Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 580 · 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.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black soaks up light (d) black is wet
2. 2.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
3. 3.True or false: “a flat road” suits tracks. (a) False (b) True
4. 4.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a camera (c) a distance sensor (d) a temperature sensor
5. 5.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
6. 6.True or false: “crossing stepping-stones” suits wheels. (a) False (b) True
7. 7.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
8. 8.🔍 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
9. 9.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
10. 10.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
11. 11.True or false: “moving under water” suits tracks. (a) False (b) True
12. 12.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
13. 13.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points right (c) points up and right (d) points left
14. 14.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a touch sensor (c) a distance sensor (d) a sound sensor
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
19. 19.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a bat (d) a goldfish
21. 21.🧭 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 90°. It turns left 45°, then left 30°. What does the gyro read now (0° to 359°)?
22. 22.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
23. 23.⚙️ A 36-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
24. 24.Which of these suits wheels? (a) soft snow (b) a smooth classroom floor (c) moving under water (d) flying over a field
25. 25.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
26. 26.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) propellers (d) legs
28. 28.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
29. 29.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 62. What is under the sensor? (a) the black line (b) the white floor
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
31. 31.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
32. 32.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
33. 33.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
34. 34.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) north (b) east (c) south (d) west
35. 35.📡 A robot is 190 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 3 seconds (in cm)?
36. 36.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
37. 37.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a light sensor (c) a temperature sensor (d) a gyro sensor
38. 38.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
39. 39.⚙️ A 12-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
40. 40.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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