Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 819 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
2. 2.Which of these suits legs? (a) a long factory floor (b) deep mud (c) a field of tall boulders (d) a muddy building site
3. 3.⚙️ A motor makes 200 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
5. 5.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
6. 6.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
7. 7.🛞 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
8. 8.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) the sensor is half (d) sound is slow
9. 9.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) backwards (d) nowhere
11. 11.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
12. 12.🔍 Which sensor helps a robot measure how far a box is? (a) a gyro sensor (b) a light sensor (c) a camera (d) a distance sensor
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) turns left (d) goes straight back
15. 15.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 1 km (d) 3 cm
16. 16.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
17. 17.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
18. 18.🧭 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 left 60°. What does the gyro read now (0° to 359°)?
19. 19.⚙️ A motor makes 60 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
20. 20.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a gyro sensor
21. 21.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the top speed (d) the wheel size
22. 22.🧭 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 right 90°, then right 90°, then right 135°. What does the gyro read now (0° to 359°)?
23. 23.Which job needs a distance sensor? (a) feel a bump into a wall (b) hear a whistle (c) start on a hand clap (d) stop before a wall
24. 24.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
25. 25.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a distance sensor (c) a camera (d) a temperature sensor
26. 26.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
27. 27.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
28. 28.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) wheels (c) propellers (d) tracks
29. 29.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
30. 30.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
32. 32.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
35. 35.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
36. 36.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) a gear (d) an output
37. 37.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
38. 38.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
39. 39.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor

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