Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 856 · 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: “soft snow”? (a) legs (b) propellers (c) tracks (d) wheels
2. 2.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.🧭 A robot should turn right 45°, but its gyro shows it turned 38°. How many degrees must it turn more to the right?
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
6. 6.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) slower but stronger (d) at the same speed
7. 7.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
9. 9.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 90° (d) 360°
10. 10.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
11. 11.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line
12. 12.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
13. 13.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
15. 15.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
16. 16.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
17. 17.🧭 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 45°, then left 30°, then right 180°. What does the gyro read now (0° to 359°)?
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.⚙️ A 12-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
21. 21.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🧭 A robot faces west. It does: turn around, turn around, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
23. 23.True or false: to stop before a wall, use a touch sensor. (a) False (b) True
24. 24.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
25. 25.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
26. 26.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the right sensor (d) under the left sensor
27. 27.🧭 A robot spins 15° every second. How many seconds does it take to turn 75°?
28. 28.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to use more power (d) to look colourful
29. 29.Which of these suits wheels? (a) a field of tall boulders (b) a long factory floor (c) soft snow (d) moving under water
30. 30.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) colour (d) turning (rotation)
31. 31.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an output (d) an input
32. 32.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 180° (d) 360°
33. 33.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
34. 34.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.Which job needs a light sensor? (a) stay balanced upright (b) know a button is pressed (c) hear a whistle (d) find the brightest spot
36. 36.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track
37. 37.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
38. 38.🛞 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) curves to the right (c) goes straight forward
39. 39.🔍 Which sensor helps a robot stay balanced upright? (a) a sound sensor (b) a distance sensor (c) a camera (d) a gyro sensor
40. 40.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black line (d) a black surface

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