Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 808 · 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.⚡ What does a traffic signal mainly change electricity into? (a) movement (b) sound (c) heat (d) light
2. 2.🔍 Which is the odd one out? (a) a wooden stick (b) a safety pin (c) a paper strip (d) a woollen thread
3. 3.💡 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 1 and 3 are taken out of their holders. How many bulbs glow?
4. 4.💡 In a series circuit, how many paths does the current have? (a) one (b) none (c) two (d) one for each bulb
5. 5.⚠️ Is it safe to throw cells in a fire? (a) not safe (b) safe
6. 6.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a single current path (c) each gets the full volts (d) bulbs share the voltage
7. 7.💡 4 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
8. 8.🔍 Which is the odd one out? (a) use mains for a project (b) fly a kite near wires (c) touch a switch when wet (d) build with an adult near
9. 9.💡 4 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
10. 10.💡 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
11. 11.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
12. 12.True or false: on a cell, “the flat end” means the − (negative) end. (a) False (b) True
13. 13.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
14. 14.🔍 Which is the odd one out? (a) a ceiling fan (b) a table fan (c) an electric kettle (d) a mixer grinder
15. 15.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they explode (c) they all go out (d) they keep glowing
16. 16.True or false: a school bell mainly gives out heat. (a) False (b) True
17. 17.True or false: a long and a short line is the symbol for a battery. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) open a phone charger (b) use a cable with cuts (c) touch a switch when wet (d) stay away from pylons
19. 19.True or false: “a single current path” is true of a series circuit. (a) True (b) False
20. 20.Which of these is safe? (a) use a cable with cuts (b) use mains for a project (c) keep drinks far away (d) climb an electric pole
21. 21.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a ceramic cup across the gap. Does the bulb glow? (a) No (b) Yes
22. 22.True or false: to use mains for a project is not safe. (a) True (b) False
23. 23.True or false: if the switch is OFF, the circuit is closed and current flows. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) take cells out after use (b) open a phone charger (c) poke things in a socket (d) touch a switch when wet
25. 25.🔌 Is a glass marble a conductor or an insulator? (a) a conductor (b) an insulator
26. 26.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
27. 27.💡 2 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?
28. 28.Which drawing is the symbol for an LED? (a) a line lifted at a gap (b) a circle with M inside (c) triangle, bar and arrows (d) two or more cell symbols
29. 29.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a graphite rod across the gap. Does the bulb glow? (a) No (b) Yes
30. 30.🔋 7 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
31. 31.Which of these mainly gives out light? (a) a buzzer (b) a room heater (c) a torch (d) a loudspeaker
32. 32.💡 3 identical bulbs are joined in series with a 12 V battery (ideal wires). How many volts does each bulb get? =
33. 33.What does a toggle switch do? (a) springs back when let go (b) stays where you flip it (c) closes when tipped over (d) works only while pressed
34. 34.🔋 2 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
35. 35.💡 4 identical bulbs are joined in series with a 12 V battery (ideal wires). How many volts does each bulb get? =
36. 36.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a single current path (c) a break stops every bulb (d) own switch for each bulb
37. 37.True or false: to build with an adult near is safe. (a) True (b) False
38. 38.🔋 2 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)? =
39. 39.🔍 Which is the odd one out? (a) a ceramic cup (b) a steel spoon (c) a glass marble (d) a plastic straw
40. 40.🔌 Which part of a screwdriver should an electrician hold? (a) the plastic handle (b) the bare end (c) the steel shaft (d) the metal tip

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