Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 942 · 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.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 35 times. How many times does the driven gear turn?
2. 2.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a temperature sensor (c) a sound sensor (d) a distance sensor
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 210°?
4. 4.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black soaks up light (d) black is loud
5. 5.Which of these suits tracks? (a) hovering over a roof (b) a smooth classroom floor (c) moving under water (d) deep mud
6. 6.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
7. 7.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
8. 8.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
9. 9.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
10. 10.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are round (c) they are shiny (d) they spread the weight
11. 11.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) an output (d) a wheel
12. 12.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 62. What is under the sensor? (a) the white floor (b) the black line
13. 13.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a white surface (d) a black line
14. 14.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 3 cm (d) 340 cm
15. 15.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
16. 16.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
17. 17.🦾 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 up and left (b) points right (c) points straight up (d) points left
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
19. 19.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they climb stairs (c) they float (d) they look funny
20. 20.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 2/7 (d) 7/22
21. 21.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
23. 23.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 180° (d) 45°
24. 24.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
25. 25.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) sound too high to hear (d) water drops
26. 26.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 45° (d) 90°
27. 27.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a camera
28. 28.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
29. 29.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
30. 30.🧭 A robot should turn right 180°, but its gyro shows it turned 170°. How many degrees must it turn more to the right?
31. 31.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
32. 32.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) tyre (c) idler gear (d) driven gear
33. 33.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
34. 34.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
35. 35.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
37. 37.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
38. 38.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
39. 39.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) one up, one down (d) they do not turn
40. 40.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?

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