Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 51 · 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 muddy building site”? (a) tracks (b) legs (c) wheels (d) propellers
2. 2.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 2/7 (d) 22/7
3. 3.🧭 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 0°. It turns left 90°, then left 120°, then right 120°. What does the gyro read now (0° to 359°)?
4. 4.🛞 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 6 times. How far does the robot roll (in cm)?
5. 5.🧭 A robot should turn right 90°, but its gyro shows it turned 81°. How many degrees must it turn more to the right?
6. 6.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
7. 7.🛞 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)? =
8. 8.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a sound sensor (c) a temperature sensor (d) a distance sensor
9. 9.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 594 cm?
10. 10.🛞 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) turns right (b) goes straight back (c) turns left (d) spins left on the spot
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) turns right (b) spins right on the spot (c) stays still (d) goes straight forward
12. 12.True or false: to warn if motors get hot, use a touch sensor. (a) True (b) False
13. 13.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) white (d) water
14. 14.True or false: to measure a turn angle, use a camera. (a) True (b) False
15. 15.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) tracks (c) wheels (d) propellers
16. 16.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
18. 18.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
19. 19.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 68. What is under the sensor? (a) the white floor (b) the black line
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
22. 22.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 360° (c) 180° (d) 90°
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
25. 25.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.True or false: “a flat road” suits tracks. (a) True (b) False
27. 27.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
28. 28.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
29. 29.⚙️ A 12-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
31. 31.Which of these suits propellers? (a) deep mud (b) hovering over a roof (c) a long factory floor (d) a field of tall boulders
32. 32.🧭 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 left 30°, then left 45°, then left 90°. What does the gyro read now (0° to 359°)?
33. 33.Which of these suits wheels? (a) a smooth classroom floor (b) stepping over wide gaps (c) a field of tall boulders (d) crossing stepping-stones
34. 34.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
36. 36.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
37. 37.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points up and right (c) points left (d) points right
38. 38.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
40. 40.🧭 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 180°, then left 30°, then right 90°. What does the gyro read now (0° to 359°)?

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