Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 431 · 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 45°, then right 60°. What does the gyro read now (0° to 359°)?
2. 2.Which of these suits legs? (a) crossing stepping-stones (b) flying over a field (c) a flat road (d) a smooth classroom floor
3. 3.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a gyro sensor
4. 4.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 22/7 (d) 7/22
6. 6.🧭 A robot faces west. It does: turn left, turn right, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
8. 8.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
10. 10.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
11. 11.🦾 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 right (d) points up and left
12. 12.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) propellers (d) tracks
13. 13.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) propellers (c) wheels (d) tracks
14. 14.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
15. 15.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
16. 16.⚙️ A motor makes 120 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
17. 17.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) legs (c) wheels (d) tracks
18. 18.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
20. 20.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
21. 21.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.Which job needs a touch sensor? (a) stay balanced upright (b) hear a whistle (c) know a button is pressed (d) measure a turn angle
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
24. 24.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
25. 25.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) small (fast, weak) (c) zero (d) never important
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a sound sensor (c) a gyro sensor (d) a touch sensor
28. 28.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) wheels (c) propellers (d) tracks
29. 29.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
30. 30.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
31. 31.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
32. 32.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
33. 33.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
34. 34.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
35. 35.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
37. 37.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
38. 38.🛞 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) goes straight back (b) turns right (c) stays still (d) goes straight forward
39. 39.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?

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