serway physics poll
DESCRIPTION
College Physics Poll SerwayMultiple Choice QuestionsChapterTRANSCRIPT
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A 10 V emf battery is connected in series with the following: a 2 microfarad capacitor, a 2 ohm resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. After the switch has been closed for a relatively long period (several seconds, say), what are the current and capacitor voltage readings, respectively?
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1. zero A, 10 V
2. zero A, zero V
3. 5 A, zero V
4. 5 A, 10 V
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The following three appliances are connected to a 120 volt house circuit: i) toaster, 1200 W, ii) coffee pot, 750 W, and iii) microwave, 600 W. If all were operated at the same time what total current would they draw?
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1. 3 A
2. 5 A
3. 10 A
4. 21 A
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A 10 V emf battery is connected in series with the following: a 2 microfarad capacitor, a 2 ohm resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. At the instant the switch is closed, what are the current and capacitor voltage readings, respectively?
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1. zero A, 10 V
2. zero A, zero V
3. 5 A, zero V
4. 5 A, 10 V
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A battery with an emf of 6.3 V is connected in series with a resistor of 2.0 ohms. What is the total power delivered by the battery to the circuit?
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1. 22.0 W
2. 20.0 W
3. 12.6 W
4. 25.2 W
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A battery with an emf of 6.3 V is connected across the ends of an external resistor of 2 ohms. What is the current through the resistor?
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1. 12.6 A
2. 6.3 A
3. 3.15 A
4. 5.3 A
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Three resistors having values of 4.0, 6.0 and 8.0 ohms, are connected in series. What is their equivalent resistance?
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1. 18.0 ohms
2. 8.0 ohms
3. 6.0 ohms
4. 1.8 ohms
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Three resistors having values of 4.0, 6.0 and 10.0 ohms, are connected in parallel. What is their equivalent resistance?
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1. 20.0 ohms
2. 7.3 ohms
3. 6.0 ohms
4. 1.9 ohms
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Three resistors connected in parallel have individual values of 4.0, 6.0 and 10.0 ohms, respectively. If this circuit is connected to a 12.0 V battery what is the current in the 10 ohm resistor?
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1. 0.55 A
2. 5.2 A
3. 1.2 A
4. 2.0 A
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Three resistors connected in parallel have individual values of 4.0, 6.0 and 10.0 ohms, respectively. If this combination is connected in series with a 12.0 V battery and a 2.0 ohm resistor, what is the current in the 10 ohm resistor?
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1. 0.59 A
2. 1.0 A
3. 11.2 A
4. 16.0 A
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Consider the circuit shown in the figure. What power is dissipated by the entire circuit?
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1. 14 W
2. 28 W
3. 56 W
4. 112 W
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If I = 2.0 mA and the potential difference, VA - VB= +30
V in the circuit segment shown, determine the charge and polarity of the capacitor.
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1. 1.5 mC, left plate is positive
2. 1.5 mC, right plate is positive
3. 0.50 mC, left plate is positive
4. 0.50 mC, right plate is positive
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A series RC circuit has a time constant of 1.0 s. The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA. The capacitor is initially uncharged. What is the charge on the capacitor 2.0 s after the switch is closed?
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1. 0.43 C
2. 0.66 C
3. 0.86 C
4. 0.99 C
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A voltage source of 10 V is connected to a series 2 C circuit where R = 2 x 106 W and C = 3 µ F. Find the time required for the current in the circuit to decay to 5% of its original value.
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1. 3 s
2. 6 s
3. 9 s
4. 18 s
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In the circuit segment shown, I = 20 mA and Q = 50 µ C. What is the potential difference, VA - VB ?
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1. -40 V
2. +40 V
3. +20 V
4. -20 V
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If E = 20 V, at what rate is thermal energy being generated in the 20 W resistor?
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1. 6.5 W
2. 1.6 W
3. 15 W
4. 26 W
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If E = 24 V, at what rate is thermal energy generated in the 5 W resistor?
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1. 13 W
2. 3.2 W
3. 23 W
4. 39 W
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If E = 9.0 V, what is the current in the 15-W resistor?
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1. 0.20 A
2. 0.30 A
3. 0.10 A
4. 0.26 A
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In a circuit, a current of 1.0 A is drawn from a battery. The current then divides and passes through two resistors in parallel. One of the resistors has a value of 64 W and the current through it is 0.2 A. What is the value of the other resistor?
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1. 8 W
2. 16 W
3. 24 W
4. 32 W
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Four 1.5 volt AA batteries in series are used to power a transistor radio. If the batteries hold a total charge of 240 C, how long will they last if the radio has a resistance of 200 W?
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1. 1.1 hours
2. 2.2 hours
3. 4.1 hours
4. 13 hours
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What is the maximum number of 100 Watt lightbulbs you can connect in parallel in a 120 V home circuit without tripping the 20 A circuit breaker?
