Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 127 · 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.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) wheels (c) legs (d) tracks
2. 2.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 45 times. How many times does the driven gear turn?
3. 3.🧭 A robot should turn right 180°, but its gyro shows it turned 165°. How many degrees must it turn more to the right?
4. 4.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
5. 5.📡 A robot is 130 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)?
6. 6.🧭 A robot should turn right 90°, but its gyro shows it turned 95°. How many degrees must it turn back to the left?
7. 7.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a distance sensor (c) a gyro sensor (d) a sound sensor
8. 8.Which job needs a gyro sensor? (a) spot a red ball (b) feel a bump into a wall (c) measure a turn angle (d) know a button is pressed
9. 9.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
10. 10.🧭 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 45°, then right 30°, then left 135°. What does the gyro read now (0° to 359°)?
11. 11.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
12. 12.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) legs (c) propellers (d) wheels
13. 13.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
14. 14.🧭 A robot faces south. It does: turn left, turn left, turn right, turn left. Which way does it face now? (a) north (b) south (c) east (d) west
15. 15.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
16. 16.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) propellers (d) tracks
17. 17.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
18. 18.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
19. 19.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
20. 20.⚙️ A 24-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
21. 21.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
22. 22.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
23. 23.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
25. 25.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
26. 26.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 2 (d) 4
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion
29. 29.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) nowhere (d) backwards
30. 30.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 45 times. How many times does the driven gear turn?
31. 31.True or false: “a field of tall boulders” suits tracks. (a) True (b) False
32. 32.🧭 A robot faces east. It does: turn around, turn around, turn around, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
33. 33.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
35. 35.📡 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) Yes (b) No
36. 36.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
39. 39.Which of these suits legs? (a) a hospital corridor (b) a muddy building site (c) a field of tall boulders (d) loose sand dunes
40. 40.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) harder to balance (c) they never tire (d) too fast on floors

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