Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 944 · 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.🌈 In the resistor colour code, which number does violet stand for?
2. 2.🔌 Is a steel coin a conductor or an insulator? (a) a conductor (b) an insulator
3. 3.🧩 Which component blows if current is high? (a) potentiometer (b) LDR (c) fuse (d) diode
4. 4.True or false: power is measured in watts (W). (a) False (b) True
5. 5.Which of these is measured in ohms (Ω)? (a) the push of a cell (b) the flow of charge (c) voltage (d) how much a part resists
6. 6.🔁 count = 6
   repeat 8 times { count = count + 4 }
   What is count at the end?
7. 7.🔁 repeat 6 times { repeat 2 times { beep } }
   How many beeps are there?
8. 8.Which of these gives us electricity? (a) a cell (b) a refrigerator (c) a television (d) a water pump
9. 9.🤖 if (sound > 70) { red LED ON } else { green LED ON }
   The sound sensor reads 79. What happens? (a) green LED ON (b) red LED ON
10. 10.🔘 When a switch is ON, the circuit is … (a) cut (b) broken (c) closed (d) open
11. 11.True or false: to log out of shared phones is a risky habit. (a) False (b) True
12. 12.Which job needs a motion sensor? (a) spot someone walking in (b) switch on with a clap (c) measure classroom noise (d) stop a robot near walls
13. 13.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 4 of the switches are OFF and the rest are ON. How many bulbs glow?
14. 14.Which drawing is the symbol for a junction? (a) a long and a short line (b) a circle with V inside (c) a circle with A inside (d) a dot where wires meet
15. 15.🔍 Which is the odd one out? (a) stop if a part gets hot (b) take cells out after use (c) use mains for a project (d) dry your hands first
16. 16.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
17. 17.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) True (b) False
18. 18.Which of these is a good habit? (a) keep factory passwords (b) accept every permission (c) read app permissions (d) post your live location
19. 19.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
20. 20.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
21. 21.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
22. 22.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
23. 23.📏 Which unit measures voltage? (a) ohm (Ω) (b) ampere (A) (c) watt (W) (d) volt (V)
24. 24.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe
25. 25.True or false: the push of a cell is measured in ohms (Ω). (a) False (b) True
26. 26.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
27. 27.💡 3 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
28. 28.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) all wires are joined (d) the switch is OFF
29. 29.🔋 6 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
30. 30.🌈 Which band is read first on a resistor? (a) the gold band (b) any band (c) the one nearest an end (d) the widest gap
31. 31.⏱️ How many milliseconds is a wait of 1.9 seconds?
32. 32.Which drawing is the symbol for a bulb? (a) a circle with M inside (b) many long-short pairs (c) a circle with a cross (d) triangle against a bar
33. 33.⚡ A cell changes stored chemical energy into which kind of energy? (a) electrical energy (b) wind energy (c) sound energy (d) nuclear energy
34. 34.🗺️ In an input → process → output plan, is “a light level reading” the input, the process or the output? (a) input (b) output (c) process
35. 35.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
36. 36.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
37. 37.🌐 A weather station sends one reading every 30 seconds. How many readings does it send in 5 minutes?
38. 38.🔺 A current of 10 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
39. 39.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
40. 40.Which drawing is the symbol for a diode? (a) a long and a short line (b) triangle against a bar (c) a circle with a cross (d) a straight line

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids