Physics B CFA 1 Review Quiz - Trimester 3 2014

29 Questions | Total Attempts: 907  Settings  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.

• 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.

• 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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