Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 288 · 40 questions

Remember (Find the topic, use the idea): Find the topic: energy, safety, conductor, closed loop, switches, cells, symbols, series or parallel. Use that lesson’s idea — complete loop, all ON for series, cells add up, one path or many. For sums, write the working and check it again.

1. 1.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic ruler. Does the bulb glow? (a) No (b) Yes
2. 2.🔁 What do we call a circuit with a break in it? (a) a series circuit (b) an open circuit (c) a closed circuit (d) a full circuit
3. 3.🔌 Is a cotton thread a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) a single current path (d) one out, the rest glow
5. 5.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is ON, B is OFF, C is OFF and D is ON. Does the bulb glow? (a) No (b) Yes
6. 6.💡 3 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
7. 7.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a plug top (b) a bulb (c) a long wire (d) a fuse or MCB
8. 8.⚠️ Is it safe to fly a kite near wires? (a) not safe (b) safe
9. 9.💡 5 identical bulbs are joined in series with a 5 V battery (ideal wires). How many volts does each bulb get? =
10. 10.Which of these is safe? (a) throw cells in a fire (b) touch a switch when wet (c) dry your hands first (d) use mains for a project
11. 11.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) each gets the full volts (c) bulbs share the voltage (d) a single current path
12. 12.Which of these uses electricity? (a) a battery (b) an air conditioner (c) a wind turbine (d) a cell
13. 13.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) True (b) False
14. 14.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they explode (c) they get dimmer (d) they keep glowing
15. 15.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
16. 16.True or false: a long and a short line is the symbol for a bulb. (a) True (b) False
17. 17.True or false: a plain rectangle is the symbol for an ammeter. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) use a cable with cuts (b) keep drinks far away (c) use mains for a project (d) touch a fallen wire
19. 19.True or false: “many paths for current” is true of a parallel circuit. (a) True (b) False
20. 20.Which drawing is the symbol for a wire? (a) many long-short pairs (b) a circle with V inside (c) a plain rectangle (d) a straight line
21. 21.Which drawing is the symbol for a voltmeter? (a) a circle with V inside (b) a small empty box (c) a circle with M inside (d) triangle, bar and arrows
22. 22.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a wooden stick across the gap. Does the bulb glow? (a) No (b) Yes
23. 23.💡 5 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 3 and 5 are taken out of their holders. How many bulbs glow?
24. 24.🔋 6 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
25. 25.🔌 Is a paper strip a conductor or an insulator? (a) a conductor (b) an insulator
26. 26.Which of these means the circuit is closed? (a) a wire is cut (b) the switch is ON (c) the bulb is unscrewed (d) the switch is OFF
27. 27.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
28. 28.Which of these is not safe? (a) touch a switch when wet (b) dry your hands first (c) keep drinks far away (d) build with an adult near
29. 29.True or false: if the switch is OFF, the circuit is closed and current flows. (a) False (b) True
30. 30.💡 3 identical bulbs are in parallel and each one takes 0.25 A. What total current (in amperes) comes from the battery? =
31. 31.🔋 What should you do with used-up cells? (a) give them for recycling (b) cut them open (c) bury them in soil (d) throw them in a fire
32. 32.⚠️ About how many volts do home sockets in India supply? (a) 1.5 V (b) 9 V (c) 12 V (d) 230 V
33. 33.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
34. 34.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is ON and C is ON. Does the bulb glow? (a) Yes (b) No
35. 35.🔌 Is a plastic ruler a conductor or an insulator? (a) a conductor (b) an insulator
36. 36.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is ON. Does the bulb glow? (a) Yes (b) No
37. 37.🔍 Which is the odd one out? (a) dry your hands first (b) keep drinks far away (c) build with an adult near (d) touch a switch when wet
38. 38.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
39. 39.True or false: a night lamp mainly gives out light. (a) False (b) True
40. 40.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) not joined (c) by Wi-Fi (d) in parallel

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