Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 233 · 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 3 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
2. 2.⏱️ repeat 3 times { buzzer ON; wait 300 ms; buzzer OFF; wait 200 ms }
   How many milliseconds does this take in all?
3. 3.🔍 Which is the odd one out? (a) ignore update messages (b) post your live location (c) set a strong password (d) tap unknown app links
4. 4.What does the sensor do? (a) carries the data (b) acts on a command (c) stores data online (d) measures the real world
5. 5.📏 How many kilo-ohms (kΩ) is 3100 Ω? =
6. 6.💡 2 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
7. 7.🔁 What does a variable do in a program? (a) stores a value (b) measures light (c) blinks an LED (d) joins two wires
8. 8.🔁 count = 7
   repeat 6 times { count = count + 5 }
   What is count at the end?
9. 9.True or false: an LED is a resistance knob. (a) False (b) True
10. 10.🧮 Five equal 25 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
11. 11.🔘 When a switch is ON, the circuit is … (a) open (b) closed (c) broken (d) cut
12. 12.🔋 How many 1.5 V cells must be joined in series to give 10.5 V?
13. 13.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
14. 14.🔺 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
15. 15.True or false: to fly a kite near wires is safe. (a) True (b) False
16. 16.🌐 Is a paper calendar an IoT device? (a) not an IoT device (b) an IoT device
17. 17.Which of these means the circuit is open? (a) the loop is complete (b) a wire is cut (c) the switch is ON (d) all wires are joined
18. 18.Which of these is the input? (a) the pump turns on (b) compare with a limit (c) decide if soil is dry (d) a temperature reading
19. 19.🔁 repeat 2 times { repeat 2 times { beep } }
    How many beeps are there?
20. 20.🌈 A resistor has the colour bands orange, white, brown. What is its value (in ohms)?
21. 21.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 1000 (c) 10 (d) 100
22. 22.🤖 Microcontroller or laptop: which one needs much more power? (a) microcontroller (b) laptop
23. 23.🔌 Which part of a screwdriver should an electrician hold? (a) the bare end (b) the steel shaft (c) the plastic handle (d) the metal tip
24. 24.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) False (b) True
25. 25.True or false: a plain rectangle is the symbol for a diode. (a) True (b) False
26. 26.True or false: to share camera links is a risky habit. (a) True (b) False
27. 27.Which job needs a gas sensor? (a) make a parking alarm (b) keep an incubator warm (c) warn of a gas leak (d) close a window in rain
28. 28.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
29. 29.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
30. 30.🔦 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 cotton thread. Does the bulb glow? (a) No (b) Yes
31. 31.True or false: a safety pin is a conductor. (a) True (b) False
32. 32.Which of these is a good habit? (a) accept every permission (b) share camera links (c) read app permissions (d) share the Wi-Fi key
33. 33.🔍 Which is the odd one out? (a) a table fan (b) a ceiling fan (c) an electric iron (d) a mixer grinder
34. 34.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 10 (b) 1000 (c) 1024 (d) 100
35. 35.True or false: a laptop uses very little power. (a) True (b) False
36. 36.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
37. 37.🔺 A current of 0.2 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
38. 38.🌈 A resistor has the colour bands red, orange, yellow. What is its value in kilo-ohms (kΩ)? =
39. 39.📏 How many milliamperes (mA) make 1 ampere? (a) 1000 (b) 10 (c) 60 (d) 100
40. 40.⏱️ How many milliseconds is a wait of 1.1 seconds?

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