VVI QUESTIONS (ELECTRICITY AND MAGNETISM)

1. Define electric circuit. What is the unit of electricity consumption?
2. Draw a daigram of circuit having 3 bulbs connected in parallel with a cell and switch. Write two advantages of such connection.
3. How are the loads connected in domestic wiring? Give two advantages of this type of connection of loads.
4. Which element is used to make main switch box in a domestic wlectric circuit, why?
5. What is fuse? Why is it connected in a live wire? What is it made up of?
6. Define short circuit.
7. Differentiate between AC and DC.
8. What do you mean by the frequency of electricity is 50 Hz?
9. Relate current, p.d and power with formula.
10.Differentiate between fuse wire and phase wire.
11. Define overloading.
12. Write any two characteristics of a fuse wire.
13.Why is 220v marked in most electrical appliances?
14. Why is MCB better than fuse? What does MCB stands for?
15. Define neutral wire.
16. Calculate the energy consumption of one day when 5 tube lights of 40 watt each are run five hours a day.
17. 10 bulbs of 60 watt each and two heaters of 1500 watt each are used for two hours daily. Find the unit of electricity consumed in 30 days.
18. What is lightening effect of current?
19.What is filament? Which metal is used for filaments? Why?
19. Why is tungsten filament used in elwctric bulb?
20. Differentiate a filament  lamp and a fluorescent lamp.
21. Why is nitrogen and inert gas filled in a filament lamp?
22. Nichrome wire is used as a heating element, why?
23. A fluorescent lamp of 60 watt glows brightly than a filament lamp of same power, why?
24. What does CFL stands for?
25. Define magnetic effect of current. Who discovered it?
26. What is electromagnetic induction? Write its use.
27. Define motor effect and transformer.
28. Differentiate between step up and step down transformer with examples. What is used to laminate their cores?
29. Why is the core of transformer laminated?
30. Differentiate between a generator and an electric motor.
31. On what principle is transformer based?
32.  On what effect of electricity  an electric bell based?
33. What is the principle of dynamo?
34. What is a solenoid?
35. A coil made up of insulated copper wire is connected to a galvanometer. What will happen to the deflection in the galvanometer if this coil is moved towards a stationary bar magnet and then moved away from it? Give reason. Name the phenomenon involved.