Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 684 · 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.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) so all go off together (d) each gets full voltage
2. 2.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) battery (b) resistor (c) LED (d) wire
3. 3.🔌 Is an iron nail a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.True or false: a small empty box is the symbol for a resistor. (a) False (b) True
5. 5.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
6. 6.Which of these is safe? (a) throw cells in a fire (b) use a cable with cuts (c) use small battery cells (d) touch a switch when wet
7. 7.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
8. 8.⚡ What does a torch mainly change electricity into? (a) sound (b) light (c) movement (d) heat
9. 9.🔘 Which kind of switch works only while pressed? (a) a tilt switch (b) a toggle switch (c) a reed switch (d) a push button
10. 10.Which drawing is the symbol for a battery? (a) a circle with A inside (b) a long and a short line (c) two or more cell symbols (d) a circle with an X in it
11. 11.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is OFF, B is ON, C is OFF and D is ON. Does the bulb glow? (a) No (b) Yes
12. 12.True or false: a dot where wires meet is the symbol for a voltmeter. (a) True (b) False
13. 13.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they keep glowing (c) they get dimmer (d) they all go out
14. 14.True or false: if the switch is ON, the circuit is closed and current flows. (a) False (b) True
15. 15.True or false: a tube light mainly gives out light. (a) False (b) True
16. 16.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True
17. 17.🔘 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) never (d) only when both are OFF
18. 18.💡 2 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 1 is taken out of its holder. How many bulbs glow?
19. 19.⚡ Which tiny particles drift along a metal wire to carry the current? (a) water drops (b) dust particles (c) photons (d) electrons
20. 20.🔋 A 3 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
21. 21.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
22. 22.True or false: if all wires are joined, the circuit is open and no current flows. (a) True (b) False
23. 23.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the base (b) the switch (c) the filament (d) the glass
24. 24.What does a push button do? (a) closes when tipped over (b) closes near a magnet (c) stays where you flip it (d) works only while pressed
25. 25.🔍 Which is the odd one out? (a) throw cells in a fire (b) fly kites in open fields (c) use mains for a project (d) poke things in a socket
26. 26.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
27. 27.Which drawing is the symbol for a switch? (a) a long and a short line (b) a circle with M inside (c) two or more cell symbols (d) a line lifted at a gap
28. 28.Which of these is an insulator? (a) a graphite rod (b) a copper wire (c) an iron nail (d) a glass marble
29. 29.Which of these means the circuit is closed? (a) a cell is taken out (b) the loop is complete (c) a wire has come loose (d) the bulb is unscrewed
30. 30.⚠️ Is it safe to use mains for a project? (a) safe (b) not safe
31. 31.🔌 A gap of dry air between two wires acts as … (a) a conductor (b) an insulator (c) a cell (d) a switch that is ON
32. 32.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) battery (b) switch (c) voltmeter (d) capacitor
33. 33.🔍 Which is the odd one out? (a) a torch (b) a traffic signal (c) a street light (d) a toaster
34. 34.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
35. 35.🔋 What should you do with used-up cells? (a) bury them in soil (b) throw them in a fire (c) cut them open (d) give them for recycling
36. 36.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a plug top (b) a long wire (c) a bulb (d) a fuse or MCB
37. 37.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 5 of the switches are OFF and the rest are ON. How many bulbs glow?
38. 38.🔋 How many 1.5 V cells must be joined in series to give 10.5 V?
39. 39.Which drawing is the symbol for a bulb? (a) a circle with an X in it (b) one tall, one short bar (c) a circle with A inside (d) a long and a short line
40. 40.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) in series (c) not joined (d) by Wi-Fi

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