Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 216 · 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 robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) spins right on the spot (c) goes straight back (d) goes straight forward
2. 2.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
4. 4.True or false: “deep mud” suits tracks. (a) True (b) False
5. 5.Which of these suits wheels? (a) a muddy building site (b) flying over a field (c) a smooth classroom floor (d) deep mud
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
7. 7.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
9. 9.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
10. 10.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
11. 11.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
12. 12.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
14. 14.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
15. 15.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
16. 16.Which of these suits wheels? (a) loose sand dunes (b) a hospital corridor (c) stepping over wide gaps (d) crossing stepping-stones
17. 17.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
19. 19.🧭 A robot spins 30° every second. How many seconds does it take to turn 150°?
20. 20.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a white surface (d) a dark tunnel
21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
22. 22.True or false: to warn if motors get hot, use a camera. (a) False (b) True
23. 23.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
24. 24.⚙️ 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
25. 25.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to be heavier (d) to know their world
26. 26.🧭 A robot should turn right 90°, but its gyro shows it turned 105°. How many degrees must it turn back to the left?
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 85. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) turns left (b) stays still (c) turns right (d) goes straight back
30. 30.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
31. 31.⚙️ A 20-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
32. 32.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
33. 33.🛞 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
34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🧭 A robot should turn right 90°, but its gyro shows it turned 91°. How many degrees must it turn back to the left?
36. 36.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a distance sensor
37. 37.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
38. 38.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) legs (c) propellers (d) tracks
39. 39.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
40. 40.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°

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