Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 970 · 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 has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns left (b) goes straight back (c) spins right on the spot (d) stays still
2. 2.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 69. What is under the sensor? (a) the black line (b) the white floor
3. 3.🛞 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) turns left (b) goes straight forward (c) spins left on the spot (d) goes straight back
4. 4.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 360° (c) 180° (d) 90°
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
7. 7.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
9. 9.🧭 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 90°, then right 120°, then left 90°. What does the gyro read now (0° to 359°)?
10. 10.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to know their world (d) to use more power
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
14. 14.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.📡 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)?
16. 16.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.🧭 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 right 45°, then left 120°. What does the gyro read now (0° to 359°)?
18. 18.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
19. 19.🛞 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) goes straight back (b) spins right on the spot (c) goes straight forward (d) spins left on the spot
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
21. 21.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
22. 22.⚙️ A motor makes 240 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.🧭 A robot faces east. It does: turn right, turn left, turn around. Which way does it face now? (a) south (b) north (c) east (d) west
25. 25.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
26. 26.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 63. What is under the sensor? (a) the black line (b) the white floor
27. 27.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
28. 28.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) propellers (c) tracks (d) legs
29. 29.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
30. 30.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 46. What is under the sensor? (a) the white floor (b) the black line
31. 31.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
34. 34.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
36. 36.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
37. 37.Which job needs a distance sensor? (a) measure how far a box is (b) feel a bump into a wall (c) follow a black line (d) read a QR code
38. 38.🛞 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)? =
39. 39.True or false: “a smooth classroom floor” suits wheels. (a) True (b) False
40. 40.True or false: “stepping over wide gaps” suits legs. (a) False (b) True

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