Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 25 · 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 24-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
2. 2.🧭 A robot should turn right 180°, but its gyro shows it turned 184°. How many degrees must it turn back to the left?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
4. 4.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) stays still (c) spins left on the spot (d) turns left
5. 5.Which job needs a light sensor? (a) stop before a wall (b) hear a whistle (c) measure a turn angle (d) follow a black line
6. 6.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) an output (d) a gear
7. 7.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
8. 8.⚙️ A motor makes 240 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
9. 9.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
10. 10.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) propellers (c) legs (d) tracks
11. 11.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) small (fast, weak) (c) never important (d) zero
12. 12.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) bright light (c) radio music (d) water drops
13. 13.⚙️ A motor makes 100 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
14. 14.🛞 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 backward. What does the robot do? (a) goes straight forward (b) stays still (c) turns right (d) spins right on the spot
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
17. 17.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a light sensor (c) a sound sensor (d) a touch sensor
18. 18.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
19. 19.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) wheels (c) tracks (d) legs
20. 20.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
21. 21.Which job needs a gyro sensor? (a) measure a turn angle (b) feel a bump into a wall (c) know a button is pressed (d) stop before a wall
22. 22.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
23. 23.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a touch sensor (c) a camera (d) a light sensor
24. 24.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
25. 25.🧭 A robot should turn right 90°, but its gyro shows it turned 98°. How many degrees must it turn back to the left?
26. 26.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
27. 27.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 83. What is under the sensor? (a) the black line (b) the white floor
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 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
29. 29.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
30. 30.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) turning (rotation) (d) sound
31. 31.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
32. 32.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a touch sensor (c) a sound sensor (d) a gyro sensor
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
34. 34.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
35. 35.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle + 40
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.📡 A robot is 160 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 18 seconds (in cm)?
37. 37.🧭 A robot faces north. It does: turn around, turn right, turn around, turn around. Which way does it face now? (a) south (b) east (c) west (d) north
38. 38.🧭 A robot faces south. It does: turn left, turn around. Which way does it face now? (a) west (b) south (c) north (d) east
39. 39.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 360° (d) 90°
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor

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