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1. 11
2. 17
3. 23
4. 29
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An electric heater draws 1300 W, a toaster draws 1000 W, and an electric oven draws 1540 W. If all three of these appliances are operating in parallel on a 120 V circuit, what is the total current draw?
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1. 23.4 A
2. 31.7 A
3. 39.9 A
4. 47.7 A
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How much power is being given off by one of the 10 ohm resistors?
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1. 24.0 W
2. 9.6 W
3. 16.0 W
4. 6.4 W
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What is the current flowing through the 2 ohm resistor?
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1. 2 A
2. 3 A
3. 4 A
4. 6 A
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What is the current flowing through the 8 ohm resistor?
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1. 1 A
2. 2 A
3. 3 A
4. 6 A
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What is the equivalent resistance for these resistors?
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1. 2.3 ohms
2. 5.2 ohms
3. 13 ohms
4. 22 ohms
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What is the equivalent resistance for these resistors?
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1. 1.33 ohms
2. 2.25 ohms
3. 3.0 ohms
4. 7.5 ohms
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What is the potential difference between point a and b ?
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1. 6 V
2. 8 V
3. 12 V
4. 24 V
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How much current is flowing in one of the 10 ohm resistors?
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1. 0.8 A
2. 2.0 A
3. 1.6 A
4. 2.4 A
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Consider the wheatstone bridge circuit. R3 = 4W and
the ratio R2 /R4 = 3 and the galvanometer reads zero
current. If the current in R3 = 0.50 A, what is the current
in R1 ?
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1. 0.17 A
2. 0.50 A
3. 1.5 A
4. 0.75 A
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What is the current through the 4 ohm resistor?
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1. 1.0 A
2. 0.5 A
3. 1.5 A
4. 2.0 A
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What is the current through the 8 ohm resistor?
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1. 1.0 A
2. 0.5 A
3. 1.5 A
4. 2.0 A
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Consider the wheatstone bridge circuit. R3 = 4W and
the ratio R2 /R4 = 3 and the galvanometer reads zero
current. If the current in R3 is 0.50 A, what is the current
in R4 ?
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1. 0.17 A
2. 0.50 A
3. 1.5 A
4. 0.75 A
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Consider the wheatstone bridge circuit. R3 = 4W and the ratio R2 /R4 = 3. The galvanometer reads zero current. What is R1 ?
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1. 0.75 ohms
2. 1.33 ohms
3. 12 ohms
4. 15 ohms
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Consider the wheatstone bridge circuit. R3 = 4W and the
ratio R2 /R4 = 3 and the galvanometer reads zero
current. The potential difference across R4 is 3 V. What
is the potential difference across R2 ?
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1. 1 V
2. 2 V
3. 3 V
4. 9 V
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If a certain capacitor is charged to 10 V and then, at t = 0, allowed to discharge through a certain resistor. There will be a certain time before the voltage across the capacitor reaches 5 V. This time can be decreased for this circuit by increasing
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1. the size of the capacitor.
2. the size of the resistor.
3. the size of the time constant.
4. none of the choices.
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Three resistors, each with resistance R1, are in parallel
in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the previous circuit,
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1. the current through R equals the current through R1
2. the voltage across R equals the voltage across R1
3. the power given off by R equals the power given off by R1
4. R is bigger than R1
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What is Kirchhoff's 1st equation for this junction?
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1. I1 = l2 + l32. I2 = I1 + l23. I3 = I1 + l24. I1 + I2 + l3 = 0
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Three resistors, each with resistance R1 , are in series
in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the previous circuit,
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1. the current through R equals the current through R1
2. the voltage across R equals the voltage across R1
3. the power given off by R equals the power given off by R1
4. R is smaller than R1
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Which voltage is not caused by a source of emf?
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1. the voltage across a charged capacitor
2. the voltage across two copper-iron junctions at different temperatures
3. the voltage across the terminals of a dry cell battery
4. the voltage from an electric generator
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Which resistor is in series with resistor R?
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1. R1
2. R2
3. R3
4. R4
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Which two resistors are in parallel with each other?
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1. R and R4
2. R2 and R3
3. R2 and R4
4. R and R1
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A 1000 V battery, a 3000 ohm resistor and a 0.5 microfarad capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, tau, is defined as the time that the capacitor takes to charge to 63% of its capacity after the switch is closed. What is the current in the circuit at a time interval of tau seconds after the switch has been closed?
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1. 0.14 A
2. 0.21 A
3. 0.12 A
4. 0.32 A
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A 1000 V battery, a 3000 ohm resistor and a 0.5 microfarad capacitor are connected in series with a switch. The capacitor is initially uncharged. What is the value of the current the moment after the switch is closed?
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1. 0.39 A
2. 0.33 A
3. 0.84 A
4. 2000 A
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A 1000 V battery, a 3000 ohm resistor and a 0.5 microfarad capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, tau, is defined as the time required to charge the capacitor to 63% of its capacity after the switch is closed. What is the value of tau for this circuit?
