R = ρL/AR = ρA/LR = ρALR = L/ρAQuestion 13 of 2014. What is the SI unit of resistivity?OhmVolt-meterOhm-meterAmpere-meterQuestion 14 of 2015. What is the resistivity of copper as given in the document?1.1 × 10^-6 Ωm1.7 × 10^-8 Ωm1.62 × 10^13 Ωm1.62 × 10^18 ΩmQuestion 15 of 2016. What is an electric circuit?A device to measure voltageA continuous path for current through wires and resistancesA single wire connected to a cellA collection of insulatorsQuestion 16 of 2017. What is the function of a voltmeter in a circuit?Measures currentMeasures resistanceMeasures chargeMeasures potential differenceQuestion 17 of 2018. What characterizes conductors?Extremely high resistanceVery low resistanceNo resistanceModerate resistanceQuestion 18 of 2019. What defines insulators?Low resistanceModerate resistanceExtremely high resistanceVariable resistanceQuestion 19 of 2020. Why can the human body conduct electricity?It has no resistanceIt contains conductive fluids and tissuesIt is an insulatorIt lacks free electronsQuestion 20 of 20 Loading...
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