Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 589 · 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.True or false: to warn if motors get hot, use a distance sensor. (a) False (b) True
2. 2.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
3. 3.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
4. 4.Which job needs a camera? (a) feel a bump into a wall (b) measure a turn angle (c) start on a hand clap (d) read a QR code
5. 5.Which job needs a gyro sensor? (a) hear a whistle (b) stay balanced upright (c) feel a bump into a wall (d) read a QR code
6. 6.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 53. What is under the sensor? (a) the black line (b) the white floor
7. 7.🔍 Which sensor helps a robot measure a turn angle? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a distance sensor
8. 8.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
9. 9.📡 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)?
10. 10.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
11. 11.⚙️ A motor makes 120 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
12. 12.Which of these suits tracks? (a) deep mud (b) a hospital corridor (c) a flat road (d) stepping over wide gaps
13. 13.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) backwards (d) nowhere
14. 14.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 57. What is under the sensor? (a) the black line (b) the white floor
15. 15.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
16. 16.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
17. 17.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a flat wall (c) a soft foam cushion (d) a wooden box
18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 30
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
20. 20.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
21. 21.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
23. 23.⚙️ 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 big driver gear (b) a small driver gear
24. 24.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) slower but stronger (d) at the same speed
28. 28.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
29. 29.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) hear claps (c) smell smoke (d) see colours
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
31. 31.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
32. 32.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
33. 33.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
34. 34.⚙️ A 10-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
35. 35.Which job needs a touch sensor? (a) hear a whistle (b) spot a red ball (c) feel a bump into a wall (d) read a QR code
36. 36.🧭 A robot should turn right 90°, but its gyro shows it turned 101°. How many degrees must it turn back to the left?
37. 37.🧭 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 45°, then left 30°. What does the gyro read now (0° to 359°)?
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
40. 40.Which of these suits legs? (a) a flat road (b) a hospital corridor (c) crossing stepping-stones (d) a muddy building site

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