Physics B CFA 1 Review Quiz - Trimester 3 2014

29 Questions | By Klt7560 | Updated: Mar 22, 2022 | Attempts: 1177

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Physics B CFA 1 Review Quiz - Trimester 3 2014 - Quiz

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