Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 604 · 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 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
2. 2.Which job needs a temperature sensor? (a) hear a whistle (b) warn if motors get hot (c) measure how far a box is (d) find the brightest spot
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
4. 4.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) the same direction (d) they do not turn
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
8. 8.🛞 Circumference = π × … (a) weight (b) radius only (c) diameter (d) speed
9. 9.Which of these suits propellers? (a) a hospital corridor (b) crossing stepping-stones (c) hovering over a roof (d) soft snow
10. 10.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) an input (d) a wheel
11. 11.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) tracks (c) propellers (d) legs
12. 12.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
13. 13.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
14. 14.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
15. 15.Which of these suits tracks? (a) crossing stepping-stones (b) deep mud (c) a flat road (d) moving under water
16. 16.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the black/white cut-off (d) the top speed
17. 17.True or false: “soft snow” suits tracks. (a) False (b) True
18. 18.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
19. 19.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
20. 20.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
21. 21.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
22. 22.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
23. 23.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
25. 25.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
26. 26.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) faster (d) slower
27. 27.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
28. 28.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a temperature sensor
29. 29.⚙️ A 75-tooth driver gear turns a 15-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
30. 30.Which of these suits legs? (a) moving under water (b) soft snow (c) a hospital corridor (d) a field of tall boulders
31. 31.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 31. What is under the sensor? (a) the black line (b) the white floor
32. 32.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
33. 33.🛞 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
34. 34.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins right on the spot (b) turns left (c) goes straight back (d) turns right
35. 35.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.🛞 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) spins left on the spot (b) turns right (c) goes straight forward (d) spins right on the spot
37. 37.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
39. 39.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 90° (d) 100°
40. 40.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size

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