Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 866 · 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’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns right 60°, then right 30°. What does the gyro read now (0° to 359°)?
2. 2.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
3. 3.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
4. 4.Which job needs a camera? (a) measure how far a box is (b) feel a bump into a wall (c) read a QR code (d) know a button is pressed
5. 5.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) too fast on floors (d) they are too cheap
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
7. 7.True or false: to measure a turn angle, use a gyro sensor. (a) True (b) False
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
9. 9.📡 A robot is 190 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 6 seconds (in cm)?
10. 10.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
11. 11.⚙️ A motor makes 200 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
12. 12.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
13. 13.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a distance sensor (c) a camera (d) a sound sensor
14. 14.True or false: “a field of tall boulders” suits legs. (a) True (b) False
15. 15.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
17. 17.True or false: “a field of tall boulders” suits tracks. (a) False (b) True
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
19. 19.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
20. 20.🧭 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 180°. It turns right 30°, then left 180°, then left 180°. What does the gyro read now (0° to 359°)?
21. 21.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
22. 22.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) number of gears (d) wheel size
24. 24.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
25. 25.🔍 What does a gyro sensor measure? (a) sound (b) colour (c) temperature (d) turning (rotation)
26. 26.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
29. 29.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) the same direction (d) they do not turn
31. 31.True or false: to find the brightest spot, use a gyro sensor. (a) True (b) False
32. 32.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
33. 33.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
34. 34.True or false: to find the brightest spot, use a sound sensor. (a) False (b) True
35. 35.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
36. 36.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
37. 37.🧭 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 45°, then right 30°. What does the gyro read now (0° to 359°)?
38. 38.Which job needs a light sensor? (a) measure how far a box is (b) warn if motors get hot (c) find the brightest spot (d) read a QR code
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.🔍 Which sensor helps a robot feel a bump into a wall? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a camera

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