Physics Practice: Electricity (Mock Test 4 - Expert Logic)
1. Expert Analysis: In a domestic "Ring System" of wiring, what is the main advantage of having two paths for the current to reach any socket?
2. Clinical Logic: Why are birds able to sit on high-voltage power lines without getting electrocuted?
3. Data-based: An electric iron is rated $750\text{ W, } 250\text{ V}$. The current flowing through it during normal operation is:
4. Experimental Setup: When two charged bodies are connected by a wire, the flow of charge stops when both bodies have the same ________.
5. Which of the following describes the function of a "Commutator" in a DC motor?
6. If three $6\ \Omega$ resistors are connected in parallel, the total resistance of the combination is:
7. Why does a dry cell eventually "die" and stop providing current?
8. In electroplating, the object to be plated is always made the ________.
9. "Specific Resistance" (Resistivity) of a material depends only on its ________.
10. Why is the fuse wire always placed in the live wire and not the neutral wire?
11. A wire is stretched to double its length. Its new resistance will be ________ the original resistance.
12. The safety pin of a 3-pin plug is longer and thicker so that ________.
13. Which of the following describes the "Heating Effect" formula correctly?
14. When two resistors $R_1$ and $R_2$ are in series, the potential difference $V$ is ________.
15. The unit of Electromotive Force (EMF) is ________.
16. Why is a step-up transformer used at power generating stations?
17. Electrolyte used in silver plating is usually ________.
18. The equivalent resistance of a parallel combination is ________ than the smallest resistance in the circuit.
19. If a $60\text{ W}$ bulb and $100\text{ W}$ bulb are connected in series, which one glows brighter?
20. The work done per unit time in an electric circuit is ________.
