Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 6 · 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’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns left 60°, then right 180°. What does the gyro read now (0° to 359°)?
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
3. 3.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
4. 4.📡 A robot is 110 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
6. 6.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) see colours (d) turn by exact angles
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
8. 8.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
9. 9.⚙️ 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 small driver gear (b) a big driver gear
10. 10.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times slower (d) 3 times louder
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a flat wall (c) a wooden box (d) a soft foam cushion
14. 14.🛞 Circumference = π × … (a) speed (b) diameter (c) weight (d) radius only
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
16. 16.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) sound too high to hear (d) radio music
17. 17.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster and weaker
18. 18.📡 A robot is 180 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 7 seconds (in cm)?
19. 19.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
20. 20.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) tyre (c) driven gear (d) idler gear
21. 21.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
22. 22.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
23. 23.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
24. 24.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
25. 25.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black is hot (d) black soaks up light
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
27. 27.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) wheels (c) propellers (d) legs
28. 28.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
29. 29.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 10 seconds (in cm)?
30. 30.🧭 A robot should turn right 180°, but its gyro shows it turned 178°. How many degrees must it turn more to the right?
31. 31.🔍 Which sensor helps a robot start on a hand clap? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a touch sensor
32. 32.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a distance sensor (c) a touch sensor (d) a light sensor
33. 33.Which of these suits wheels? (a) loose sand dunes (b) soft snow (c) a hospital corridor (d) moving under water
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 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 right (c) curves to the left
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
36. 36.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
37. 37.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
38. 38.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
39. 39.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
40. 40.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?

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