Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 750 · 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.🛞 Circumference = π × … (a) weight (b) diameter (c) radius only (d) speed
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) turns right (c) spins left on the spot (d) turns left
3. 3.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) east (b) south (c) north (d) west
4. 4.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 41. What is under the sensor? (a) the white floor (b) the black line
5. 5.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
6. 6.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🦾 A servo program runs:
   angle = 60
   angle = angle + 20
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 90° (d) 180°
9. 9.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
10. 10.📡 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
11. 11.Which of these suits propellers? (a) a field of tall boulders (b) deep mud (c) loose sand dunes (d) moving under water
12. 12.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) propellers (c) legs (d) wheels
13. 13.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
15. 15.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
16. 16.🧭 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 135°, then left 120°, then right 60°. What does the gyro read now (0° to 359°)?
17. 17.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.Which of these suits legs? (a) loose sand dunes (b) a smooth classroom floor (c) a flat road (d) stepping over wide gaps
19. 19.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its weight (d) its circumference
20. 20.📡 A robot is 120 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
21. 21.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
22. 22.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a light sensor (c) a touch sensor (d) a gyro sensor
23. 23.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
25. 25.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) hear claps (c) see colours (d) smell smoke
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
27. 27.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
28. 28.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 60
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.📡 A robot is 130 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 4 seconds (in cm)?
30. 30.True or false: to read a QR code, use a gyro sensor. (a) False (b) True
31. 31.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) wheels (c) propellers (d) tracks
32. 32.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a black surface (d) a white surface
33. 33.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
34. 34.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
35. 35.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
36. 36.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.True or false: to hear a whistle, use a distance sensor. (a) False (b) True
38. 38.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
39. 39.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
40. 40.True or false: to stop before a wall, use a gyro sensor. (a) True (b) False

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