Physics B CFA 1 Review Quiz - Trimester 3 2014

29 Questions | Total Attempts: 907

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Physics B CFA 1 Review Quiz - Trimester 3 2014

This is the review quiz for the Physics B CFA 1. Please take and review answers at the end. You may take this quiz unlimited amount of times until a passing score is achieved. You will be given a test grade for this quiz; therefore please retake until you reach a score of 90% or above.


Questions and Answers
  • 1. 
    1.         A 24Ω resistor is connected to a 12-V battery. How much current flows through   the resistor?             (Hint: V = I x R) Ohms Law.
    • A. 

      A. 0.50 A

    • B. 

      B. 2.0 A

    • C. 

      C. 6.0A

    • D. 

      D. 288 A

  • 2. 
    2.         A 24Ω resistor is connected to a 12-V battery. How much power is used by the    resistor?           (Hint: P=V2/R)
    • A. 

      A. 0.5 W

    • B. 

      B. 2.0 W

    • C. 

      C. 6.0 W

    • D. 

      D. 288 W

  • 3. 
    3.         Three resistors, 5.0 Ω, 255 Ω and 55 Ω, are connected in series wth each other       and in series with a 12battery. How much current flows from the battery?              (Hint: Series - R = R1 + R2 + R3) V = I x R
    • A. 

      A. 2.7 A

    • B. 

      B. 38 mA

    • C. 

      C. 47 mA

    • D. 

      D. 0.21 A

  • 4. 
    4.         What is the equivalent resistance parallel combination of 12 Ω, 6.0 Ω and a 25  Ω resistor?               (Hint: Parallel - 1/R = (1/R1) + (1/R2) + (1/R3))
    • A. 

      A. 0.26 Ω

    • B. 

      B. 11 Ω

    • C. 

      C. 43 Ω

    • D. 

      D. 3.4 Ω

  • 5. 
    9. The excerpt shown is part of a Safety Officer’s report on how electrical items were being used in the house. *************** “ The hair dryer had a plastic with double insulation, so the live and neutral leads were insulated within the plug. When not in use, the dryer was kept in a metal cabinet but taken into the bathroom to be used.” ***************
    • A. 

      A. plastic with double insulation

    • B. 

      B. only the live and neutral leads were connected to the plug

    • C. 

      C. kept in a metal cabinet

    • D. 

      D. taken into the bathroom to be used

  • 6. 
    The diagram below represents a circuit consisting of two resistors connected to a source of potential difference. 10. What is the current through the 20.-ohm resistor?
    • A. 

      (a) 0.25 A

    • B. 

      (b) 6.0 A

    • C. 

      (c) 12 A

    • D. 

      (d) 4.0 A

  • 7. 
    In a simple electric circuit, a 24-ohm resistor is connected across a 6.0-volt battery. What is the current in the circuit? (Hint: V = I x R)
    • A. 

      (a) 1.0 A

    • B. 

      (b) 0.25 A

    • C. 

      (c) 140 A

    • D. 

      (d) 4.0 A

  • 8. 
    12. The resistance of the conductor is   (Hint: V = I x R)
    • A. 

      (a) 1.0 W

    • B. 

      (b) 2.0 W

    • C. 

      (c) 0.50 W

    • D. 

      (d) 4.0 W

  • 9. 
    The circuit diagram below represents four resistors connected to a 12-volt source. 13. What is the total current in the circuit?   (Hint: Resistors are in series; V = I x R)
    • A. 

      (a) 0.50 A

    • B. 

      (b) 2.0 A

    • C. 

      (c) 8.6 A

    • D. 

      (d) 24 A

  • 10. 
    14. Which combination of resistors has the smallest equivalent resistance?
    • A. 

      (a) 1

    • B. 

      (b) 2

    • C. 

      (c) 3

    • D. 

      (d) 4

  • 11. 
    15. When the distance between two charges is halved, what happens to the electrical force between the charges?             (Hint: Coulombs Law)  r is distance
    • A. 

      a. quadruples

    • B. 

      B. doubles

    • C. 

      C. halves

    • D. 

