Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 617 · 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 wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 594 cm?
2. 2.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a camera
3. 3.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) radio music (d) sound too high to hear
4. 4.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 43. What is under the sensor? (a) the black line (b) the white floor
5. 5.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 90° (d) 100°
6. 6.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
7. 7.Which job needs a camera? (a) measure a turn angle (b) warn if motors get hot (c) spot a red ball (d) measure how far a box is
8. 8.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) propellers (c) wheels (d) legs
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
10. 10.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times louder (d) 3 times bigger
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.Which job needs a camera? (a) start on a hand clap (b) warn if motors get hot (c) measure a turn angle (d) read a QR code
13. 13.True or false: to warn if motors get hot, use a light sensor. (a) True (b) False
14. 14.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7
15. 15.🧭 A robot faces west. It does: turn left, turn around, turn around. Which way does it face now? (a) south (b) north (c) east (d) west
16. 16.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
17. 17.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
18. 18.Which job needs a gyro sensor? (a) measure a turn angle (b) stop before a wall (c) know a button is pressed (d) spot a red ball
19. 19.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
21. 21.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a sound sensor (c) a gyro sensor (d) a camera
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
25. 25.True or false: to stay balanced upright, use a temperature sensor. (a) True (b) False
26. 26.🛞 Circumference = π × … (a) radius only (b) speed (c) diameter (d) weight
27. 27.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) propellers (c) legs (d) wheels
28. 28.🧭 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 180°. It turns right 180°, then left 30°, then left 30°. What does the gyro read now (0° to 359°)?
29. 29.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the wheel size (d) the top speed
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 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
31. 31.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
32. 32.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
34. 34.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
35. 35.True or false: “hovering over a roof” suits propellers. (a) False (b) True
36. 36.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
37. 37.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 12 seconds (in cm)?
38. 38.⚙️ 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
39. 39.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
40. 40.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) tracks (c) legs (d) wheels

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