Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 247 · 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.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 45° (d) 360°
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.Which of these suits tracks? (a) soft snow (b) crossing stepping-stones (c) moving under water (d) a smooth classroom floor
5. 5.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
6. 6.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
7. 7.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
8. 8.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black line (d) a black surface
9. 9.🔍 Which sensor helps a robot stay balanced upright? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a gyro sensor
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it jumps (c) it stops for ever (d) one wheel runs faster
12. 12.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
13. 13.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
14. 14.🧭 A robot faces north. It does: turn left, turn left, turn left, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
16. 16.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
17. 17.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
20. 20.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) tracks (c) propellers (d) wheels
21. 21.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
23. 23.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
24. 24.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
25. 25.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) pins (d) teeth
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.Which of these suits tracks? (a) moving under water (b) flying over a field (c) a long factory floor (d) a muddy building site
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 10
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 31 seconds (in cm)?
31. 31.True or false: “a muddy building site” suits tracks. (a) True (b) False
32. 32.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
33. 33.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
34. 34.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 36. What is under the sensor? (a) the black line (b) the white floor
35. 35.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
36. 36.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
38. 38.⚙️ A motor makes 200 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor

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