Online Quiz: Gibilisco - CHAPTER 8 MCQs

Online Quiz:CHAPTER 8 - Magnetism

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Online Quiz: Gibilisco - CHAPTER 7 MCQs

Online Quiz:CHAPTER 7 - Cells and Batteries

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Online Quiz: Gibilisco - CHAPTER 6 MCQs

Online Quiz:CHAPTER 6 - Resistors

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Online Quiz: Gibilisco - CHAPTER 5 MCQs

Online Quiz:CHAPTER 5 Direct Current Circuit Analysis

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Online Quiz: Gibilisco - CHAPTER 4 MCQs

Online Quiz:CHAPTER 4 Basic DC Circuits

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Online Quiz: Gibilisco - CHAPTER 3 MCQs

Online Quiz:CHAPTER 3 Measuring Devices

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Online Quiz: Gibilisco - CHAPTER 2 MCQs

Online Quiz:CHAPTER 2 Electrical Units

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Answers key: Gibilisco - CHAPTER 1 MCQs

Explanations for the Answers in Chapter 1: Basic Physical Concept Quiz

• 1. An electrically neutral atom has no net electric charge, so the number of positively charged particles (protons) must equal the number of negatively charged particles (electrons). The correct answer is (c).
• 2. This question contains a distraction! The correct answer is (a). By definition, the atomic number of any atom, whether neutral or not, equals the number of protons in its nucleus.
• 3. Once again, I've inserted a distraction. The correct answer is (d). That's how we define atomic weight for any atom, electrically neutral or otherwise.
• 4. When an atom has an electric charge, we call it an ion. By definition, a positive ion is a cation. The correct answer is (b).
• 5. A carbon atom always has six protons, so we can rule out (c) and (d) straightaway. In the chapter text, we identify two different isotopes of carbon. One isotope (C12) has six neutrons, and the other (C14) has eight neutrons. The correct answer is (a).
• 6. The correct answer is (c), because we define a two-atom molecule as diatomic. Some molecules, such as O₂, have two atoms, so we can rule out (a). Molecules can have electric charge because they, like atoms, can have an excess or deficiency of electrons, so we can rule out (b). The number of protons in a molecule need not equal the number of neutrons (and often doesn't), so we can rule out (d).
• 7. A compound always contains two or more atoms. A monatomic element has single atoms (meaning that none of its atoms are bound to any other atoms) by definition, so we'll never encounter a monatomic compound. The correct answer is (a).
• 8. When a substance becomes ionized, its atoms acquire extra electrons or lose some of their electrons. The nucleus doesn't change at all. In the chapter text, we learned that ionization sometimes makes poor conductors into good conductors, so the correct answer is (a).
• 9. In the chapter text, we learned that pure elemental silver is the best known electrical conductor. The correct answer is (d).
• 10. The correct answer is (b). In the chapter text, we learned that in most gases, the atoms are too widely separated to allow for the easy passage of electrons from atom to atom. You might think that (c) is also correct, but it isn't. The electrons certainly do move in a gas! They "orbit" their "parent nuclei" at great speed (as they do in all atoms), even though they don't readily move from one atomic nucleus to another.
• 11. In the chapter text, we learned that if we impose a potential difference of 1 V across a component having a resistance of 1 ohm, we get 1 A of current. We also learned that if we double the voltage across a component whose resistance remains constant, we double the current. Therefore, the correct answer is (c).
• 12. Once again, if we double the voltage but leave the resistance unchanged, we double the current. The correct answer is (c).
• 13. We can define a hole as a place where we would normally expect to find an electron, but for some reason the electron isn't there. Holes don't have anything to do with protons, neutrons, or the existence of electron shells. The correct answer is therefore (a).
• 14. The correct answer is (a). All good conductors have low resistance. Answer (d) doesn't work, because no conductor exhibits zero resistance in the "real world." Answer (b) is absolutely wrong! You might feel the temptation to choose (c), but that statement applies to semiconductors, not to good conductors in general.
• 15. The number of electrical charge carriers on an object constitutes the quantity of its charge. We express that parameter in coulombs, so the correct answer is (d).
• 16. When a lightning stroke occurs, a potential difference is equalized by a flow of electrons from atom to atom through ionized air. The general direction of electron movement is away from the negative pole and toward the positive pole. The correct answer is (b).
• 17. The chapter text tells us that engineers express resistance in ohms. As the value in ohms increases, so does the resistance. The correct answer is (d).
• 18. A battery stores chemical energy. If we connect a component across the battery terminals so that current flows, the battery converts chemical energy to electrical energy. The correct answer is (b). Generators convert mechanical energy to electrical energy, so (a) is wrong. Motors convert electrical energy to mechanical energy, so (c) doesn't work. Obviously, answer (d) is wrong then!
• 19. A generator converts mechanical energy to electrical energy, so the correct answer is (a). Batteries convert chemical energy to electrical energy, so (b) is wrong. Motors convert electrical energy to mechanical energy, so (c) is wrong. Answer (d) is of course wrong because we've already found that answer (a) works.
• 20. No generator, battery, or motor can convert electrons into protons, so the correct answer is (d). Nobody has ever built a device that can change an electron directly into a proton.

