Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 843 · 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.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
2. 2.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) tracks (c) legs (d) wheels
3. 3.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a light sensor (c) a temperature sensor (d) a touch sensor
4. 4.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) one up, one down (d) the same direction
5. 5.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
6. 6.⚙️ 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
7. 7.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) tracks (d) propellers
8. 8.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times bigger (d) 3 times louder
9. 9.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 16. What is under the sensor? (a) the white floor (b) the black line
10. 10.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
11. 11.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
13. 13.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
14. 14.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns left (b) stays still (c) goes straight back (d) goes straight forward
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
17. 17.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to look colourful (d) to be heavier
18. 18.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
19. 19.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the black line (b) the white floor
20. 20.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
22. 22.Which job needs a touch sensor? (a) find the brightest spot (b) know a button is pressed (c) read a QR code (d) follow a black line
23. 23.🧭 A robot faces north. It does: turn right, turn right, turn right, turn around. Which way does it face now? (a) south (b) north (c) east (d) west
24. 24.Which of these suits tracks? (a) a smooth classroom floor (b) loose sand dunes (c) stepping over wide gaps (d) a long factory floor
25. 25.⚙️ A motor makes 220 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
26. 26.🧭 A robot should turn right 45°, but its gyro shows it turned 58°. How many degrees must it turn back to the left?
27. 27.⚙️ A motor makes 360 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
28. 28.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
29. 29.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
30. 30.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
31. 31.Which of these suits wheels? (a) deep mud (b) a hospital corridor (c) a muddy building site (d) stepping over wide gaps
32. 32.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
33. 33.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) the sky (d) water
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
35. 35.Which of these suits propellers? (a) loose sand dunes (b) a field of tall boulders (c) moving under water (d) a long factory floor
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 52. What is under the sensor? (a) the white floor (b) the black line
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
39. 39.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
40. 40.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?

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