Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 728 · 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 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it uses a sail (d) it stops for ever
3. 3.True or false: “flying over a field” suits legs. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
5. 5.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the black/white cut-off (d) the top speed
6. 6.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) white (d) water
7. 7.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 44. What is under the sensor? (a) the black line (b) the white floor
8. 8.🧭 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 90°, then right 135°, then left 45°. What does the gyro read now (0° to 359°)?
9. 9.Which job needs a distance sensor? (a) start on a hand clap (b) hear a whistle (c) know a button is pressed (d) stop before a wall
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
11. 11.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a gyro sensor (c) a light sensor (d) a sound sensor
12. 12.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
14. 14.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a sound sensor (c) a gyro sensor (d) a distance sensor
15. 15.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) legs (c) wheels (d) propellers
16. 16.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🧭 A robot should turn right 180°, but its gyro shows it turned 185°. How many degrees must it turn back to the left?
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
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.⚙️ 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
21. 21.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 360° (d) 90°
22. 22.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) propellers (c) wheels (d) legs
23. 23.🛞 Circumference = π × … (a) radius only (b) weight (c) speed (d) diameter
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
25. 25.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 35. What is under the sensor? (a) the white floor (b) the black line
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
27. 27.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
28. 28.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion
29. 29.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
30. 30.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
31. 31.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
32. 32.🧭 A robot faces north. It does: turn left, turn right, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
33. 33.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 90. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🧭 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 60°, then right 120°. What does the gyro read now (0° to 359°)?
37. 37.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
38. 38.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) propellers (c) tracks (d) legs
39. 39.🧭 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 45°, then left 30°. What does the gyro read now (0° to 359°)?
40. 40.🧭 A robot faces south. It does: turn right, turn right, turn around. Which way does it face now? (a) east (b) west (c) north (d) south

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