Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 614 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) an input (d) a wheel
2. 2.Which job needs a temperature sensor? (a) start on a hand clap (b) know a button is pressed (c) warn if motors get hot (d) follow a black line
3. 3.Which job needs a distance sensor? (a) find the brightest spot (b) stop before a wall (c) stay balanced upright (d) warn if motors get hot
4. 4.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) wheels (c) propellers (d) legs
5. 5.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
6. 6.🧭 A robot should turn right 90°, but its gyro shows it turned 82°. How many degrees must it turn more to the right?
7. 7.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
8. 8.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points left
9. 9.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
10. 10.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) tyres (d) teeth
11. 11.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 90°. It turns left 180°, then left 120°, then left 45°. What does the gyro read now (0° to 359°)?
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
13. 13.True or false: to feel a bump into a wall, use a camera. (a) False (b) True
14. 14.Which of these suits tracks? (a) soft snow (b) a long factory floor (c) moving under water (d) hovering over a roof
15. 15.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
16. 16.🧭 A robot faces north. It does: turn left, turn left, turn around. Which way does it face now? (a) east (b) south (c) west (d) north
17. 17.Which job needs a touch sensor? (a) stop before a wall (b) follow a black line (c) start on a hand clap (d) feel a bump into a wall
18. 18.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
19. 19.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
21. 21.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
22. 22.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
23. 23.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
24. 24.🧭 A robot should turn right 180°, but its gyro shows it turned 178°. How many degrees must it turn more to the right?
25. 25.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
26. 26.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
28. 28.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
29. 29.📡 A robot is 230 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
30. 30.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 72. What is under the sensor? (a) the black line (b) the white floor
31. 31.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
32. 32.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
33. 33.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
34. 34.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
35. 35.True or false: “a field of tall boulders” suits wheels. (a) True (b) False
36. 36.Which job needs a gyro sensor? (a) measure a turn angle (b) spot a red ball (c) hear a whistle (d) read a QR code
37. 37.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
38. 38.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) slower (d) nowhere
39. 39.⚙️ A motor makes 210 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
40. 40.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) wheels (c) tracks (d) propellers

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