Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 114 · 40 questions

Remember (Find the topic, use the idea): Find the topic: circuit, safety, formula, component, program, sensor or IoT. Use that lesson’s rule — complete loop, V = I × R, P = V × I, last command wins, true → if part. Safety answers are always: low voltage, dry hands, an adult, never the mains.

1. 1.True or false: a plain rectangle is the symbol for a wire. (a) False (b) True
2. 2.🔋 How many 3 V cells must be joined in series to give 9 V?
3. 3.🔁 repeat 2 times { repeat 2 times { beep } }
   How many beeps are there?
4. 4.Which of these is true of a series circuit? (a) each gets the full volts (b) one out, the rest glow (c) a single current path (d) used in house wiring
5. 5.True or false: a diode lets current go one way. (a) False (b) True
6. 6.🔺 A current of 1 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
7. 7.⚠️ Which power source should children use for electronics projects? (a) a mains extension board (b) a wall socket (c) a small battery pack (d) an inverter socket
8. 8.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True
9. 9.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) both lines (d) the longer line
10. 10.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 0 V (d) 9 V
11. 11.Which drawing is the symbol for a cell? (a) a circle with V inside (b) a plain rectangle (c) a long and a short line (d) a circle with a cross
12. 12.Which of these is measured in amperes (A)? (a) the push of a cell (b) the flow of charge (c) energy used each second (d) resistance
13. 13.🔋 Does a generator give electricity or use electricity? (a) uses electricity (b) gives electricity
14. 14.⚠️ Is it safe to fly kites in open fields? (a) safe (b) not safe
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
16. 16.Which job is done by the voltage regulator? (a) brings power and code (b) keeps the voltage steady (c) runs the program (d) shows the board is on
17. 17.🧮 Resistors of 33 Ω, 47 Ω, 10 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
18. 18.🔍 Which is the odd one out? (a) climb an electric pole (b) poke things in a socket (c) stay away from pylons (d) touch a fallen wire
19. 19.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
20. 20.Which job needs a distance sensor? (a) warn of a gas leak (b) stop a robot near walls (c) start a fan when hot (d) switch on lamps at dusk
21. 21.🌈 Which band is read first on a resistor? (a) the gold band (b) the widest gap (c) any band (d) the one nearest an end
22. 22.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 33000 Ω resistor? (a) orange-orange-orange (b) orange-orange-yellow (c) orange-yellow-orange (d) orange-orange-red
23. 23.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = I ÷ V (c) R = V + I (d) R = V × I
24. 24.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 400 ms }
    How many milliseconds does one blink (ON + OFF) take?
25. 25.💡 2 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
26. 26.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 0 % (c) 50 % (d) 5 %
27. 27.What does a push button do? (a) works only while pressed (b) stays where you flip it (c) closes when tipped over (d) closes near a magnet
28. 28.Which of these is an input? (a) a small display (b) an LED (c) a water pump (d) a motion sensor
29. 29.Which of these gives us electricity? (a) a television (b) a refrigerator (c) a computer (d) a bicycle dynamo
30. 30.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 6 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
31. 31.True or false: the voltmeter measures voltage. (a) False (b) True
32. 32.🔋 A 9 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
33. 33.🔺 A 10 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
34. 34.🔘 When a switch is ON, the circuit is … (a) open (b) broken (c) cut (d) closed
35. 35.True or false: a tilt switch closes near a magnet. (a) False (b) True
36. 36.🔐 Is it a good or a risky habit to keep factory passwords? (a) risky habit (b) good habit
37. 37.What does a tilt switch do? (a) closes when tipped over (b) slides side to side (c) works only while pressed (d) stays where you flip it
38. 38.Which of these is measured in watts (W)? (a) energy used each second (b) the push of a cell (c) the flow of charge (d) current
39. 39.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) a water pump
40. 40.🤖 Does a bicycle bell usually have a microcontroller inside? (a) No (b) Yes

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