Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 844 · 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 kind of switch springs back when let go? (a) a slide switch (b) a toggle switch (c) a push button (d) a reed switch
2. 2.🧮 Two equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
3. 3.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) output (b) input (c) process
4. 4.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
   The temperature is 45 °C. What is shown? (a) Hot (b) Warm (c) Cool
5. 5.🔢 To plan an electronics project, which is the LAST step? (a) list inputs and outputs (b) test it and fix it (c) draw the circuit diagram (d) build it with an adult
6. 6.💡 An LED is joined to a 5 V battery with no resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) lights up (b) does not light (c) may burn out
7. 7.🔺 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
8. 8.🧮 Two resistors in parallel give a total that is … (a) always zero (b) their sum (c) less than either one (d) more than either one
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
10. 10.Which of these is a conductor? (a) a wooden stick (b) a plastic ruler (c) a cotton thread (d) aluminium foil
11. 11.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
13. 13.🧭 Which part of a microcontroller board shows the board is on? (a) the pins (b) the main chip (c) the power LED (d) the USB port
14. 14.Which of these mainly gives out heat? (a) a rice cooker (b) a school bell (c) a siren (d) a buzzer
15. 15.🔁 repeat 2 times { repeat 3 times { beep } }
    How many beeps are there?
16. 16.📏 How many milliamperes (mA) make 1 ampere? (a) 60 (b) 10 (c) 1000 (d) 100
17. 17.True or false: triangle, bar and arrows is the symbol for a resistor. (a) False (b) True
18. 18.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
19. 19.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
21. 21.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
22. 22.🔁 total = 0
    for i = 1 to 8 { total = total + i }
    What is total at the end?
23. 23.🔘 Which kind of switch works only while pressed? (a) a tilt switch (b) a slide switch (c) a reed switch (d) a push button
24. 24.🔺 A current of 1.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
25. 25.What does a toggle switch do? (a) works only while pressed (b) closes when tipped over (c) flips up or down (d) closes near a magnet
26. 26.💡 An LED is joined to a 6 V battery through a 1000 Ω resistor; its long leg goes to the − side and its short leg to the + side. What happens? (a) may burn out (b) lights up (c) does not light
27. 27.Which of these is not safe? (a) build with an adult near (b) use small battery cells (c) poke things in a socket (d) keep drinks far away
28. 28.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the input (b) the process (c) the output (d) the battery
29. 29.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) an LED (d) a display
30. 30.Which of these is measured in watts (W)? (a) power (b) resistance (c) the push of a cell (d) current
31. 31.🔍 Which is the odd one out? (a) an electric drill (b) a mixer grinder (c) a night lamp (d) a ceiling fan
32. 32.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) bulb (b) battery (c) capacitor (d) ammeter
33. 33.True or false: to post your live location is a risky habit. (a) True (b) False
34. 34.🔘 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 ON, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
35. 35.⏱️ What does “wait 500 ms” do? (a) blinks 500 times (b) waits 500 seconds (c) turns the LED off (d) pauses for half a second
36. 36.🔘 A bulb and a cell are joined through 2 switches on 2 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
37. 37.True or false: a microwave oven has no microcontroller inside. (a) False (b) True
38. 38.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) neither line (c) the shorter line (d) the longer line
39. 39.🔺 A current of 2.5 A flows when 12.5 V is joined across a resistor. What is its resistance (in ohms)?
40. 40.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) a motor (d) an LED

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