Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 292 · 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 family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.🔍 Which is the odd one out? (a) a copper wire (b) a graphite rod (c) a metal paper clip (d) a rubber eraser
3. 3.📏 How many ohms (Ω) is 1.9 kΩ?
4. 4.📏 Which unit measures voltage? (a) ampere (A) (b) volt (V) (c) ohm (Ω) (d) watt (W)
5. 5.Which of these is an input? (a) a buzzer (b) a temperature sensor (c) a motor (d) a servo motor
6. 6.🔋 How many 1.5 V cells must be joined in series to give 3 V?
7. 7.🔐 Is it a good or a risky habit to ignore update messages? (a) good habit (b) risky habit
8. 8.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I ÷ R (c) V = I × R (d) V = I + R
9. 9.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) post it online (b) share it with friends (c) type it all in (d) ask a parent first
10. 10.🔘 Which kind of switch closes when tipped over? (a) a reed switch (b) a push button (c) a tilt switch (d) a toggle switch
11. 11.True or false: to cover unused cameras is a risky habit. (a) True (b) False
12. 12.🔋 3 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
13. 13.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
14. 14.🌈 Which band is read first on a resistor? (a) the widest gap (b) any band (c) the gold band (d) the one nearest an end
15. 15.True or false: to touch a fallen wire is not safe. (a) True (b) False
16. 16.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
17. 17.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 67. What happens? (a) lamp OFF (b) lamp ON
18. 18.🔺 A current of 50 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
19. 19.🔺 A 7.5 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
20. 20.True or false: on an LED, the longer leg is the cathode (−). (a) True (b) False
21. 21.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
22. 22.Which of these mainly gives out light? (a) a siren (b) a tube light (c) a doorbell (d) an electric kettle
23. 23.True or false: a laptop runs one small program. (a) True (b) False
24. 24.Which of these is measured in watts (W)? (a) voltage (b) energy used each second (c) how much a part resists (d) the push of a cell
25. 25.🔁 count = 9
    repeat 5 times { count = count + 5 }
    What is count at the end?
26. 26.🔺 A current of 10 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
27. 27.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a soil moisture sensor (c) a rain sensor (d) a sound sensor
28. 28.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = R ÷ V (c) I = V + R (d) I = V ÷ R
29. 29.True or false: a laptop needs much more power. (a) True (b) False
30. 30.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
31. 31.🔐 Is it a good or a risky habit to accept every permission? (a) good habit (b) risky habit
32. 32.True or false: a plastic ruler is a conductor. (a) True (b) False
33. 33.Which of these gives us electricity? (a) a mobile phone (b) a refrigerator (c) a water pump (d) a wind turbine
34. 34.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) LED (b) ammeter (c) voltmeter (d) junction
35. 35.True or false: a rice cooker mainly gives out light. (a) True (b) False
36. 36.Which of these is an IoT device? (a) a pencil sharpener (b) a smart energy meter (c) a plain table fan (d) a wind-up clock
37. 37.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a safe circuit (b) a parallel circuit (c) a short circuit (d) an open circuit
38. 38.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 21 cm. What happens? (a) buzzer beeps (b) buzzer is silent
39. 39.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
40. 40.🔢 To plan an electronics project, which comes first: “draw the circuit diagram” or “list inputs and outputs”? (a) draw the circuit diagram (b) list inputs and outputs

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