Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 68 · 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.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put an iron nail across the gap. Does the bulb glow? (a) Yes (b) No
2. 2.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
5. 5.🔁 count = 0
   repeat 8 times { count = count + 3 }
   What is count at the end?
6. 6.🔁 x = 2
   repeat 4 times { x = x × 2 }
   What is x at the end?
7. 7.🔺 A current of 2.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
8. 8.🔁 What does “count = count + 1” do? (a) prints 1 (b) takes 1 away (c) adds 1 to count (d) sets count to 1
9. 9.🔍 Which is the odd one out? (a) compare with a limit (b) decide if soil is dry (c) a light level reading (d) count button presses
10. 10.🌈 In the resistor colour code, which number does orange stand for?
11. 11.Which of these is an IoT device? (a) a battery torch (b) a wind-up clock (c) a plain wall switch (d) an app-controlled bulb
12. 12.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.Which of these gives us electricity? (a) a water pump (b) a washing machine (c) a battery (d) a television
15. 15.🌐 What does IoT stand for? (a) Inside of Toys (b) Internet of Things (c) Internet of Talk (d) Input of Tools
16. 16.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = I ÷ V (d) P = V ÷ I
17. 17.🔁 x = 4
    repeat 3 times { x = x × 2 }
    What is x at the end?
18. 18.🔺 A current of 3 A flows when 24 V is joined across a resistor. What is its resistance (in ohms)?
19. 19.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 9 V (c) 230 V (d) 1.5 V
20. 20.💡 An LED is joined to a 6 V battery through a 330 Ω resistor; its long leg goes to the − side and its short leg to the + side. What happens? (a) lights up (b) may burn out (c) does not light
21. 21.🔢 To plan an electronics project, which is the FIRST step? (a) build it with an adult (b) test it and fix it (c) pick a problem to solve (d) draw the circuit diagram
22. 22.🔁 count = 0
    repeat 3 times { count = count + 7 }
    What is count at the end?
23. 23.True or false: to keep drinks far away is not safe. (a) True (b) False
24. 24.🔁 count = 8
    repeat 4 times { count = count + 2 }
    What is count at the end?
25. 25.🔋 4 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
26. 26.🗺️ Before building a project, what should you write down first? (a) inputs and outputs (b) nothing at all (c) the final price (d) the box colour
27. 27.Which of these is the output? (a) decide if soil is dry (b) a buzzer beeps (c) a soil moisture reading (d) count button presses
28. 28.🔍 Which is the odd one out? (a) install software updates (b) log out of shared phones (c) ignore update messages (d) read app permissions
29. 29.🔘 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
30. 30.🔺 An 8 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
31. 31.Which of these is the process? (a) the pump turns on (b) a buzzer beeps (c) decide if soil is dry (d) a temperature reading
32. 32.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) both of them (c) it does not matter (d) none
33. 33.True or false: to reuse one password is a risky habit. (a) True (b) False
34. 34.⏱️ A program says “wait 3000 ms”. How many seconds is that? =
35. 35.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
36. 36.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
37. 37.💡 4 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
38. 38.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) to hide the circuit (c) quick and clear for all (d) symbols are heavier
39. 39.Which of these is a risky habit? (a) set up with a parent (b) log out of shared phones (c) set a strong password (d) ignore update messages
40. 40.🔁 total = 0
    for i = 1 to 11 { total = total + i }
    What is total at the end?

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