Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 448 · 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 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 12 times. How far does the robot roll (in cm)?
2. 2.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they are too cheap (d) they never tire
3. 3.🛞 Circumference = π × … (a) weight (b) radius only (c) speed (d) diameter
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
5. 5.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
6. 6.⚙️ A 30-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
7. 7.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
8. 8.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
9. 9.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) propellers (c) legs (d) wheels
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 left 30°, then left 90°. What does the gyro read now (0° to 359°)?
11. 11.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points left (c) points right (d) points up and left
13. 13.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points right (c) points straight up (d) points up and left
14. 14.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
15. 15.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
16. 16.True or false: “moving under water” suits propellers. (a) True (b) False
17. 17.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
19. 19.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they are shiny (d) they spin in the air
20. 20.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.🛞 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) spins right on the spot (b) turns left (c) stays still (d) goes straight back
22. 22.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
24. 24.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
25. 25.Which of these suits wheels? (a) stepping over wide gaps (b) soft snow (c) a smooth classroom floor (d) loose sand dunes
26. 26.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
27. 27.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
30. 30.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
32. 32.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
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 180°. It turns left 120°, then right 135°. What does the gyro read now (0° to 359°)?
34. 34.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
35. 35.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a wheel (d) a gear
36. 36.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its weight (d) its diameter
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
38. 38.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor

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