Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 275 · 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.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
2. 2.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 180° (d) 45°
3. 3.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
4. 4.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
5. 5.⚙️ A motor makes 20 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?
6. 6.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.True or false: “a flat road” suits wheels. (a) False (b) True
8. 8.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
9. 9.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) black (d) water
10. 10.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
11. 11.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a soft foam cushion (d) a flat wall
12. 12.True or false: “stepping over wide gaps” suits tracks. (a) True (b) False
13. 13.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and right (b) points up and left (c) points left (d) points straight up
15. 15.🔍 Which sensor helps a robot read a QR code? (a) a gyro sensor (b) a distance sensor (c) a camera (d) a temperature sensor
16. 16.🛞 Circumference = π × … (a) diameter (b) radius only (c) weight (d) speed
17. 17.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
18. 18.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
19. 19.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
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 90°. It turns left 135°, then right 135°. What does the gyro read now (0° to 359°)?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
25. 25.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) teeth (d) spokes
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 21. What is under the sensor? (a) the black line (b) the white floor
27. 27.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
30. 30.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
31. 31.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
32. 32.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 360° (d) 180°
33. 33.🧭 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 60°, then right 120°. What does the gyro read now (0° to 359°)?
34. 34.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a bat (d) a goldfish
36. 36.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
39. 39.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
40. 40.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) propellers (c) tracks (d) legs

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