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Transcript
Topic 5 Review Multiple Choice Questions E1. Which graph shows the variation of current with voltage for the filament of a light bulb ? A B I E3. E5. I 0 V low, low B. low, high C. high, high D. high, low Consider a small string of lightbulbs used to decorate a tree. If one filament burns out the others will A. all go out B. glow dimmer than before C. glow just as bright as before D. glow brighter than before 8 ohms What current flows through this circuit? B. 0.5 A C. 8 A D. 16 A E6. 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? A. 1 G B. G C. Ip Vp D. 6V 8V I P Ip Vp Ip 0 0 Vp A 6 volt cell is connected to a circuit. Each electron that leaves the cell has ____________. A. E8. V Short circuits are dangerous because they involve ______ resistance and ______ current. A. 0.25 A E7. 0 V If n charge carriers, each of charge q, pass a point in a time t, then the current in the circuit is nq qt q A. . B. . C. . D. nqt. t n t A. E4. 0 V D I I 0 E2. C 6 V of charge B. 6 J of charge C. 6 J of energy D. 6 eV of energy A conductor of constant resistance dissipates 12 W when the potential difference across it is 12 V. The power that will be dissipated in this conductor when the potential difference across it is 24 V is A. 6.0 W B. 12 W C. 24 W D. 48 W V E9. The resistors in each of the circuits shown below each have the same resistance. circuit P circuit Q circuit S Which of the following gives the circuits in order of increasing total resistance? A. P, Q, S B. Q, P, S C. S, Q, P D. P, S, Q E10. The work done on a positive point charge of magnitude 3.0 nC as it is moved at constant speed from one point to another is 12 nJ. The potential difference between the two points is A. 0.0 V. E11. 0.25 V. C. 4.0 V. D. 36 V. A one hundred watt light globe gives out a brighter light than a 60 W globe because A. B. C. D. E12. B. a larger potential difference is used to run it it has a longer resistance wire filament more electric current flows through it it has a higher amount of inert gas in it A six volt cell is connected to a resistor in a simple series circuit. If it was replaced by a 12 volt cell, then there would be _______________ electrons leaving the cell per second, and each electron leaving the cell would have_______________ energy. A. B. C. D. the same number of the same number of twice as many twice as many the same amount of twice as much twice as much the same amount of E13. The electrical potential difference between two points is the …………….. required to move a charge from one point to the other. A. force C. energy B. force per unit charge D. energy per unit charge E14. A battery (negligible internal resistance) is connected to three identical lamps L, M and N of constant resistance as shown. M and N are in parallel. The filament of lamp N breaks. Which of the following shows the subsequent changes to the brightness of lamp L and lamp M? A. B. C. D. lamp L lamp M stays the same increases increases decreases decreases stays the same decreases increases E15. In the circuit above, if the resistors are not equal, which of the following must be true? A. B. C. D. E16. If two points in an electric circuit have the same potential then… A. B. C. D. E17. charges lose no energy travelling between the two points the circuit must contain parallel branches the supply must have no internal resistance no current will flow between them Consider a wire of resistance R. If it is stretched until it is twice its original length, while keeping the same volume, its new resistance will be A. E18. Lamps L and N have the same current through them. Lamps L and M have the same current through them. Lamps L and N have the same potential difference across them. Lamps M and N have the same potential difference across them. 𝑅 2 B. R C. 2R D. 4R Two rectangular blocks, X and Y, of the same material have different dimensions but the same overall resistance. Which of the following equations is correct? A. resistivity of X × length of X = resistivity of Y × length of Y B. length of X × cross sectional area of Y = length of Y × cross sectional area of X C. resistivity of X × cross sectional area of X = resistivity of Y × cross sectional area of Y D. length of X × cross sectional area of X = length of Y × cross sectional area of Y E19. A strain gauge S is connected in series with a fixed resistor R. When a strain is placed upon the strain gauge, the reading on the voltmeter will _____________ and the current will _________________. A B C D. increase decrease increase decrease increase increase decrease decrease S R V E20. A voltage V is applied across a fixed resistor (R ohms) in series with a light dependent resistor of resistance L. The voltage across the LDR is given by A. 𝑉 𝐿+𝑅 B. 𝐿+𝑅 𝑉 C. 𝐿𝑉 𝐿+𝑅 D. 1 b 2 b 3 b 4 a 5 a 6 d 7 d 8 d 9 b 10 c 11 c 12 c 13 c 14 d 15 d 16 a 17 d 18 b 19 c 20 c 𝑅+𝐿 𝑅𝑉