Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 111 · 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.True or false: “loose sand dunes” suits wheels. (a) True (b) False
2. 2.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 58. What is under the sensor? (a) the black line (b) the white floor
3. 3.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
5. 5.True or false: “a flat road” suits wheels. (a) False (b) True
6. 6.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
7. 7.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) propellers (c) legs (d) wheels
8. 8.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the white floor (b) the black line
9. 9.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
10. 10.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 154 cm?
11. 11.🧭 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 90°, then right 30°. What does the gyro read now (0° to 359°)?
12. 12.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a sound sensor
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
14. 14.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
15. 15.Which job needs a gyro sensor? (a) stop before a wall (b) hear a whistle (c) stay balanced upright (d) know a button is pressed
16. 16.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
17. 17.📡 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
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
19. 19.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
20. 20.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
21. 21.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 45° (d) 360°
22. 22.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) faster but weaker (d) not at all
23. 23.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
24. 24.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
25. 25.Which job needs a distance sensor? (a) find the brightest spot (b) stop before a wall (c) spot a red ball (d) measure a turn angle
26. 26.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) nowhere (d) backwards
28. 28.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) propellers (c) tracks (d) wheels
29. 29.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 180° (d) 100°
30. 30.🔢 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
31. 31.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 16. What is under the sensor? (a) the black line (b) the white floor
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
33. 33.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a light sensor (c) a gyro sensor (d) a camera
34. 34.📡 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 1 second (in cm)?
35. 35.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
36. 36.⚙️ 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 small driver gear (b) a big driver gear
37. 37.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) to make it smaller (d) sound is slow
38. 38.📡 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 10 seconds (in cm)?
39. 39.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a touch sensor (c) a camera (d) a temperature sensor
40. 40.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a sound sensor (c) a distance sensor (d) a temperature sensor

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