Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 466 · 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 wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) harder to balance (d) too fast on floors
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
4. 4.Which job needs a light sensor? (a) spot a red ball (b) feel a bump into a wall (c) know a button is pressed (d) find the brightest spot
5. 5.True or false: “a hospital corridor” suits wheels. (a) True (b) False
6. 6.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
9. 9.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
10. 10.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?
11. 11.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) faster but weaker (c) at the same speed (d) slower but stronger
12. 12.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
13. 13.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a gyro sensor (c) a sound sensor (d) a light sensor
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
16. 16.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
17. 17.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
18. 18.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
19. 19.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
20. 20.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
21. 21.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
22. 22.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) the sky (d) water
24. 24.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
25. 25.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) turn by exact angles (d) smell smoke
26. 26.🛞 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 backward. What does the robot do? (a) turns right (b) spins left on the spot (c) goes straight back (d) goes straight forward
27. 27.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) slower (d) faster
28. 28.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
29. 29.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
30. 30.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
31. 31.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
32. 32.🛞 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) spins right on the spot (c) turns right (d) goes straight forward
33. 33.📡 A robot is 160 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
36. 36.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
37. 37.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
38. 38.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
39. 39.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
40. 40.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?

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