Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 74 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.📡 A robot is 300 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?
3. 3.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 90° (d) 360°
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 20. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
5. 5.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a wheel (d) a gear
6. 6.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
7. 7.Which of these suits legs? (a) a flat road (b) crossing stepping-stones (c) deep mud (d) soft snow
8. 8.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) north (b) east (c) west (d) south
9. 9.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they never tire (d) they are too cheap
10. 10.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) white (d) black
11. 11.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
12. 12.True or false: “a field of tall boulders” suits tracks. (a) True (b) False
13. 13.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.Which job needs a touch sensor? (a) stop before a wall (b) hear a whistle (c) measure a turn angle (d) feel a bump into a wall
16. 16.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
18. 18.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
19. 19.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
20. 20.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
21. 21.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a sound sensor (d) a gyro sensor
23. 23.⚙️ A motor makes 40 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
24. 24.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 36. What is under the sensor? (a) the black line (b) the white floor
25. 25.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
27. 27.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 80. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
29. 29.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
30. 30.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 21. What is under the sensor? (a) the black line (b) the white floor
31. 31.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
32. 32.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns right 45°, then left 135°, then right 135°. What does the gyro read now (0° to 359°)?
33. 33.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
34. 34.Which job needs a camera? (a) stay balanced upright (b) read a QR code (c) stop before a wall (d) feel a bump into a wall
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
36. 36.📡 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)?
37. 37.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) spins right on the spot (c) turns left (d) goes straight forward
38. 38.Which of these suits propellers? (a) moving under water (b) a field of tall boulders (c) loose sand dunes (d) soft snow
39. 39.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big

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