Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 834 · 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.🔁 x = 5
   repeat 4 times { x = x × 2 }
   What is x at the end?
2. 2.🔋 Identical cells side by side (in parallel) give … (a) no voltage (b) half the voltage (c) double the voltage (d) the same voltage
3. 3.🧮 A 20 Ω resistor is joined in series with two equal 220 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
4. 4.💡 2 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?
5. 5.True or false: triangle against a bar is the symbol for a cell. (a) True (b) False
6. 6.What does a toggle switch do? (a) closes near a magnet (b) works only while pressed (c) flips up or down (d) springs back when let go
7. 7.🔍 Which is the odd one out? (a) open a phone charger (b) keep drinks far away (c) fly kites in open fields (d) build with an adult near
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
10. 10.🔌 A gap of dry air between two wires acts as … (a) an insulator (b) a conductor (c) a cell (d) a switch that is ON
11. 11.True or false: the voltmeter measures voltage. (a) True (b) False
12. 12.Which of these is a risky habit? (a) ignore update messages (b) log out of shared phones (c) cover unused cameras (d) install software updates
13. 13.🔺 A current of 10 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
14. 14.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 33 °C. What happens? (a) fan OFF (b) fan ON
15. 15.🌈 A resistor has the colour bands brown, orange, black. What is its value (in ohms)?
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.True or false: if the switch is OFF, the circuit is closed and current flows. (a) False (b) True
18. 18.Which of these is the process? (a) a buzzer beeps (b) a button press (c) a temperature reading (d) decide if soil is dry
19. 19.💡 A red LED (it uses 2 V) is joined with a 100 Ω resistor to a 2.5 V supply. What current flows (in mA)?
20. 20.🔌 Which part of a screwdriver should an electrician hold? (a) the steel shaft (b) the plastic handle (c) the bare end (d) the metal tip
21. 21.True or false: to share the Wi-Fi key is a risky habit. (a) False (b) True
22. 22.Which of these is true of a series circuit? (a) a single current path (b) many paths for current (c) one out, the rest glow (d) own switch for each bulb
23. 23.Which of these is the process? (a) a button press (b) a buzzer beeps (c) check if temp > 30 (d) an LED lights up
24. 24.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 130 Ω resistor? (a) brown-orange-red (b) brown-orange-brown (c) brown-orange-black (d) orange-brown-brown
25. 25.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they explode (c) they all go out (d) they get dimmer
26. 26.🧮 A 22 Ω resistor is joined in series with two equal 1000 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
27. 27.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
28. 28.Which of these uses electricity? (a) a bicycle dynamo (b) a solar panel (c) a battery (d) a water pump
29. 29.True or false: to share only needed data is a risky habit. (a) True (b) False
30. 30.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) light energy (b) chemical energy (c) movement energy (d) sound energy
31. 31.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
32. 32.🤖 Does a wind-up toy usually have a microcontroller inside? (a) Yes (b) No
33. 33.🔦 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 graphite rod. Does the bulb glow? (a) Yes (b) No
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.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) smaller (c) bigger (d) zero
36. 36.🔐 Is it a good or a risky habit to accept every permission? (a) good habit (b) risky habit
37. 37.🔍 Which is the odd one out? (a) a street light (b) a room heater (c) an LED lamp (d) a torch
38. 38.True or false: a microwave oven has no microcontroller inside. (a) False (b) True
39. 39.⚠️ Which power source should children use for electronics projects? (a) an inverter socket (b) a wall socket (c) a small battery pack (d) a mains extension board
40. 40.True or false: “many paths for current” is true of a parallel circuit. (a) True (b) False

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