Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 328 · 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.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
2. 2.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a dark tunnel (d) a white surface
3. 3.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) goes straight back (c) stays still (d) turns left
4. 4.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
5. 5.True or false: “flying over a field” suits propellers. (a) True (b) False
6. 6.Which job needs a gyro sensor? (a) stop before a wall (b) stay balanced upright (c) warn if motors get hot (d) feel a bump into a wall
7. 7.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a touch sensor (c) a temperature sensor (d) a light sensor
8. 8.🦾 A servo program runs:
   angle = 20
   angle = angle + 50
   angle = angle − 20
   angle = angle + 50
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
10. 10.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
11. 11.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) tracks (c) legs (d) wheels
12. 12.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a touch sensor (c) a light sensor (d) a sound sensor
13. 13.Which job needs a touch sensor? (a) stay balanced upright (b) feel a bump into a wall (c) follow a black line (d) spot a red ball
14. 14.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
15. 15.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) an output (d) a gear
16. 16.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
17. 17.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
18. 18.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) too fast on floors (d) harder to balance
19. 19.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) small (fast, weak) (c) zero (d) never important
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
21. 21.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
23. 23.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
24. 24.🧭 A robot faces west. It does: turn left, turn around. Which way does it face now? (a) west (b) east (c) south (d) north
25. 25.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
26. 26.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
29. 29.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
32. 32.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
33. 33.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
34. 34.True or false: “loose sand dunes” suits propellers. (a) False (b) True
35. 35.True or false: to read a QR code, use a gyro sensor. (a) False (b) True
36. 36.🔦 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 white floor (b) the black line
37. 37.True or false: to read a QR code, use a sound sensor. (a) True (b) False
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
39. 39.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big

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