Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 620 · 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.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a buzzer (c) a capacitor (d) a diode
2. 2.🔍 Which is the odd one out? (a) a temperature reading (b) a light level reading (c) a soil moisture reading (d) the pump turns on
3. 3.🔍 Which is the odd one out? (a) a graphite rod (b) a copper wire (c) aluminium foil (d) a ceramic cup
4. 4.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in series (c) not joined (d) in parallel
5. 5.🗺️ Before building a project, what should you write down first? (a) nothing at all (b) inputs and outputs (c) the final price (d) the box colour
6. 6.Which of these means the circuit is open? (a) the loop is complete (b) all wires are joined (c) the switch is OFF (d) the switch is ON
7. 7.🧮 Two resistors in parallel give a total that is … (a) their sum (b) always zero (c) less than either one (d) more than either one
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
9. 9.Which of these means the circuit is closed? (a) a wire is cut (b) all wires are joined (c) a wire has come loose (d) a cell is taken out
10. 10.True or false: to stop if a part gets hot is not safe. (a) False (b) True
11. 11.What does a slide switch do? (a) stays where you flip it (b) works only while pressed (c) slides side to side (d) closes when tipped over
12. 12.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
13. 13.⚠️ Is it safe to open a phone charger? (a) not safe (b) safe
14. 14.Which of these is measured in ohms (Ω)? (a) the flow of charge (b) energy used each second (c) the push of a cell (d) how much a part resists
15. 15.True or false: if the bulb is unscrewed, the circuit is open and no current flows. (a) True (b) False
16. 16.True or false: to fly a kite near wires is safe. (a) True (b) False
17. 17.🔺 A current of 25 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
18. 18.True or false: to use small battery cells is not safe. (a) True (b) False
19. 19.Which job is done by the voltage regulator? (a) runs the program (b) restarts the program (c) keeps the voltage steady (d) brings power and code
20. 20.🔁 count = 2
    repeat 6 times { count = count + 3 }
    What is count at the end?
21. 21.What does a potentiometer do? (a) is a resistance knob (b) senses how hot it is (c) makes a beeping sound (d) lets current go one way
22. 22.Which of these gives us electricity? (a) a water pump (b) a battery (c) an air conditioner (d) a mobile phone
23. 23.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
24. 24.🔍 Which is the odd one out? (a) fly a kite near wires (b) dry your hands first (c) fly kites in open fields (d) use small battery cells
25. 25.⏱️ repeat 5 times { buzzer ON; wait 800 ms; buzzer OFF; wait 700 ms }
    How many milliseconds does this take in all?
26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) unplug idle chargers (d) use LED lamps
27. 27.🔁 count = 2
    repeat 10 times { count = count + 10 }
    What is count at the end?
28. 28.🔋 4 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
29. 29.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
30. 30.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) one (c) none (d) two
31. 31.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = R ÷ I (c) V = I ÷ R (d) V = I × R
32. 32.⚠️ Is it safe to stop if a part gets hot? (a) safe (b) not safe
33. 33.Which of these is an insulator? (a) a steel spoon (b) a metal paper clip (c) an iron nail (d) a wooden stick
34. 34.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) bulb (b) resistor (c) battery (d) ammeter
35. 35.🧩 Which part changes electrical energy into movement? (a) a motor (b) a resistor (c) a fuse (d) an LED
36. 36.🔍 Which is the odd one out? (a) an exhaust fan (b) an electric drill (c) an electric iron (d) a table fan
37. 37.Which of these is true of a series circuit? (a) used in house wiring (b) many paths for current (c) bulbs share the voltage (d) each gets the full volts
38. 38.🔺 A current of 0.2 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
39. 39.🧩 Which component has coloured bands? (a) transistor (b) resistor (c) thermistor (d) motor
40. 40.🔌 A gap of dry air between two wires acts as … (a) a cell (b) a switch that is ON (c) a conductor (d) an insulator

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