Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 392 · 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 should turn right 180°, but its gyro shows it turned 190°. How many degrees must it turn back to the left?
2. 2.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
3. 3.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
4. 4.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) harder to balance (d) they are too cheap
5. 5.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 3 (c) 2 (d) 1
6. 6.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) fast and easy on floors (d) they climb stairs
7. 7.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 66. What is under the sensor? (a) the black line (b) the white floor
8. 8.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to be heavier (d) to know their world
10. 10.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
12. 12.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
14. 14.Which job needs a gyro sensor? (a) feel a bump into a wall (b) hear a whistle (c) stay balanced upright (d) spot a red ball
15. 15.🧭 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 right 30°, then left 120°, then left 45°. What does the gyro read now (0° to 359°)?
16. 16.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
17. 17.True or false: “a smooth classroom floor” suits wheels. (a) True (b) False
18. 18.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
19. 19.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
20. 20.🧭 A robot should turn right 90°, but its gyro shows it turned 83°. How many degrees must it turn more to the right?
21. 21.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) wheels (c) legs (d) propellers
22. 22.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🧭 A robot faces south. It does: turn left, turn around, turn left, turn left. Which way does it face now? (a) west (b) south (c) north (d) east
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
27. 27.🛞 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) goes straight back (b) stays still (c) spins right on the spot (d) goes straight forward
28. 28.Which job needs a camera? (a) follow a black line (b) find the brightest spot (c) stay balanced upright (d) spot a red ball
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
30. 30.Which job needs a sound sensor? (a) hear a whistle (b) feel a bump into a wall (c) know a button is pressed (d) find the brightest spot
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
32. 32.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) one up, one down (d) in opposite directions
33. 33.🛞 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)? =
34. 34.True or false: to follow a black line, use a light sensor. (a) False (b) True
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 20. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
36. 36.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 12 seconds (in cm)?
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True

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