1. A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is 0.5 A.

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1 . A battery of internal resistance 2 Ω is connected to an external resistance of 0 Ω. The current is 0.5 What is the emf of the battery?.0 V B. 5.0 V C. 6.0 V D V 2. Two electrodes, separated by a distance d, in a vacuum are maintained at a constant potential difference. An electron, accelerated from one electrode to the other, gains kinetic energy E k. The distance between the electrodes is now changed to 3 d. What is the gain in kinetic energy of an electron that is accelerated from one electrode to the other? E k 3 B. E k C. 3 E k D. 9 E k IB Questionbank Physics

2 3. The graph shows the I V characteristics of two resistors. When resistors X and Y are connected in series, the current in the resistors is 2.0 What is the resistance of the series combination of X and Y? 7.0 Ω B..3 Ω C.. Ω D. 0.4 Ω IB Questionbank Physics 2

3 4. Two resistors, of resistance R and R 2, are connected in series with a cell of emf ε and negligible internal resistance. Which expression gives the potential difference across the resistor of resistance R? R R R 2 B. R R2 R C. R2 R R 2 R R2 D. R2 5. A point charge of magnitude 2.0 μc is moved between two points X and Y. Point X is at a potential of +6.0 V and point Y is at a potential of +9.0 V. The gain in potential energy of the point charge is 0.20 μj. B..5 μj. C. 6.0 μj. D. 30 μj. IB Questionbank Physics 3

4 6. A resistor of resistance 2 Ω is connected in series with a cell of negligible internal resistance. The power dissipated in the resistor is P. The resistor is replaced with a resistor of resistance 3.0 Ω. What is the power dissipated in this resistor? 0.25 P B. P C. 2.0 P D. 4.0 P 7. The electromotive force (emf) of a cell is defined as the power supplied by the cell per unit current from the cell. B. the force that the cell provides to drive electrons round a circuit. C. the energy supplied by the cell per unit current from the cell. D. the potential difference across the terminals of the cell. 8. A copper wire, of electric resistance R, has a length L and a cross-section area S. Another copper wire has a length 2L and a cross-section area of 2 S. Which of the following is the resistance of this wire? B. R 4 R 2 C. 2R D. 4R IB Questionbank Physics 4

5 9. The graph shows how the current I in a resistor varies with the voltage V applied across it. Which of the following gives the resistance of the resistor, when I = I? V I B. The slope of the curve at the point (V, I ) C. I V D. The inverse of the slope of the curve at the point (V, I ) IB Questionbank Physics 5

6 0. Two 0 Ω resistors are connected as shown. What is the resistance across PQ? 0 Ω B. 5 Ω C. 0 Ω D. 20 Ω. Two resistors, made of the same material, are connected in series to a battery. The length of resistor X is twice that of resistor Y, and X has twice the cross-sectional area of Y. Which of the following gives resistanceof X? resistanceof Y B. 4 2 C. D. 4 IB Questionbank Physics 6

7 2. The circuit shows a resistor R connected in series with a battery and a resistor of resistance 0 Ω. The emf of the battery is 20 V and it has negligible internal resistance. The current in the circuit is.0 Which of the following is the resistance of R?.0 Ω B. 2.0 Ω C. 0 Ω D. 20 Ω 3. Three identical resistors are connected to a battery as shown. Which of the following is a correct statement? The current through X is greater than that through Z. B. The potential difference across Z is greater than that across Y. C. The potential difference across resistor X and Y together is the same as that across Z. D. The current through Z is less than the total current through X and Y. IB Questionbank Physics 7

8 4. Two 6 Ω resistors are connected in series with a 6 V cell. A student incorrectly connects an ammeter and a voltmeter as shown below. The readings on the ammeter and on the voltmeter are Ammeter reading / A Voltmeter reading / V B C D IB Questionbank Physics 8

9 5. The tungsten filament of a lamp has a cross-sectional area A and length L. For a potential difference V across the filament, the current in the filament is I. The resistivity of the tungsten equals B. C. D. V A. I L I L. V A V L. I A I A V L 6. A cell of emf ε and internal resistance r delivers current to a small electric motor. 450 C of charge flows through the motor and 9000 J of energy are converted in the motor. 800 J are dissipated in the cell. The emf of the cell is 4.0 V. B. 6 V. C. 20 V. D. 24 V. IB Questionbank Physics 9

10 7. In the circuits below the cells have the same emf and zero internal resistance. The resistors all have the same resistance. Which of the following gives the ratio power dissipated in X? power dissipated in Y B. 4 2 C. 2 D A cylindrical conductor of length l, diameter D and resistivity ρ has resistance R. A different cylindrical conductor of resistivity 2ρ, length 2l and diameter 2D has a resistance 2R. B. R. C. R. 2 D. R. 4 IB Questionbank Physics 0

11 9. In the circuit below, the battery has negligible internal resistance. Three identical lamps L, M and N of constant resistance are connected as shown. The filament of lamp N breaks. Which of the following shows the subsequent changes to the brightness of lamp L and lamp M? Lamp L Lamp M stays the same decreases B. increases stays the same C. increases decreases D. decreases increases IB Questionbank Physics

12 20. In the circuit below, the voltmeter has a resistance 00 k. The battery has negligible internal resistance and emf 6 V. The reading on the voltmeter is 0 V. B. 2 V. C. 3 V. D. 4 V. IB Questionbank Physics 2

13 2. In the circuit shown below, the cell has negligible internal resistance. Which of the following equations is correct? I = 2I 2 B. I = 2I 3 C. I 2 = 2I 3 D. I 3 = 2I IB Questionbank Physics 3