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Online Quiz: Gibilisco - CHAPTER 1 MCQs

Online Quiz:CHAPTER 1 Basic Physical Concept

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Gibilisco: CHAPTER 1 MCQs

Topic:CHAPTER 1 Basic Physical Concept

1. The atomic number of an element is determined by:

• A. The number of neutrons.
• B. The number of protons.
• C. The number of neutrons plus the number of protons.
• D. The number of electrons.

2. The atomic weight of an element is approximately determined by:

• A. The number of neutrons.
• B. The number of protons.
• C. The number of neutrons plus the number of protons.
• D. The number of electrons.

3. Suppose there is an atom of oxygen, containing eight protons and eight neutrons in the nucleus, and two neutrons are added to the nucleus. The resulting atomic weight is about:

• A. 8.
• B. 10.
• C. 16.
• D. 18.

4. An ion:

• A. Is electrically neutral.
• B. Has positive electric charge.
• C. Has negative electric charge.
• D. Might have either a positive or negative charge.

5. An isotope:

• A. Is electrically neutral.
• B. Has positive electric charge.
• C. Has negative electric charge.
• D. Might have either a positive or negative charge.

6. A molecule:

• A. Might consist of just a single atom of an element.
• B. Must always contain two or more elements.
• C. Always has two or more atoms.
• D. Is always electrically charged.

7. In a compound:

• A. There can be just a single atom of an element.
• B. There must always be two or more elements.
• C. The atoms are mixed in with each other but not joined.
• D. There is always a shortage of electrons.

8. An electrical insulator can be made a conductor:

• A. By heating.
• B. By cooling.
• C. By ionizing.
• D. By oxidizing.

9. Of the following substances, the worst conductor is:

• A. Air.
• B. Copper.
• C. Iron.
• D. Salt water.

10. Of the following substances, the best conductor is:

• A. Air.
• B. Copper.
• C. Iron.
• D. Salt water.

11. Movement of holes in a semiconductor:

• A. Is like a flow of electrons in the same direction.
• B. Is possible only if the current is high enough.
• C. Results in a certain amount of electric current.
• D. Causes the material to stop conducting.

12. If a material has low resistance:

• A. It is a good conductor.
• B. It is a poor conductor.
• C. The current flows mainly in the form of holes.
• D. Current can flow only in one direction.

13. A coulomb:

• A. Represents a current of one ampere.
• B. Flows through a 100-watt light bulb.
• C. Is one ampere per second.
• D. Is an extremely large number of charge carriers.

14. A stroke of lightning:

• A. Is caused by a movement of holes in an insulator.
• B. Has a very low current.
• C. Is a discharge of static electricity.
• D. Builds up between clouds.

15. The volt is the standard unit of:

• A. Current.
• B. Charge.
• C. Electromotive force.
• D. Resistance.

