#### Transcript ElectricCurrentMCquestions

1. In the circuit below, which meter is not correctly connected? 1 A 3 V 2 A 4 V A. B. C. D. 1 2 3 4 2. In the circuit below, n charge carriers pass the point P in a time t. Each charge carrier has charge q. P The current in the circuit is given by the expression A. q t . B. nq t . C. . qt n D. nqt. 3. The graph below shows the variation with voltage V of the current I in three resistors X, Y and Z. • Which of the following corresponds to resistors for which the resistance increases with increasing current? • A. X only • B. Z only • C. X and Z • D. Y and Z I X Y Z 0 0 V 4.The diagrams below show combinations X, Y and Z of three resistors, each resistor having the same resistance. • Which one of the following shows the resistances of the combinations in increasing order of magnitude? com bination X com bination Y com bination Z lowest ® highest A. Y X Z B. Z X Y C. X Y Z D. Z Y X 5. The element of an electric heater has a resistance R when in operation. What is the resistance of a second heater that has a power output three times as large at the same operating voltage? A. B. C. R R 9 3 3R D. 9R 6. The graph below shows the current/voltage characteristics of a filament lamp. 24 16 –3 C urrent / × 10 A 8 0 0 2 4 6 Voltage / V 8 • The resistance of the filament at 4.0 V is • A. 250 Ω. 10 • B. 4 000 Ω. • C. 8 000 Ω. • D. 64 000 Ω. 7. The variation with potential difference V of the current I in an electric lamp is shown below • At point P, the current is Ip, the potential difference is Vp and the gradient of the tangent to the curve is G. What is the resistance of the lamp at point P? I P Ip 0 0 A. Vp 1 G B. V G C. Ip Vp D. Vp Ip 8. Which one of the following shows a correct circuit, using ideal voltmeters and ammeters, for measuring the I-V characteristic of a filament lamp? A. B. A A V C. V D. A A V V 9. A cell of e.m.f. E and internal resistance r is connected to a variable resistor. A voltmeter is connected so as to measure the potential difference across the terminals of the cell. Which one of the following is the correct circuit diagram of the arrangement? A. B. E r E r V V C. r E V D. r E V 10. A battery is connected in series with a resistor R. The battery transfers 2 000 C of charge completely round the circuit. During this process, 2 500 J of energy is dissipated in the resistor R and 1 500 J is expended in the battery. • • • • • The e.m.f. of the battery is A. 2.00 V. B. 1.25 V. C. 0.75 V. D. 0.50 V. 11. The current in the circuit shown below is constant when the switch is closed. • The energy transfer in the internal resistance r of the battery is 15 J when a charge of 40 C passes through it. For the same amount of charge, 45 J of energy is transferred in the resistor R. • Which of the following gives the e.m.f. of the battery? r R A. B. C. 15 40 V 30 40 45 V 40 D. V 60 40 V 12. In the circuits below, the cells each have the same e.m.f. and zero internal resistance. All the resistors have the same resistance. C ircuit X C ircuit Y C ircuit Z • Which of the following gives the current through the cells in order of increasing magnitude? Lowest current ® Highest current A. X Y Z B. Z X Y C. Y Z X D. Y X Z 13. The graph shows the variation with applied potential difference V of the current I in an electrical component. • Which one of the following gives the resistance of the component at point P? I I1 P A. 0 0 B. C. The gradient of the line at P v V1 The reciprocal of the gradient of the line at P The ratio I1 V1 D. The ratio V1 I1