Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 747 · 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: to feel a bump into a wall, use a light sensor. (a) False (b) True
2. 2.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its diameter (d) its circumference
3. 3.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
4. 4.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) legs (c) propellers (d) tracks
5. 5.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) sound is slow (d) to make it smaller
6. 6.🧭 A robot faces east. It does: turn around, turn right, turn right, turn left. Which way does it face now? (a) south (b) north (c) west (d) east
7. 7.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
9. 9.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 90° (d) 180°
10. 10.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
11. 11.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
12. 12.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the wheel size (d) the black/white cut-off
13. 13.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
14. 14.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
15. 15.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
16. 16.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they never tire (c) they are too cheap (d) too fast on floors
17. 17.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black soaks up light (d) black is hot
18. 18.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
19. 19.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
21. 21.🛞 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
22. 22.True or false: to spot a red ball, use a light sensor. (a) True (b) False
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
24. 24.⚙️ A motor makes 200 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
25. 25.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
27. 27.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1056 cm?
28. 28.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a touch sensor (c) a light sensor (d) a sound sensor
29. 29.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
30. 30.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
31. 31.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 360° (d) 90°
32. 32.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a sound sensor
33. 33.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
34. 34.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
35. 35.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
36. 36.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) legs (b) tracks (c) wheels (d) propellers
37. 37.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
38. 38.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they are shiny (d) they spread the weight
40. 40.Which job needs a distance sensor? (a) start on a hand clap (b) measure how far a box is (c) feel a bump into a wall (d) follow a black line

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