Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 7 · 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.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
5. 5.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) under the right sensor (c) far behind it (d) between the two sensors
6. 6.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
7. 7.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
8. 8.⚙️ A 30-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
9. 9.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a snail (d) a goldfish
10. 10.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) wheels (c) propellers (d) tracks
11. 11.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points right (c) points left (d) points straight up
12. 12.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 35 times. How many times does the driven gear turn?
13. 13.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🧭 A robot faces west. It does: turn right, turn around, turn around. Which way does it face now? (a) west (b) south (c) north (d) east
15. 15.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
16. 16.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) tracks (c) wheels (d) propellers
17. 17.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
19. 19.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
20. 20.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
21. 21.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 54. What is under the sensor? (a) the black line (b) the white floor
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
28. 28.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) wheels (c) legs (d) propellers
29. 29.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
30. 30.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) sound too high to hear (d) radio music
31. 31.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
32. 32.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
33. 33.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22 (d) 22/7
34. 34.Which of these suits wheels? (a) a smooth classroom floor (b) crossing stepping-stones (c) a muddy building site (d) deep mud
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 10
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 39. What is under the sensor? (a) the black line (b) the white floor
38. 38.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
39. 39.Which job needs a sound sensor? (a) follow a black line (b) stay balanced upright (c) hear a whistle (d) measure how far a box is
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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