Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 125 · 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.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the wheel size (d) the battery size
4. 4.🔍 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
5. 5.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) an input (d) a gear
6. 6.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) they float (d) fast and easy on floors
7. 7.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 180° (d) 45°
8. 8.🛞 Circumference = π × … (a) diameter (b) speed (c) radius only (d) weight
9. 9.True or false: to stay balanced upright, use a temperature sensor. (a) False (b) True
10. 10.🧭 A robot faces north. It does: turn left, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
11. 11.Which of these suits wheels? (a) flying over a field (b) a flat road (c) loose sand dunes (d) hovering over a roof
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points left (c) points right (d) points up and left
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points left (c) points up and right (d) points up and left
15. 15.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
16. 16.⚙️ A motor makes 150 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
19. 19.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times louder (d) 3 times faster
20. 20.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
21. 21.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) smell smoke (d) turn by exact angles
22. 22.🧭 A robot faces east. It does: turn right, turn around, turn around. Which way does it face now? (a) east (b) south (c) north (d) west
23. 23.🔍 Why do robots need sensors? (a) to look colourful (b) to use more power (c) to know their world (d) to be heavier
24. 24.True or false: “flying over a field” suits tracks. (a) True (b) False
25. 25.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the black line (b) the white floor
27. 27.🛞 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
28. 28.True or false: “hovering over a roof” suits propellers. (a) False (b) True
29. 29.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a gyro sensor (c) a light sensor (d) a touch sensor
30. 30.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
31. 31.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
34. 34.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
37. 37.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
38. 38.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
39. 39.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
40. 40.Which of these suits propellers? (a) a muddy building site (b) hovering over a roof (c) a long factory floor (d) soft snow

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