Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 542 · 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 of these suits tracks? (a) crossing stepping-stones (b) soft snow (c) stepping over wide gaps (d) a smooth classroom floor
2. 2.🛞 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?
3. 3.📡 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?
4. 4.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
5. 5.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
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 270°. It turns left 30°, then left 180°. What does the gyro read now (0° to 359°)?
9. 9.🧭 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 0°. It turns left 90°, then left 135°. What does the gyro read now (0° to 359°)?
10. 10.🦾 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 straight up (b) points left (c) points up and left (d) points right
11. 11.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
12. 12.🧭 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 45°, then left 120°. What does the gyro read now (0° to 359°)?
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
14. 14.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
15. 15.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
16. 16.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
18. 18.📡 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
19. 19.🧭 How many degrees is a right-angle turn? (a) 90° (b) 180° (c) 360° (d) 45°
20. 20.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
21. 21.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
22. 22.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a touch sensor
24. 24.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
25. 25.📡 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?
26. 26.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) wheels (c) propellers (d) legs
27. 27.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
28. 28.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
29. 29.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) harder to balance (d) too fast on floors
30. 30.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
31. 31.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) spokes (d) teeth
32. 32.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
36. 36.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to use more power (d) to know their world
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
38. 38.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) the sensor is half (d) it goes there and back
39. 39.Which job needs a gyro sensor? (a) spot a red ball (b) hear a whistle (c) measure a turn angle (d) read a QR code
40. 40.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No

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