16. If an EMF of one volt is placed across a resistance of two ohms, then the current is:

• A. Half an ampere.
• B. One ampere.
• C. Two amperes.
• D. One ohm.

17. A backwards-working electric motor is best described as:

• A. An inefficient, energy-wasting device.
• B. A motor with the voltage connected the wrong way.
• C. An electric generator.
• D. A magnetic-field generator.

18. In some batteries, chemical energy can be replenished by:

• A. Connecting it to a light bulb.
• B. Charging it.
• C. Discharging it.
• D. No means known; when a battery is dead, you have to throw it away.

19. A changing magnetic field:

• A. Produces an electric current in an insulator.
• B. Magnetizes the earth.
• C. Produces a fluctuating electric field.
• D. Results from a steady electric current.

20. Light is converted into electricity:

• A. In a dry cell.
• B. In a wet cell.
• C. In an incandescent bulb.
• D. In a photovoltaic cell.

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Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

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Applied Physics Lecture: Fluids

Lesson Objectives - the students should be able to:

• Distinguish between density, weight density, and specific gravity and given an object's mass and volume, calculate the object's density, weight density, and specific gravity.
• Define pressure and calculate the pressure that an object of known weight exerts on a surface of known area and express the magnitude of the pressure in psi, lb/ft², N/m², or pascals (Pa).
• Calculate the pressure acting at a depth h below the surface of a liquid of density (ρ).
• Distinguish between absolute pressure and gauge pressure and solve problems involving each type of pressure.
• State Pascal's Principle and apply this principle to basic hydraulic systems.
• State Archimedes Principle and use this principle to solve problems related to buoyancy.
• Explain what is meant by streamline flow, the equation of continuity, and the flow rate. Apply these concepts to word problems to solve for the velocity of water at a particular point in a closed pipe.
• Use Bernoulli's equation and the concept of streamline flow to solve for the velocity of a fluid and/or the pressure exerted by a fluid at a particular point in a closed pipe.

Lecture on Fluids PPT

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• Applied Physics Course Outline

Summary of Chapter 10

• Phases of matter: solid, liquid, gas.
• Liquids and gases are called fluids.
• Density is mass per unit volume.
• Specific gravity is the ratio of the density of the material to that of water.
• Pressure is force per unit area.
• Pressure at a depth h is ρgh.
• External pressure applied to a confined fluid is transmitted throughout the fluid.
• Atmospheric pressure is measured with a barometer.
• Gauge pressure is the total pressure minus the atmospheric pressure.
• An object submerged partly or wholly in a fluid is buoyed up by a force equal to the weight of the fluid it displaces.
• Fluid flow can be laminar or turbulent.
• The product of the cross-sectional area and the speed is constant for horizontal flow.
• Where the velocity of a fluid is high, the pressure is low, and vice versa.
• Viscosity is an internal frictional force within fluids.
• Liquid surfaces hold together as if under tension.

Units of Chapter 10 - Keywords

• Density and Specific GravityDensity and Specific Gravity
• Density and Specific Gravity
• Pressure in Fluids
• Atmospheric Pressure and Gauge Pressure
• Pascal’s Principle
• Measurement of Pressure; Gauges and the Barometer
• Buoyancy and Archimedes’ Principle
• Fluids in Motion; Flow Rate and the Equation of Continuity
• Bernoulli’s Equation
• Applications of Bernoulli’s Principle: from Torricelli to Airplanes, Baseballs, and TIA
• Viscosity
• Flow in Tubes: Poiseuille’s Equation, Blood Flow
• Surface Tension and Capillarity
• Pumps, and the Heart

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Applied Physics Lecture: Electric Currents

Lesson Objectives - the students should be able to:

