Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 46 · 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.🔢 To plan an electronics project, what comes right after “pick a problem to solve”? (a) list inputs and outputs (b) build it with an adult (c) draw the circuit diagram (d) test it and fix it
2. 2.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put aluminium foil across the gap. Does the bulb glow? (a) Yes (b) No
3. 3.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
4. 4.Which of these is a risky habit? (a) set up with a parent (b) set a strong password (c) keep factory passwords (d) turn off unused gadgets
5. 5.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.🔋 8 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)? =
7. 7.🔋 6 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
8. 8.True or false: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
9. 9.🔘 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 OFF, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
10. 10.🔁 What does a variable do in a program? (a) blinks an LED (b) stores a value (c) measures light (d) joins two wires
11. 11.🔁 count = 1
    while (count < 16) { count = count + 3 }
    How many times does the loop run?
12. 12.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a sound sensor (d) a speaker
13. 13.What does the phone app do? (a) reads values, decides (b) shows data to you (c) stores data online (d) carries the data
14. 14.What does a toggle switch do? (a) slides side to side (b) closes near a magnet (c) flips up or down (d) works only while pressed
15. 15.True or false: an LED lamp mainly makes movement. (a) True (b) False
16. 16.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a rubber band. Does the bulb glow? (a) Yes (b) No
17. 17.What does a tilt switch do? (a) works only while pressed (b) flips up or down (c) closes near a magnet (d) closes when tipped over
18. 18.True or false: a steel spoon is a conductor. (a) True (b) False
19. 19.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 22 cm. What happens? (a) buzzer beeps (b) buzzer is silent
20. 20.True or false: two equal parallel lines is the symbol for a switch. (a) True (b) False
21. 21.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) wire (b) motor (c) LED (d) switch
22. 22.🔗 Series or parallel circuit: “each gets the full volts”? (a) parallel (b) series
23. 23.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) switch (b) wire (c) cell (d) bulb
24. 24.🔁 count = 6
    repeat 9 times { count = count + 9 }
    What is count at the end?
25. 25.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a resistor (c) a diode (d) a buzzer
26. 26.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) only one (c) none (d) it does not matter
27. 27.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 350 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
28. 28.🌈 Which band is read first on a resistor? (a) the gold band (b) the one nearest an end (c) any band (d) the widest gap
29. 29.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 38 °C. What is shown? (a) Cool (b) Hot (c) Warm
30. 30.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) the if part (c) the else part (d) both parts
31. 31.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) prints 1 (c) takes 1 away (d) sets count to 1
32. 32.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) touch a fallen wire (b) use small battery cells (c) use a cable with cuts (d) poke things in a socket
35. 35.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) straight lines (c) dotted circles (d) little stars
36. 36.🔺 A current of 20 mA flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
37. 37.Which of these is a risky habit? (a) read app permissions (b) ignore update messages (c) set up with a parent (d) log out of shared phones
38. 38.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) turn to an exact angle
39. 39.🔌 Is an iron nail a conductor or an insulator? (a) a conductor (b) an insulator
40. 40.🔍 Which is the odd one out? (a) use mains for a project (b) touch a switch when wet (c) poke things in a socket (d) build with an adult near

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