Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 637 · 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 robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) not at all (d) slower but stronger
3. 3.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
4. 4.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
5. 5.📡 A robot is 240 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
6. 6.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
7. 7.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
8. 8.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
9. 9.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
10. 10.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
11. 11.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) wheels (c) propellers (d) tracks
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
13. 13.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 19. What is under the sensor? (a) the white floor (b) the black line
14. 14.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
15. 15.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
16. 16.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
17. 17.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
18. 18.Which job needs a camera? (a) hear a whistle (b) follow a black line (c) read a QR code (d) start on a hand clap
19. 19.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
20. 20.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 45° (d) 180°
21. 21.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
22. 22.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
24. 24.⚙️ A 20-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
25. 25.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a touch sensor (c) a temperature sensor (d) a camera
26. 26.True or false: “deep mud” suits tracks. (a) False (b) True
27. 27.🦾 A servo moves from 20° to 160°. How many degrees does it turn?
28. 28.🦾 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 up and right (b) points up and left (c) points right (d) points straight up
29. 29.🦾 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 left (c) points right (d) points up and right
30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
31. 31.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
32. 32.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
33. 33.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
34. 34.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a gyro sensor (c) a distance sensor (d) a camera
35. 35.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
36. 36.🛞 Circumference = π × … (a) diameter (b) speed (c) weight (d) radius only
37. 37.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) harder to balance (d) they never tire
38. 38.Which of these suits propellers? (a) a flat road (b) flying over a field (c) a long factory floor (d) crossing stepping-stones
39. 39.Which of these suits legs? (a) hovering over a roof (b) a muddy building site (c) a flat road (d) a field of tall boulders
40. 40.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor

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