Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 848 · 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 keeps turning right by 30° at a time. How many turns make one full circle?
2. 2.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
3. 3.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.True or false: to read a QR code, use a touch sensor. (a) True (b) False
5. 5.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 36. What is under the sensor? (a) the black line (b) the white floor
6. 6.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
7. 7.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
8. 8.🧭 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 30°, then right 180°, then left 30°. What does the gyro read now (0° to 359°)?
9. 9.Which of these suits legs? (a) a long factory floor (b) a hospital corridor (c) a flat road (d) a field of tall boulders
10. 10.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is hot (d) black is wet
11. 11.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
13. 13.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
14. 14.🛞 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)?
15. 15.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) tracks (c) wheels (d) propellers
16. 16.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
17. 17.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
18. 18.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
19. 19.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
22. 22.True or false: to measure a turn angle, use a sound sensor. (a) False (b) True
23. 23.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 54. What is under the sensor? (a) the black line (b) the white floor
24. 24.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) tracks (c) propellers (d) wheels
26. 26.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
27. 27.Which job needs a light sensor? (a) measure how far a box is (b) follow a black line (c) feel a bump into a wall (d) start on a hand clap
28. 28.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
29. 29.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
30. 30.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
31. 31.🦾 A servo moves from 70° to 0°. How many degrees does it turn?
32. 32.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
34. 34.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times slower (d) 3 times bigger
36. 36.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
37. 37.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
38. 38.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a light sensor (c) a gyro sensor (d) a distance sensor
39. 39.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
40. 40.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =

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