Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 603 · 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 distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.Which job needs a camera? (a) stop before a wall (b) spot a red ball (c) measure a turn angle (d) stay balanced upright
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) faster and weaker (c) at the same speed (d) not at all
6. 6.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) black (d) the sky
7. 7.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points left (c) points right (d) points up and left
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
9. 9.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times faster (d) 3 times bigger
10. 10.Which of these suits wheels? (a) a field of tall boulders (b) hovering over a roof (c) crossing stepping-stones (d) a long factory floor
11. 11.🧭 A robot faces east. It does: turn around, turn left, turn left. Which way does it face now? (a) east (b) west (c) north (d) south
12. 12.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
14. 14.True or false: to stop before a wall, use a camera. (a) False (b) True
15. 15.⚙️ A motor makes 140 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
16. 16.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
17. 17.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
18. 18.🧭 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 90°, then left 30°, then left 45°. What does the gyro read now (0° to 359°)?
19. 19.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a touch sensor (d) a gyro sensor
21. 21.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) they never tire (d) harder to balance
22. 22.🧭 A robot faces north. It does: turn right, turn right, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
23. 23.🧭 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 45°. What does the gyro read now (0° to 359°)?
24. 24.🛞 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) goes straight forward (b) curves to the left (c) curves to the right
25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
26. 26.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
27. 27.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
28. 28.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a light sensor (c) a camera (d) a touch sensor
29. 29.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
30. 30.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
31. 31.🧭 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 180°, then right 180°, then left 30°. What does the gyro read now (0° to 359°)?
32. 32.🔍 Why do robots need sensors? (a) to know their world (b) to be heavier (c) to use more power (d) to look colourful
33. 33.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) sound is slow (d) the sensor is half
34. 34.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
35. 35.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.⚙️ 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 big driver gear (b) a small driver gear
37. 37.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the wheel size (d) the top speed
38. 38.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
39. 39.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a sound sensor (c) a camera (d) a gyro sensor
40. 40.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors

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