Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 170 · 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 of these mainly gives out light? (a) a rice cooker (b) a toaster (c) a street light (d) a doorbell
2. 2.Which of these is an insulator? (a) a copper wire (b) a graphite rod (c) a paper strip (d) a safety pin
3. 3.Which of these is an insulator? (a) aluminium foil (b) a brass key (c) a metal paper clip (d) a dry cork
4. 4.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) False (b) True
5. 5.True or false: “a break stops every bulb” is true of a series circuit. (a) False (b) True
6. 6.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a safety pin. Does the bulb glow? (a) No (b) Yes
7. 7.🔍 Which is the odd one out? (a) a brass key (b) a graphite rod (c) a steel coin (d) a cotton thread
8. 8.⚠️ Who should be with you when you build a circuit? (a) a younger child (b) a trusted adult (c) a stranger online (d) nobody
9. 9.⚠️ Is it safe to touch a switch when wet? (a) safe (b) not safe
10. 10.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) it does not matter (c) none (d) only one
11. 11.🔋 6 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
12. 12.🔍 Which is the odd one out? (a) a tube light (b) a siren (c) a street light (d) an LED lamp
13. 13.🔌 Which metal is used for most electric wires at home? (a) glass (b) rubber (c) plastic (d) copper
14. 14.🔘 A bulb and a cell are joined through 4 switches on 4 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
15. 15.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
16. 16.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
17. 17.🔘 Which kind of switch closes near a magnet? (a) a reed switch (b) a toggle switch (c) a tilt switch (d) a slide switch
18. 18.🔍 Which is the odd one out? (a) a steel coin (b) a brass key (c) an iron nail (d) a dry cork
19. 19.⚠️ Is it safe to open a phone charger? (a) not safe (b) safe
20. 20.💡 4 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
21. 21.True or false: “a single current path” is true of a parallel circuit. (a) True (b) False
22. 22.What does a slide switch do? (a) flips up or down (b) works only while pressed (c) closes when tipped over (d) slides side to side
23. 23.True or false: to touch a switch when wet is not safe. (a) False (b) True
24. 24.True or false: a rice cooker mainly gives out heat. (a) False (b) True
25. 25.Which of these is safe? (a) poke things in a socket (b) throw cells in a fire (c) climb an electric pole (d) dry your hands first
26. 26.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in parallel (c) in series (d) not joined
27. 27.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
28. 28.Which of these is true of a parallel circuit? (a) many paths for current (b) bulbs share the voltage (c) one bulb out, all go out (d) a break stops every bulb
29. 29.⚠️ Which power source should children use for electronics projects? (a) an inverter socket (b) a small battery pack (c) a wall socket (d) a mains extension board
30. 30.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) when either is ON (c) only when both are OFF (d) never
31. 31.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a cell is taken out (c) all wires are joined (d) the switch is OFF
32. 32.Which of these is an insulator? (a) a steel coin (b) a copper wire (c) a woollen thread (d) an iron nail
33. 33.Which drawing is the symbol for an ammeter? (a) a long and a short line (b) a circle with A inside (c) a circle with a cross (d) a straight line
34. 34.🔋 5 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
35. 35.🔘 When a switch is ON, the circuit is … (a) open (b) cut (c) broken (d) closed
36. 36.True or false: a circle with M inside is the symbol for a capacitor. (a) True (b) False
37. 37.💡 2 identical bulbs are in parallel and each one takes 0.5 A. What total current (in amperes) comes from the battery? =
38. 38.🔋 What should you do with used-up cells? (a) bury them in soil (b) cut them open (c) give them for recycling (d) throw them in a fire
39. 39.True or false: if a wire is cut, the circuit is closed and current flows. (a) False (b) True
40. 40.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)

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