Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 800 · 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 has a left and a right light sensor. Below 50 means black. The left sensor reads 30 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
2. 2.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.Which of these suits propellers? (a) a long factory floor (b) flying over a field (c) a flat road (d) a field of tall boulders
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
5. 5.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) tracks (c) propellers (d) legs
6. 6.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the wheel size (d) the battery size
7. 7.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
9. 9.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) faster and weaker (d) at the same speed
10. 10.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it stops for ever (d) it uses a sail
11. 11.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) stays still (b) goes straight back (c) turns left (d) goes straight forward
14. 14.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a dark tunnel (c) a black surface (d) a black line
15. 15.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) white (d) water
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
19. 19.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
21. 21.True or false: to start on a hand clap, use a light sensor. (a) True (b) False
22. 22.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
23. 23.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
24. 24.🔍 Which sensor helps a robot stay balanced upright? (a) a sound sensor (b) a temperature sensor (c) a gyro sensor (d) a camera
25. 25.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
26. 26.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 27. What is under the sensor? (a) the white floor (b) the black line
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
28. 28.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) goes straight forward (c) goes straight back (d) turns left
30. 30.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
31. 31.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
33. 33.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
35. 35.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
36. 36.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a camera (c) a temperature sensor (d) a distance sensor
37. 37.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
39. 39.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.🛞 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 back (b) spins right on the spot (c) turns right (d) goes straight forward

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