Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 136 · 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 sensor helps a robot spot a red ball? (a) a camera (b) a temperature sensor (c) a distance sensor (d) a sound sensor
2. 2.🛞 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)?
3. 3.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) turn by exact angles (d) see colours
4. 4.⚙️ A motor makes 360 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
6. 6.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
7. 7.True or false: “a field of tall boulders” suits propellers. (a) False (b) True
8. 8.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
9. 9.Which job needs a gyro sensor? (a) feel a bump into a wall (b) stop before a wall (c) measure a turn angle (d) spot a red ball
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 18 seconds (in cm)?
12. 12.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the wheel size (d) the top speed
14. 14.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 45° (d) 90°
15. 15.True or false: “a smooth classroom floor” suits legs. (a) False (b) True
16. 16.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) pins (d) spokes
17. 17.🧭 A robot faces north. It does: turn right, turn left, turn right. Which way does it face now? (a) east (b) south (c) north (d) west
18. 18.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 45 times. How many times does the driven gear turn?
19. 19.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
20. 20.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.🧭 A robot should turn right 180°, but its gyro shows it turned 192°. How many degrees must it turn back to the left?
22. 22.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
23. 23.Which job needs a distance sensor? (a) measure how far a box is (b) find the brightest spot (c) follow a black line (d) spot a red ball
24. 24.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
25. 25.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) an input (d) a wheel
26. 26.Which job needs a camera? (a) spot a red ball (b) stay balanced upright (c) know a button is pressed (d) hear a whistle
27. 27.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
28. 28.True or false: “a muddy building site” suits legs. (a) True (b) False
29. 29.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
30. 30.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) wheels (d) tracks
31. 31.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
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 left 120°, then right 135°. What does the gyro read now (0° to 359°)?
33. 33.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
34. 34.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
35. 35.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
36. 36.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 60. What is under the sensor? (a) the white floor (b) the black line
39. 39.📡 A robot is 160 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
40. 40.Which of these suits tracks? (a) moving under water (b) flying over a field (c) crossing stepping-stones (d) loose sand dunes

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