Practice Test. At which position should an ammeter be placed to connected to measure the current through resistor

Transcription

1 Name Practice Test date Base your answers to questions 1 and 2 on the diagram below, which represents an electric circuit consisting of four resistors and a 12-volt battery. 1. What is the current measured by ammeter A? 1) 0.50 A 2) 2.0 A 3) 72 A 4) 4.0 A 4. Two resistors are connected to a source of voltage as shown in the diagram below. 2. What is the equivalent resistance of this circuit? 1) 72 2) 18 3) 3.0 4) In which circuit represented below are meters properly At which position should an ammeter be placed to connected to measure the current through resistor measure the current passing only through resistor R1? R1 and the potential difference across R2? 1) 1 2) 2 3) 3 4) 4 1) 2) 5. The diagram below shows the magnetic field that results when a piece of iron is placed between unlike magnetic poles. 3) 4) At which point is the magnetic field strength greatest? 1) A 2) B 3) C 4) D 6. In which diagram below is the magnetic flux density at point P greatest? 1) 2) 3) 4)

2 7. The diagram below represents a transverse wave. 11. Two pulses traveling in the same uniform medium approach each other, as shown in the diagram below. The wavelength of the wave is equal to the distance between points 1) A and G 2) B and F 3) C and E 4) D and F 8. A sound wave traveling eastward through air causes the air molecules to 1) vibrate east and west 2) vibrate north and south 3) move eastward, only 4) move northward, only 9. What is the period of a water wave if 4.0 complete waves pass a fixed point in 10. seconds? 1) 0.25 s 2) 0.40 s 3) 2.5 s 4) 4.0 s 10. The diagram below represents a wave. Which diagram best represents the superposition of the two pulses? 1) 2) 3) 4) 12. Two waves having the same frequency and amplitude are traveling in the same medium. Maximum constructive interference occurs at points where the phase difference between the two superposed waves is 1) 0 2) 90 3) 180 4) The diagram below represents a periodic wave. What is the speed of the wave if its frequency is 8.0 hertz? 1) 48 m/s 2) 16 m/s 3) 3.2 m/s 4) 1.6 m/s Which point on the wave is 90 out of phase with point P? 1) A 2) B 3) C 4) D

3 14. While playing, two children create a standing wave in a rope, as shown in the diagram below. A third child participates by jumping the rope. Base your answers to questions 17 and 18 on the information below. A transverse wave with an amplitude of 0.20 meter and wavelength of 3.0 meters travels toward the right in a medium with a speed of 4.0 meters per second. What is the wavelength of this standing wave? 1) 2.15 m 2) 4.30 m 3) 6.45 m 4) 8.60 m 15. The diagram below shows a standing wave in a string clamped at each end. 17. Calculate the period of the wave. 18. On the diagram draw a wave with twice the wave length and half the amplitude. What is the total number of nodes and antinodes in the standing wave? 1) 3 nodes and 2 antinodes 2) 2 nodes and 3 antinodes 3) 5 nodes and 4 antinodes 4) 4 nodes and 5 antinodes 16. If the diameter of a wire were decreased, its electrical resistance would 1) decrease 2) increase 3) remain the same 19. The diagram below shows the north pole of one bar magnet located near the south pole of another bar magnet. Draw three magnetic field lines in the region between the magnets.

4 Base your answer to the following question on the information below. You are given a -volt battery, ammeter, voltmeter, resistor, and resistor. Resistor R2 has a value of ohms. 20. Using appropriate symbols from the Reference Tables for Physical Setting/Physics, draw and label a complete circuit showing: resistors R 1 and R 2 connected in parallel with the battery the ammeter connected to measure the current through resistor R 1, only the voltmeter connected to measure the potential drop across resistor R 1 Base your answers to questions 21 and 22 on the information below. A 3.50-meter length of wire with a crosssectional area of 3.14 x 10-6 meter2 is at 20 Celsius. The current in the wire is 24.0 amperes when connected to a 1.50-volt source of potential difference. 21. Determine the resistance of the wire. 22. Calculate the resistivity of the wire. [Show all work, including the equation and substitution with units.]

5 Answer Key Review Circuits to waves Hz or 0.77 Hz