Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 698 · 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 do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
2. 2.🧭 A robot spins 15° every second. How many seconds does it take to turn 360°?
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.🛞 Circumference = π × … (a) diameter (b) weight (c) radius only (d) speed
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 75. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
7. 7.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
8. 8.📡 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?
9. 9.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 90. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
10. 10.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
11. 11.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
12. 12.🧭 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 45°, then left 60°. What does the gyro read now (0° to 359°)?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
14. 14.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
15. 15.📡 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)?
16. 16.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) sound is slow (d) it goes there and back
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) between the two sensors (c) under the left sensor (d) far behind it
19. 19.🛞 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)? =
20. 20.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
21. 21.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) spins left on the spot (c) goes straight forward (d) turns right
22. 22.True or false: to follow a black line, use a distance sensor. (a) True (b) False
23. 23.🧭 A robot faces north. It does: turn left, turn left, turn around, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
24. 24.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times faster (d) 3 times louder
25. 25.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
26. 26.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
27. 27.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
28. 28.True or false: to spot a red ball, use a temperature sensor. (a) True (b) False
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 20. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
30. 30.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
31. 31.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the battery size (d) the black/white cut-off
32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
34. 34.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it uses a sail (d) it stops for ever
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
36. 36.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a gyro sensor (c) a touch sensor (d) a temperature sensor
37. 37.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
38. 38.🔍 Which sensor helps a robot feel a bump into a wall? (a) a gyro sensor (b) a sound sensor (c) a touch sensor (d) a light sensor
39. 39.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
40. 40.📡 A robot is 200 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?

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