MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Transcription

1 Exam Name ISCI Test 3 Review MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The fundamental force underlying all chemical reactions is A) nuclear. B) gravitational. C) electrical. D) centripetal. 1) 2) A main difference between gravitational and electric forces is that electrical forces A) obey the inverse-square law. B) repel or attract. C) act over shorter distances. D) attract. E) are weaker. 2) 3) An electron and a proton A) attract each other. B) repel each other. 3) 4) To say that an object is electrically polarized is to say A) its charges have been rearranged. B) it is only partially conducting. C) it is to some degree magnetic. D) its internal electric field is zero. E) it is electrically charged. 4) 5) Electrons are made to flow in a wire when there is A) more potential energy at one end of the wire than the other. B) a potential difference across its ends. C) an imbalance of charges in the wire. 5) 6) An ampere is a unit of electrical A) resistance. B) current. C) pressure. 6) 7) When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is A) less than the resistance of either lamp. B) more than the resistance of either lamp. C) neither A nor B 7) 1

2 8) When two lamps are connected in series to a battery, the electrical resistance that the battery senses is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) neither A nor B 8) 9) Like kinds of magnetic poles repel while unlike kinds of magnetic poles A) repel also. B) attract. C) may attract or repel. 9) 10) Magnetic domains normally occur in A) silver. B) iron. C) copper. 10) 11) When there is a change in the magnetic field in a closed loop of wire, A) electromagnetic induction occurs. B) current is made to flow in the loop of wire. C) a voltage is induced in the wire. 11) 12) In a longitudinal wave, the compressions and rarefactions travel in A) opposite directions. B) the same direction. C) neither A nor B 12) 13) The vibrations of a transverse wave move in a direction A) along the direction of wave travel. B) at right angles to the direction of wave travel. 13) 14) The Doppler effect is characteristic of A) sound waves. B) light waves. C) water waves. 14) 15) Wave interference occurs for A) water waves. B) light waves. C) sound waves. 15) 16) Which of the following is not a transverse wave? A) light B) sound C) radio 16) 2

3 17) The Doppler effect occurs when a source of sound moves A) toward you. B) away from you. C) both A and B D) none of the above 17) 18) Every proton in the universe is surrounded by its own A) gravitational field. B) electric field. C) both A and B D) none of the above 18) 19) Charge carriers in a metal are electrons rather than protons because electrons are A) loosely bound. B) smaller. C) negative. 19) ESSAY. Write your answer in the space provided or on a separate sheet of paper. 20) What are the similarities and differences between Coulombʹs Law and Newtonʹs Law of gravitation? 21) What is the difference between an insulator and a conductor of electricity? Give examples of each. 22) What is the cause of a magnetic field about a permanent magnet, and about a current -carrying wire? 23) Distinguish between a common bar magnet and an electromagnet. 24) What is the relationship between wave frequency and period? What is the period, in seconds, that corresponds to each of the following frequencies: (a) 10 Hz, (b) 0.2 Hz, (c) 60 Hz? 25) Distinguish between a transverse wave and a longitudinal wave. Give examples of each. 26) Measurements show there is an electric field surrounding Earth. Its magnitude averages 100 N/C at Earthʹs surface and it points inward toward Earthʹs center. From this information, state whether Earth is negatively or positively charged. Defend your answer. 27) What is an electric current, how does it flow in a wire, and about how fast do the electrons move? 28) Distinguish between AC and DC. When you plug a light bulb into a wall socket, where do the electrons come from? 29) What happens to a current-carrying wire in a magnetic field? How does orientation of the wire make a difference? 30) State Faradayʹs Law of Induction and explain what it means. 31) What correction do you make to a friend who states that a step -up transformer boosts energy, while a step-down transformer reduces energy in a circuit. 32) What is the connection, if any, between electromagnetic induction and sunshine? 3

4 33) What is wave interference, and what two types are there? 34) What is an echo, and why is it weaker than the original sound? 35) Why will a struck tuning fork sound louder when it is held against a table? 36) What is the Doppler effect, and how is it produced? Cite two examples. 37) What is resonance and what conditions cause it? Give examples. 38) What is refraction, and how does it occur? 39) Can a particle act like a wave? Can a wave act like a particle? Give examples. 40) Can an electron be set into motion and speeded up by a magnetic field? By an electric field? 4

5 Answer Key Testname: UNTITLED1 1) C 2) B 3) A 4) A 5) B 6) B 7) A 8) A 9) B 10) B 11) D 12) B 13) B 14) D 15) D 16) B 17) C 18) C 19) A 5