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1. 6.0 x 109 s
2. 1.67 x 10-10 s
3. 1.67 x 10-7 s
4. 1.5 x 10-3 s
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Two resistors of values 6 and 12 ohms are connected in parallel. This combination in turn is hooked in series with a 3 ohm resistor and a 24 V battery. What is the current in the 6 ohm resistor?
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1. 2.0 A
2. 3.0 A
3. 6.0 A
4. 12.0 A
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Which of the following devices is designed to measure an approximate value for the resistance of a conductor?
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1. ammeter/voltmeter combination
2. voltmeter
3. thermocouple
4. ammeter
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Three resistors, with values of 3, 6 and 12 ohms, respectively, are connected in series. What is the overall resistance of this combination?
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1. 0.58 ohms
2. 1.7 ohms
3. 7.0 ohms
4. 21.0 ohms
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Three resistors, with values of 3, 6 and 12 ohms, respectively, are connected in parallel. What is the overall resistance of this combination?
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1. 0.58 ohms
2. 1.7 ohms
3. 7.0 ohms
4. 21.0 ohms
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Which of the following devices is designed to measure the resistance of a conductor more accurately?
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1. ammeter/voltmeter combination
2. voltmeter
3. Wheatstone bridge
4. ammeter
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Two resistors of values 6 and 12 ohms are connected in parallel. This combination in turn is hooked in series with a 4 ohm resistor. What is the overall resistance of this combination?
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1. 0.5 ohms
2. 2.0 ohms
3. 8.0 ohms
4. 22.0 ohms
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Two resistors of values 6 and 12 ohms are connected in parallel. This combination in turn is hooked in series with a 2 ohm resistor and a 24 V battery. What is the current in the 2 ohm resistor?
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1. 2.0 A
2. 4.0 A
3. 6.0 A
4. 12.0 A
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Three resistors with values R1 , R2 and R3 , respectively, are connected in parallel. Which of the following expresses the total resistance, R t , of the three resistors when connected in parallel?
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1. Rt = R1 + R2 + R3
2. Rt = (1/R1 + 1/R2 + 1/R3)
3. Rt = R1 = R2 = R3
4. Rt = (1/R1 + 1/R2 +1/R3 )-1
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Three resistors with values of R1 , R2 and R3 , respectively, are connected in series. Which of the following expresses the total resistance, R t , of the three resistors?
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1. Rt = R1 + R2 + R3
2. Rt = (1/R1 + 1/R2 + 1/R3)
3. Rt = R1 = R2 = R3
4. Rt = (1/R1 + 1/R2 +1/R3 )-1
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Three resistors connected in parallel have the individual voltages labeled V1 , V2 and V3 , respectively. Which of
the following expresses the total voltage across the three resistors when connected in this manner?
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1. Vt = V1 + V2 + V3
2. Vt = (1/V1 + 1/V2 + 1/V3)
3. Vt = V1 = V2 = V3
4. Vt = (1/V1 + 1/V2 +1/V3 )-1
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Three resistors connected in series have individual voltages labeled V1 , V2 and V3 , respectively. Which of
the following expresses the value of the total voltage taken over the three resistors together?
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1. Vt = V1 + V2 + V3
2. Vt = (1/V1 + 1/V2 + 1/V3)
3. Vt = V1 = V2 = V3
4. Vt = (1/V1 + 1/V2 +1/V3 )-
1
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Three resistors connected in series each carry currents labeled I1 , I2 and I3 . Which of the following expresses
the value of the total current It in the system made up of the three resistors in series?
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1. lt = l1 + l2 + l3
2. lt = (1/l1 + 1/l2 + 1/l3)
3. lt = l1 = l2 = l3
4. lt = (1/l1 + 1/l2 +1/3 )-1
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Three resistors connected in parallel each carry currents labeled I1 , I2 and I3 . Which of the following
expresses the value of the total current It in the combined system?
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1. lt = l1 + l2 + l3
2. lt = (1/l1 + 1/l2 + 1/l3)
3. lt = l1 = l2 = l3
4. lt = (1/l1 + 1/l2 +1/3 )-1
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A circuit contains 3 V battery, a 2 ohm resistor, a 0.3 microfarad capacitor, an ammeter, and a switch all in series. What will be the current reading 10 min after the switch is closed?
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1. zero
2. 0.75 A
3. 1.5 A
4. 107 A
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A circuit contains a 3 V battery, a 2 ohm resistor, a 0.3 microfarad capacitor, an ammeter, and a switch in series. The sum of all the potential differences taken for all the components going around the loop is which of the following?
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1. zero
2. 3.0 V
3. -3.0 V
4. 6.0 V
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The basic function of an electromotive force in a circuit is to do which of the following?
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1. convert electrical energy into some other form
2. convert some other form of energy into electrical
3. Both of the choices are valid
4. None of the choices are valid