Kirchhoffs laws and applications, Wheatstone bridge, metre bridge - Question Bank
1. Which law is fundamentally applied when analyzing the potential drop across resistors in a closed loop according to Kirchhoff's second law?
2. The formula P/Q = R/S for a balanced Wheatstone bridge assumes:
3. In a Wheatstone bridge, if the resistance of one arm is increased significantly, what is the likely effect on the balance condition?
4. If the jockey is moved along the wire in a metre bridge, the resistance of the wire segment changes. This change in resistance causes a change in:
5. The metre bridge is preferred over the Wheatstone bridge for measuring moderate resistances because:
6. A galvanometer with resistance G is connected in series with a Wheatstone bridge. If the bridge is balanced, the current through G is zero. What happens if G is increased?
7. Which of the following is NOT a condition for applying Kirchhoff's laws?
8. In a metre bridge, if the known resistance is R and the balancing length is l, the unknown resistance X is given by X = R * (l / (100 - l)). If R = 50Ω and l = 60 cm, what is X?
9. A galvanometer deflects to the right when current flows in a certain direction. If the galvanometer in a Wheatstone bridge deflects to the right when the jockey is moved towards the right end of the wire, what does this indicate about the potential?
10. Consider a junction with three incoming currents I1, I2, I3 and two outgoing currents I4, I5. Kirchhoff's first law states:
11. In applying Kirchhoff's laws, the choice of direction for current in a loop is:
12. The end resistances of the metre bridge connections can be minimized by:
13. If the unknown resistance in a metre bridge is very high, the balancing length 'l' will be:
14. If the unknown resistance in a metre bridge is very low, the balancing length 'l' will be:
15. Why is a galvanometer used instead of an ammeter in a Wheatstone bridge to detect balance?
16. The resistance wire used in a metre bridge is typically made of:
17. What happens to the current through the galvanometer in a Wheatstone bridge if the battery voltage is increased?
18. In a Wheatstone bridge, if P=3Ω, Q=6Ω, R=4Ω, and S=8Ω, what is the ratio P/Q and R/S?
19. A complex circuit can be simplified and analyzed using:
20. Kirchhoff's loop rule is applicable to:
21. Kirchhoff's junction rule is applicable to:
22. Which component is crucial for detecting the null point in both Wheatstone bridge and metre bridge?
23. If in the metre bridge experiment, the balancing length is found to be very small (e.g., 5 cm), it implies that the unknown resistance is:
24. In a metre bridge experiment, if the jockey is at the 40 cm mark from the left end and the galvanometer shows no deflection, and the known resistance in the right gap is 10Ω, what is the unknown resistance in the left gap?
25. The metre bridge works on the principle of the Wheatstone bridge and is used to determine an unknown resistance by comparing it with:
26. The sensitivity of a Wheatstone bridge is highest when:
27. In a Wheatstone bridge, if the galvanometer shows deflection, it means the bridge is:
28. A Wheatstone bridge circuit has four resistors P, Q, R, and S, and a galvanometer G. If the bridge is balanced, which of the following is true?
29. If we traverse a loop in the opposite direction of the emf source (from positive to negative terminal) while applying Kirchhoff's second law, the emf is taken as:
30. If we traverse a loop in the direction of the emf source (from negative to positive terminal) while applying Kirchhoff's second law, the emf is taken as:
31. When applying Kirchhoff's second law, if we traverse a loop in the opposite direction of the current through a resistor, the potential difference is taken as:
32. When applying Kirchhoff's second law, if we traverse a loop in the direction of the current through a resistor, the potential difference is taken as:
33. In a parallel circuit with branches having resistors R1, R2, and R3, Kirchhoff's first law applied at a junction states that the total current entering the junction is equal to:
34. Consider a circuit with three resistors R1, R2, and R3 connected in series to a battery. According to Kirchhoff's second law, the sum of voltage drops across R1, R2, and R3 will be equal to:
35. Which of the following is a disadvantage of using a metre bridge?
36. A metre bridge is most accurate when the unknown resistance is:
37. If the balancing length for an unknown resistance 'X' in a metre bridge is 'l', and the total length of the wire is 100 cm, the resistance of the wire per unit length is assumed to be uniform. The formula to calculate X is:
38. The jockey in a metre bridge is used to:
39. In a metre bridge experiment, the unknown resistance is placed in:
40. A metre bridge is a practical application of which principle?
41. The condition for a Wheatstone bridge to be balanced is P/Q = R/S, where P, Q, R, and S are resistances. If P=2Ω, Q=4Ω, and R=6Ω, what is the value of S for balance?
42. In a balanced Wheatstone bridge, the current through the galvanometer is:
43. For a Wheatstone bridge to be balanced, the ratio of resistances in the two arms must be:
44. A Wheatstone bridge is used to measure:
45. Which of the following statements best describes Kirchhoff's second law?
46. In Kirchhoff's second law, the algebraic sum of potential differences (voltage drops and rises) around any closed loop in a circuit is:
47. According to Kirchhoff's first law, the algebraic sum of currents entering a junction is equal to:
48. Kirchhoff's second law (loop rule) is a consequence of which fundamental law?
49. Kirchhoff's first law (junction rule) is a consequence of which fundamental law?