Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 70 · 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 has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight back (b) turns right (c) spins left on the spot (d) turns left
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
3. 3.🧭 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 60°, then right 135°, then right 60°. What does the gyro read now (0° to 359°)?
4. 4.🧭 A robot spins 45° every second. How many seconds does it take to turn 90°?
5. 5.🛞 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 right (c) curves to the left
6. 6.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
7. 7.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.🛞 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
9. 9.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) nowhere (d) faster
10. 10.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
11. 11.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
12. 12.🧭 A robot faces south. It does: turn left, turn right, turn left, turn left. Which way does it face now? (a) north (b) west (c) south (d) east
13. 13.🧭 A robot should turn right 45°, but its gyro shows it turned 58°. How many degrees must it turn back to the left?
14. 14.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
15. 15.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) propellers (c) legs (d) wheels
17. 17.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) propellers (c) legs (d) wheels
18. 18.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 90° (d) 180°
19. 19.True or false: “a long factory floor” suits tracks. (a) True (b) False
20. 20.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 5 seconds (in cm)?
21. 21.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
24. 24.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) a wheel (d) an input
25. 25.📡 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)?
26. 26.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
27. 27.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
28. 28.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) driver gear (c) tyre (d) idler gear
29. 29.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
30. 30.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
31. 31.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
32. 32.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) small (fast, weak) (d) big (slow and strong)
33. 33.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is wet (d) black is hot
34. 34.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
35. 35.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
36. 36.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) between the two sensors (d) under the right sensor
37. 37.🧭 A robot faces east. It does: turn left, turn right, turn around. Which way does it face now? (a) south (b) west (c) north (d) east
38. 38.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
39. 39.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
40. 40.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?

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