      D. reduces by ¼

  • 12. 
    16. Which circuit has the smallest equivalent resistance? 
    • A. 

      (c) 1

    • B. 

      (c) 2

    • C. 

      (c) 3

    • D. 

      (c) 4

  • 13. 
    1. A student creates identical electrical charges on identical balloons by rubbing them with a wool cloth. The balloons repel each other. According to Coulomb's Law, which should the student do to increase the electrical force of repulsion between these balloons?  
    • A. 

      Increase the distance between the balloons

    • B. 

      Increase the charge on one of the balloons

    • C. 

      Increase the volume of one of the balloons

    • D. 

      Increase the masses of the balloons

  • 14. 
    3. Coulomb’s law for electric charges relates type, size, and distance between the charges to the force on each charge. Consider the following situation: Equal and opposite charges are placed on identical insulated objects at a fixed distance apart. If the charge on one object is doubled, what will be the resultant force on that object compared to its original force F?
    • A. 

      A. ½ F

    • B. 

      B. F

    • C. 

      C. 2F

    • D. 

      D. 4F

  • 15. 
    5. In electrostatic experiments, why is the charged rod used always as an insulator?    
    • A. 

      A. Conductors cannot be charged.

    • B. 

      B. A charged conductor is too easily discharged by touching.

    • C. 

      C. Charges on conductors do not radiate electric fields thus attracting objects.

    • D. 

      D. Conducting rods are used in electrostatic experiments just like insulator rods.

  • 16. 
    10. In the water flow analogy, the current in a circuit is analogous to —  
    • A. 

      F. the water pipes

    • B. 

      G. the water pump

    • C. 

      H. the on-off valve

    • D. 

      J. the water

  • 17. 
    11. Which of the following is generally the most dangerous aspect of electricity?  
    • A. 

      A. high voltage

    • B. 

      B. high current

    • C. 

      C. high resistance

    • D. 

      D. high power

  • 18. 
    12. One light bulb in the kitchen burns out and suddenly several lights go out in the house. This would provide evidence that the bulbs were wired in—  
    • A. 

      F. a series

    • B. 

      G. parallel

    • C. 

      H. reverse

    • D. 

      J. different circuits

  • 19. 
    6. A capacitor is a device that can store electric charges. In a common design, charge is conducted to non-touching parallel plates where it is stored for use later. In order to move a charge in and out of the capacitor plates they must be what type of material?  
    • A. 

      F. conductive material

    • B. 

      G. insulative material

    • C. 

      H. semi-conductive material

    • D. 

      J. optical material

  • 20. 
    7. Which of the following materials is it most difficult for electrons to flow through?  
    • A. 

      A. silicon

    • B. 

      B. gold

    • C. 

      C. glass

    • D. 

      D. salt water

  • 21. 
    13. These numbers represent the power rating of normal household bulbs. Which has the least resistance?   (Hint: P = V^2/R)
    • A. 

      A. 40 Watt

    • B. 

      B. 100 Watt

    • C. 

      C. 150 Watt

    • D. 

      D. 200 Watt

  • 22. 
    16. Voltmeters are used to measure the potential difference across circuit components such as resistors. Voltmeters have ________ resistance and are placed in ____________ with the resistor.  
    • A. 

      F. high, parallel

    • B. 

      G. high, series

    • C. 

      H. low, parallel

    • D. 

      J. low, series

  • 23. 
    14. Which of the following is a poor conductor of electricity?  
    • A. 

      F. aluminum

    • B. 

      G. copper

    • C. 

      H. gold

    • D. 

      J. glass

  • 24. 
    15. In order to avoid being shocked when working with live circuits, you should only touch-   
    • A. 

      A. insulated switches

    • B. 

      B. resistors

    • C. 

      C. bare wires

    • D. 

      D. power supply terminals

  • 25. 
    18. Which of the following forces between two objects can be attractive?        I.         Gravitational force   II.         Electrostatic force III.         Magnetic force  
    • A. 

      F. I

    • B. 

      G. II

    • C. 

      H. I, II, and III

    • D. 

      J. II and III

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