Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 535 · 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 of these uses electricity? (a) a solar panel (b) a water pump (c) a bicycle dynamo (d) a generator
2. 2.📏 Voltmeter or ammeter: which one measures current? (a) ammeter (b) voltmeter
3. 3.🔁 count = 0
   repeat 10 times { count = count + 7 }
   What is count at the end?
4. 4.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) an open circuit (c) a series circuit (d) a closed circuit
5. 5.🔗 Series or parallel circuit: “each gets the full volts”? (a) parallel (b) series
6. 6.True or false: a transistor senses how hot it is. (a) True (b) False
7. 7.🔁 count = 8
   repeat 2 times { count = count + 5 }
   What is count at the end?
8. 8.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 25 % (c) 5 % (d) 0 %
9. 9.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) capacitor (b) voltmeter (c) battery (d) switch
10. 10.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = V + I (c) R = I ÷ V (d) R = V × I
11. 11.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
12. 12.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 0.5 V (c) 15 V (d) 1.5 V
13. 13.🧩 Which component makes a beeping sound? (a) resistor (b) transistor (c) buzzer (d) LDR
14. 14.🔁 total = 0
    for i = 1 to 3 { total = total + i }
    What is total at the end?
15. 15.🔁 What does “count = count + 1” do? (a) takes 1 away (b) sets count to 1 (c) adds 1 to count (d) prints 1
16. 16.True or false: if the loop is complete, the circuit is open and no current flows. (a) False (b) True
17. 17.True or false: “many paths for current” is true of a parallel circuit. (a) True (b) False
18. 18.True or false: on an LED, the leg by the flat edge is the cathode (−). (a) False (b) True
19. 19.🔘 Which kind of switch closes when tipped over? (a) a push button (b) a tilt switch (c) a toggle switch (d) a slide switch
20. 20.True or false: a cotton thread is a conductor. (a) True (b) False
21. 21.🔋 What should you do with used-up cells? (a) cut them open (b) give them for recycling (c) throw them in a fire (d) bury them in soil
22. 22.📏 How many amperes (A) is 90 mA? =
23. 23.🔺 A 0.4 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
24. 24.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) Yes (b) No
25. 25.📏 How many watts (W) is 3.9 kW?
26. 26.Which drawing is the symbol for a capacitor? (a) two equal parallel lines (b) a long and a short line (c) a circle with an X in it (d) many long-short pairs
27. 27.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is OFF. Does the bulb glow? (a) No (b) Yes
28. 28.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
29. 29.Which job needs a rain sensor? (a) spot someone walking in (b) open blinds at sunrise (c) measure classroom noise (d) close a window in rain
30. 30.🔘 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 ON and C is OFF. Does the bulb glow? (a) No (b) Yes
31. 31.🧭 Which part of a microcontroller board brings power and code? (a) the pins (b) the power LED (c) the main chip (d) the USB port
32. 32.⏱️ How many milliseconds is a wait of 1.3 seconds?
33. 33.Which of these means the circuit is closed? (a) the switch is OFF (b) a cell is taken out (c) all wires are joined (d) a wire has come loose
34. 34.🧭 Which part of a microcontroller board shows the board is on? (a) the main chip (b) the power LED (c) the voltage regulator (d) the USB port
35. 35.💡 3 identical bulbs are joined in series with a 12 V battery (ideal wires). How many volts does each bulb get? =
36. 36.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
37. 37.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
38. 38.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
39. 39.⚠️ Who should be with you when you build a circuit? (a) a trusted adult (b) nobody (c) a younger child (d) a stranger online
40. 40.Which of these means the circuit is open? (a) all wires are joined (b) the switch is ON (c) a wire has come loose (d) the loop is complete

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