# AP Physics Electricity Multiple Choice Questions

The AP Physics Electricity Multiple Choice Questions (MCQ) are as follows:

01. Name the following: ___________ is a combination of various electric circuit elements (components) and sources of e.m.f. connected in a complicated manner.

02. In a closed circuit, there is no current flow between any two equi-potential points. ________ works on this principle.

03. ___________ is used to measure internal resistance of a cell.
05. In Kirchhoff’s Current Law, the Sign Convention is that Current towards junction is considered _________ sign04. True or False: Potentiometer is a device used to measure the emf of a cell or potential difference between two points

06. On what factors does the Internal resistance of a cell depends?

07. In Kirchhoff’s Voltage Law, the Sign Convention is that the Potential Difference (PD) across Resistances in the direction of current, is considered _______ sign

08. Kirchhoff’s 1st Law supports Conservation of ____________

09. True or False: Potentiometer has low accuracy, while Voltmeter has high accuracy

10. Why Jockey is tapped and not slided when using meter-bridge?

11. True or False: Potentiometer has low sensitivity, while Voltmeter has high sensitivity

12. Junction: It is any point in the circuit where the electric current can ______

13. Name the Law: The algebraic sum of potential difference (product of current and resistance) and electromotive force (emf) applied in a closed loop of electrical network is zero. [ΣIR + ΣE = 0]

14. __________ works on the principle of null deflection.

15. Name the Law: So long as the physical state of the conductor (length, area of cross-section and temperature) remains constant, the current passing through the conductor (I) is directly proportional to the potential difference (V) applied between the ends of the conductor.

16. Precautions when using potentiometers: EMF of the battery must be _______ than unknown EMF of cell {for sum & difference method}

17. What are the sources of errors when using meter-bridge?

18. One of the precautions when using potentiometers is that the positive of cell of unknown emf should be connected to that end to which ____________ terminal of battery is connected

19. True or False: In Kirchhoff’s Voltage Law, the Sign Convention for Potential Difference (PD) across Resistances in the direction opposite direction of current is taken as positive sign

20. Kirchhoff’s 2nd Law supports Conservation of __________

21. To eliminate Contact resistance, null point is obtained within ______ 1/3rd, so that lx and lR are both large.

22. Why is potentiometer called ideal voltmeter?

23. In a ___________ Network, Current through Galvanometer is zero

24. _____________of the material of the conductor is defined as resistance of that conductor having unit length and unit area of cross-section

25. Which of the two Kirchhoff’s Laws, can be used in both open and closed circuits.

26. To measure small potential difference such as EMF developed in a thermocouple, _______ is used.

27. Name the Law: The algebraic sum of electric currents at any junction is equal to zero [ΣI = 0]

28. In Kirchhoff’s Voltage Law, the Sign Convention is that the EMF from positive to negative terminal, is considered _______ sign

29. The reciprocal of resistivity is called ___________

30. Kirchhoff’s 2nd Law is also called as 2nd Law, Voltage Law, Loop Law or ________ Law

## Answers: AP Physics Electricity Multiple Choice Questions

01. Electrical Network
02. Wheatstone’s meter bridge
03. Potentiometer
04. True
05. Positive
06. 1. nature of electrolyte, 2. distance between electrodes, 3. area of electrodes dipped in electrolyte and 4. temperature of electrolyte
07. Negative
08. Charge
09. False {Its other way round}
10. Due to sliding of jockey, heat is produced due to friction, which changes the resistance of wire. To eliminate this source of error, Jockey is tapped.
11. False {Its other way round}
12. split, combine
13. Kirchhoff’s Second Law (Voltage Law) (Loop Theorem)
14. Potentiometer
15. Ohm’s Law
16. Greater
17. Non-uniformity of wire, Contact resistance, Non-exact coincidence of scale, Sliding of jockey, Heating effect of cell current, Resistances of copper strip & connecting wires
18. positive
19. True
20. Energy
21. middle {i.e 33.33 cm to 66.67 cm}
22. Potentiometer can measure very small PD. Sensitivity is greater. Potentiometer never draws current from the cell whose emf is to be measured
23. Balanced
24. Specific Resistance (ρ)
25. Kirchhoff’s 1st Law
26. Potentiometer
27. Kirchhoff’s First Law (Current Law) (Junction Law)
28. Negative
29. Conductivity (σ)
30. Mesh