Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 226 · 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 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 right (b) points straight up (c) points up and left (d) points right
2. 2.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
3. 3.Which of these suits propellers? (a) a long factory floor (b) a smooth classroom floor (c) deep mud (d) flying over a field
4. 4.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
5. 5.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
7. 7.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
8. 8.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
9. 9.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 2/7 (d) 7/22
10. 10.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
11. 11.🧭 A robot should turn right 90°, but its gyro shows it turned 101°. How many degrees must it turn back to the left?
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
15. 15.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
16. 16.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a gyro sensor (c) a light sensor (d) a touch sensor
18. 18.Which of these suits wheels? (a) hovering over a roof (b) crossing stepping-stones (c) moving under water (d) a long factory floor
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
21. 21.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
22. 22.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) they never tire (c) harder to balance (d) too fast on floors
23. 23.Which job needs a camera? (a) feel a bump into a wall (b) start on a hand clap (c) read a QR code (d) find the brightest spot
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 12. What is under the sensor? (a) the black line (b) the white floor
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
27. 27.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
28. 28.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the white floor (b) the black line
29. 29.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
31. 31.🧭 A robot should turn right 45°, but its gyro shows it turned 49°. How many degrees must it turn back to the left?
32. 32.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
33. 33.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a cow (d) a bat
34. 34.⚙️ A 24-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
35. 35.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 3 (d) 4
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
37. 37.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.📡 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
39. 39.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
40. 40.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?

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