Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 746 · 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 keeps turning right by 90° at a time. How many turns make one full circle?
2. 2.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
4. 4.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
5. 5.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) small (fast, weak) (d) never important
6. 6.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 4 (d) 3
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
8. 8.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
9. 9.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
11. 11.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
13. 13.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
14. 14.True or false: to follow a black line, use a light sensor. (a) True (b) False
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
16. 16.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
17. 17.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) tracks (c) propellers (d) wheels
18. 18.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
19. 19.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
20. 20.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
21. 21.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
22. 22.Which of these suits legs? (a) loose sand dunes (b) flying over a field (c) moving under water (d) stepping over wide gaps
23. 23.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster and weaker
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🦾 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 right (b) points straight up (c) points left (d) points right
26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
27. 27.⚙️ A motor makes 210 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
28. 28.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
29. 29.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
30. 30.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a touch sensor
31. 31.⚙️ A motor makes 180 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
32. 32.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) stays still (b) spins left on the spot (c) turns right (d) spins right on the spot
33. 33.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
34. 34.True or false: “a long factory floor” suits wheels. (a) False (b) True
35. 35.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
37. 37.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
38. 38.🧭 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 90°. It turns left 60°, then right 45°, then left 135°. What does the gyro read now (0° to 359°)?
39. 39.Which job needs a distance sensor? (a) feel a bump into a wall (b) stay balanced upright (c) stop before a wall (d) find the brightest spot
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left

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