Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 412 · 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.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) wheels (c) propellers (d) legs
2. 2.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) never important (d) small (fast, weak)
3. 3.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
4. 4.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
5. 5.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
6. 6.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a distance sensor (c) a touch sensor (d) a gyro sensor
7. 7.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
8. 8.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
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.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
11. 11.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) too fast on floors (c) harder to balance (d) they are too cheap
12. 12.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
13. 13.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
16. 16.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is loud (d) black is hot
20. 20.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 22 (d) 7/22
24. 24.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
25. 25.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
26. 26.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
27. 27.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times louder (d) 3 times faster
28. 28.True or false: “a flat road” suits propellers. (a) True (b) False
29. 29.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
30. 30.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
31. 31.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
32. 32.🧭 A robot should turn right 45°, but its gyro shows it turned 49°. How many degrees must it turn back to the left?
33. 33.🧭 A robot should turn right 45°, but its gyro shows it turned 59°. How many degrees must it turn back to the left?
34. 34.🛞 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) turns left (b) turns right (c) stays still (d) goes straight forward
35. 35.🛞 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) spins left on the spot (b) goes straight forward (c) spins right on the spot (d) stays still
36. 36.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) teeth (d) tyres
37. 37.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
38. 38.True or false: “a long factory floor” suits wheels. (a) True (b) False
39. 39.🧭 A robot spins 15° every second. How many seconds does it take to turn 105°?
40. 40.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?

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