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Jamb Physics Past QuestionsJamb Past Questions and Answers on Current ElectricityQuestion 6:In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is A. 10 ohms B. 1 ohms C. Zero D. 20 ohms E. Infinite Question 7:An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell? A. 5 volts B. 3.5 volts C. 2.5 volts D. 1 volts E. 10 volts Question 8:The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is A. \(\frac{6^2}{40^2}\)ohms B. \(\frac{40}{6^2}\)ohms C. \(\frac{40}{6}\)ohms D. 6 x 40 ohms E. \(\frac{6^2}{40}\)ohms Question 9:A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is A. Twice the e.m.f of the accumulator B. Less than the e.m.f by the potential drop across the resistor C. Zero D. The same as the e.m.f. E. Greater than Question 10:In a given circuit, the cell P has an emf 1.5V and an unknown internal resistance while cell Q has an emf 2.0V and an internal resistance of 1 ohm if the ammeter reads 50m A, Then r is equal to A. 0.5 ohm B. 0.62 ohm C. 1.0 ohm D. 2.0 ohm E. 3.0 ohm |
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