Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 508 · 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.🧭 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 0°. It turns right 60°, then left 60°. What does the gyro read now (0° to 359°)?
2. 2.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they are too cheap (c) too fast on floors (d) they never tire
3. 3.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
4. 4.Which of these suits legs? (a) crossing stepping-stones (b) a hospital corridor (c) deep mud (d) loose sand dunes
5. 5.⚙️ A motor makes 180 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
6. 6.🛞 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 12 times. How far does the robot roll (in cm)?
7. 7.Which of these suits propellers? (a) flying over a field (b) deep mud (c) a smooth classroom floor (d) a field of tall boulders
8. 8.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 28. What is under the sensor? (a) the white floor (b) the black line
10. 10.⚙️ A motor makes 240 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
11. 11.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
12. 12.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
13. 13.True or false: “soft snow” suits propellers. (a) False (b) True
14. 14.🔍 Which sensor helps a robot hear a whistle? (a) a gyro sensor (b) a light sensor (c) a sound sensor (d) a touch sensor
15. 15.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 67. What is under the sensor? (a) the white floor (b) the black line
16. 16.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
19. 19.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) one wheel runs faster (d) it uses a sail
20. 20.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
21. 21.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 23. What is under the sensor? (a) the black line (b) the white floor
22. 22.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
25. 25.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) turn by exact angles (d) hear claps
26. 26.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 45° (d) 360°
27. 27.🧭 A robot should turn right 180°, but its gyro shows it turned 191°. How many degrees must it turn back to the left?
28. 28.🔍 Why do robots need sensors? (a) to look colourful (b) to know their world (c) to use more power (d) to be heavier
29. 29.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times slower (d) 3 times louder
30. 30.⚙️ An 8-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
34. 34.🦾 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
35. 35.🧭 A robot faces west. It does: turn around, turn around, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
36. 36.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 1 km (d) 34 cm
37. 37.True or false: “a long factory floor” suits propellers. (a) True (b) False
38. 38.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
39. 39.Which job needs a touch sensor? (a) stop before a wall (b) start on a hand clap (c) read a QR code (d) feel a bump into a wall
40. 40.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a touch sensor (c) a gyro sensor (d) a camera

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