Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 696 · 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.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a mains extension board (c) an inverter socket (d) a small battery pack
2. 2.🔘 A bulb and a cell are joined through 6 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
3. 3.🔋 How many volts does one ordinary torch cell give? (a) 0.5 V (b) 15 V (c) 230 V (d) 1.5 V
4. 4.🔦 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 metal paper clip. Does the bulb glow? (a) Yes (b) No
5. 5.⚠️ Who should be with you when you build a circuit? (a) a stranger online (b) a trusted adult (c) nobody (d) a younger child
6. 6.Which of these is safe? (a) use small battery cells (b) touch a switch when wet (c) open a phone charger (d) use mains for a project
7. 7.True or false: a long and a short line is the symbol for a capacitor. (a) False (b) True
8. 8.🔌 Is a brass key a conductor or an insulator? (a) a conductor (b) an insulator
9. 9.What does a reed switch do? (a) stays where you flip it (b) springs back when let go (c) closes near a magnet (d) flips up or down
10. 10.🔋 A 12 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
11. 11.True or false: a night lamp mainly gives out light. (a) False (b) True
12. 12.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
13. 13.True or false: a tube light mainly makes sound. (a) False (b) True
14. 14.⚡ A cell changes stored chemical energy into which kind of energy? (a) nuclear energy (b) wind energy (c) electrical energy (d) sound energy
15. 15.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
16. 16.💡 4 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
17. 17.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. How many bulbs glow?
18. 18.🔋 Does a generator give electricity or use electricity? (a) gives electricity (b) uses electricity
19. 19.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) none (b) only one (c) both of them (d) it does not matter
20. 20.💡 6 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 6 are taken out of their holders. How many bulbs glow?
21. 21.🔦 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
22. 22.⚡ What does a table fan mainly change electricity into? (a) sound (b) movement (c) light (d) heat
23. 23.Which of these is safe? (a) throw cells in a fire (b) dry your hands first (c) poke things in a socket (d) climb an electric pole
24. 24.Which of these is true of a parallel circuit? (a) own switch for each bulb (b) a break stops every bulb (c) a single current path (d) one bulb out, all go out
25. 25.🔋 Cells joined + to − in a row (series) give … (a) no voltage (b) a bigger voltage (c) the same voltage (d) a smaller voltage
26. 26.Which of these mainly gives out heat? (a) an electric iron (b) a doorbell (c) an electric toy car (d) an exhaust fan
27. 27.True or false: a graphite rod is a conductor. (a) False (b) True
28. 28.🔘 Which kind of switch works only while pressed? (a) a push button (b) a reed switch (c) a slide switch (d) a toggle switch
29. 29.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
30. 30.Which of these is safe? (a) touch a switch when wet (b) fly a kite near wires (c) build with an adult near (d) poke things in a socket
31. 31.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) an open circuit (b) a parallel circuit (c) a safe circuit (d) a short circuit
32. 32.True or false: to dry your hands first is safe. (a) False (b) True
33. 33.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a plug top (c) a fuse or MCB (d) a long wire
34. 34.💡 5 identical bulbs are joined in series with a 15 V battery (ideal wires). How many volts does each bulb get? =
35. 35.🔘 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 ON, C is OFF and D is OFF. Does the bulb glow? (a) No (b) Yes
36. 36.True or false: a plain rectangle is the symbol for a cell. (a) False (b) True
37. 37.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) each gets full voltage (d) so all go off together
38. 38.Which drawing is the symbol for a diode? (a) a circle with A inside (b) triangle against a bar (c) two or more cell symbols (d) a long and a short line
39. 39.True or false: a toggle switch stays where you flip it. (a) False (b) True
40. 40.🔋 5 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =

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