Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 120 · 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 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
2. 2.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 4 (c) 1 (d) 3
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
4. 4.Which job needs a gyro sensor? (a) spot a red ball (b) find the brightest spot (c) hear a whistle (d) measure a turn angle
5. 5.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
7. 7.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
8. 8.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) tracks (c) wheels (d) propellers
9. 9.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
10. 10.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
11. 11.🧭 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 90°, then right 45°. What does the gyro read now (0° to 359°)?
12. 12.True or false: to warn if motors get hot, use a sound sensor. (a) False (b) True
13. 13.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.🛞 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 forward. What does the robot do? (a) goes straight forward (b) turns right (c) spins left on the spot (d) goes straight back
16. 16.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
17. 17.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the black line (b) the white floor
18. 18.🧭 A robot spins 45° every second. How many seconds does it take to turn 90°?
19. 19.📡 A robot is 230 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 9 seconds (in cm)?
20. 20.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) never important (d) small (fast, weak)
21. 21.True or false: “soft snow” suits tracks. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
23. 23.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a black surface (d) a white surface
24. 24.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
25. 25.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
27. 27.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) a gear (d) an input
29. 29.⚙️ 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
30. 30.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
31. 31.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 39. What is under the sensor? (a) the black line (b) the white floor
32. 32.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
33. 33.Which job needs a gyro sensor? (a) start on a hand clap (b) stay balanced upright (c) know a button is pressed (d) warn if motors get hot
34. 34.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
35. 35.🧭 A robot spins 45° every second. How many seconds does it take to turn 180°?
36. 36.🧭 A robot faces north. It does: turn around, turn right, turn around, turn left. Which way does it face now? (a) east (b) north (c) west (d) south
37. 37.📡 A robot is 120 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
38. 38.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
39. 39.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
40. 40.🦾 A servo moves from 30° to 160°. How many degrees does it turn?

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