Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 830 · 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 light sensor reads below 60 over a black line and above 60 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
2. 2.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°
3. 3.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
5. 5.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
6. 6.⚙️ 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
7. 7.🛞 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) turns right (b) turns left (c) spins left on the spot (d) goes straight forward
8. 8.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
9. 9.⚙️ A 15-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
10. 10.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 360° (d) 180°
11. 11.Which of these suits propellers? (a) hovering over a roof (b) a long factory floor (c) a smooth classroom floor (d) loose sand dunes
12. 12.Which job needs a sound sensor? (a) start on a hand clap (b) follow a black line (c) read a QR code (d) know a button is pressed
13. 13.Which job needs a gyro sensor? (a) hear a whistle (b) follow a black line (c) measure a turn angle (d) spot a red ball
14. 14.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to look colourful (d) to know their world
15. 15.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
16. 16.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
17. 17.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) faster (d) backwards
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
19. 19.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
22. 22.True or false: to find the brightest spot, use a sound sensor. (a) True (b) False
23. 23.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) west (b) north (c) east (d) south
24. 24.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 90° (d) 180°
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🧭 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 right 120°, then right 120°, then left 45°. What does the gyro read now (0° to 359°)?
27. 27.⚙️ A motor makes 150 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
28. 28.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
29. 29.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
30. 30.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they climb stairs (d) they look funny
31. 31.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
32. 32.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
33. 33.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
35. 35.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
36. 36.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
37. 37.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
38. 38.True or false: “flying over a field” suits propellers. (a) True (b) False
39. 39.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
40. 40.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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