• Explain how a simple battery can produce an electrical current.
• Define current, ampere, emf, voltage, resistance, resistivity, and temperature coefficient of resistance.
• Write the symbols used for electromotive force, electric current, resistance, resistivity, temperature coefficient of resistance and power and state the unit associated with each quantity.
• Distinguish between a) conventional current and electron current and b) direct current and alternating current.
• Know the symbols used to represent a source of emf, resistor, voltmeter, and ammeter and how to interpret a simple circuit diagram.
• Given the length, cross sectional area, resistivity, and temperature coefficient of resistance, determine a wire's resistance at room temperature and some higher or lower temperature.
• Solve simple dc circuit problems using Ohm's law.
• Use the equations for electric power to determine the power and energy dissipated in a resistor and calculate the cost of this energy to the consumer.
• Distinguish between the rms and peak values for current and voltage and apply these concepts in solving problems involving a simple ac circuit.
• Compute Power in Household Circuits
• Understand the Microscopic View of Electric Current
• Learn the concept of Superconductivity
• Could understand the Electrical Conduction in the Human Nervous System

Lecture on Electric Currents PPT

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• Applied Physics Course Outline

Summary of Chapter 18

• A battery is a source of constant potential difference.
• Electric current is the rate of flow of electric charge.
• Conventional current is in the direction that positive charge would flow.
• Resistance is the ratio of voltage to current:
  
  
• Ohmic materials have constant resistance, independent of voltage.
• Resistance is determined by shape and material:
  
  
• ρ is the resistivity.
• Power in an electric circuit:
  
  
• Direct current is constant
• Alternating current varies sinusoidally
  
  
• The average (rms) current and voltage:
  
  
• Relation between drift speed and current:
  
  

Units of Chapter 18 - Keywords

• The Electric Battery
• Electric Current
• Ohm’s Law: Resistance and Resistors
• Resistivity
• Electric Power
• Power in Household Circuits
• Alternating Current
• Microscopic View of Electric Current
• Superconductivity
• Electrical Conduction in the Human Nervous System
• Volta
• electrolyte

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Applied Physics Lecture: Electric Potential

Lesson Objectives - the students should be able to:

• Write from memory the definitions of electric potential, and electric potential difference.
• Distinguish between electric potential, electric potential energy, and electric potential difference.
• Draw the electric field pattern and equipotential line pattern which exist between charged objects.
• Determine the magnitude of the potential at a point a known distance from a point charge or an arrangement of point charges.
• State the relationship between electric potential and electric field and determine the potential difference between two points a fixed distance apart in a region where the electric field is uniform.
• Determine the kinetic energy in both joules and electron volts of a charged particle which is accelerated through a given potential difference.
• Explain what is meant by an electric dipole and determine the magnitude of the electric dipole moment between two point charges.
• Given the dimensions, distance between the plates, and the dielectric constant of the material between the plates, determine the magnitude of the capacitance of a parallel plate capacitor.
• Given the capacitance, the dielectric constant, and either the potential difference or the charge stored on the plates of a parallel plate capacitor, determine the energy and the energy density stored in the capacitor.
• Understand the functions and operations of Cathode Ray Tube: TV and Computer Monitors, Oscilloscope
• Know The Electrocardiogram (ECG or EKG)

Lecture on Electric Potential PPT

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• Applied Physics Course Outline

Summary of Chapter 17

• Electric potential energy:
  
  
• Electric potential difference: work done to move charge from one point to another
• Relationship between potential difference and field:
  
  
• Equipotential: line or surface along which potential is the same
• Electric potential of a point charge:
  
  
• Electric dipole potential:
  
  
• Capacitor: nontouching conductors carrying equal and opposite charge
• Capacitance:
  
  
• Capacitance of a parallel-plate capacitor:
  
  
• A dielectric is an insulator
• Dielectric constant gives ratio of total field to external field
• Energy density in electric field:
  
  

Units of Chapter 17 - Keywords

• Electric Potential Energy and Potential Difference
• Relation between Electric Potential and Electric Field
• Equipotential Lines
• The Electron Volt, a Unit of Energy
• Electric Potential Due to Point Charges
• Potential Due to Electric Dipole; Dipole Moment
• Capacitance
• Dielectrics
• Storage of Electric Energy
• Cathode Ray Tube: TV and Computer Monitors, Oscilloscope
• The Electrocardiogram (ECG or EKG)

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