Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 667 · 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.Which job needs a touch sensor? (a) follow a black line (b) stop before a wall (c) stay balanced upright (d) feel a bump into a wall
2. 2.🧭 A robot should turn right 45°, but its gyro shows it turned 56°. How many degrees must it turn back to the left?
3. 3.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
5. 5.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
6. 6.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
7. 7.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) backwards (d) slower
8. 8.True or false: to follow a black line, use a temperature sensor. (a) False (b) True
9. 9.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a sound sensor (c) a gyro sensor (d) a temperature sensor
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
11. 11.⚙️ A motor makes 360 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?
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
13. 13.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
14. 14.🧭 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 270°. It turns left 120°, then right 90°, then left 135°. What does the gyro read now (0° to 359°)?
15. 15.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
16. 16.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
18. 18.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
19. 19.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) an output (d) a gear
20. 20.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
21. 21.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker
22. 22.True or false: to follow a black line, use a sound sensor. (a) False (b) True
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
24. 24.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 45 times. How many times does the driven gear turn?
25. 25.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
26. 26.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
27. 27.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) propellers (c) legs (d) tracks
28. 28.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is loud (d) black is wet
29. 29.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
30. 30.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
32. 32.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 47. What is under the sensor? (a) the black line (b) the white floor
33. 33.🧭 A robot faces east. It does: turn right, turn around. Which way does it face now? (a) west (b) north (c) east (d) south
34. 34.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
35. 35.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 45° (d) 180°
36. 36.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
37. 37.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
39. 39.📡 A robot is 210 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 8 seconds (in cm)?
40. 40.⚙️ A motor makes 90 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?

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