Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 393 · 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.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
2. 2.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 360°?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
5. 5.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) west (b) east (c) south (d) north
6. 6.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a servo (d) a caster wheel
7. 7.🦾 A servo program runs:
   angle = 160
   angle = angle − 50
   angle = angle − 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.🧭 A robot faces east. It does: turn left, turn right, turn right. Which way does it face now? (a) north (b) east (c) south (d) west
9. 9.⚙️ A 12-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
10. 10.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
11. 11.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
14. 14.📡 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)?
15. 15.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) turn by exact angles (d) hear claps
16. 16.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.True or false: “a smooth classroom floor” suits propellers. (a) False (b) True
18. 18.True or false: to measure a turn angle, use a temperature sensor. (a) True (b) False
19. 19.Which of these suits wheels? (a) stepping over wide gaps (b) loose sand dunes (c) crossing stepping-stones (d) a flat road
20. 20.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 14 seconds (in cm)?
21. 21.Which of these suits propellers? (a) a long factory floor (b) flying over a field (c) deep mud (d) a flat road
22. 22.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.📡 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
24. 24.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
25. 25.Which job needs a light sensor? (a) stay balanced upright (b) follow a black line (c) know a button is pressed (d) hear a whistle
26. 26.🧭 A robot should turn right 90°, but its gyro shows it turned 88°. How many degrees must it turn more to the right?
27. 27.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
28. 28.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
29. 29.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
30. 30.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) black (d) white
31. 31.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
32. 32.🦾 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 left (b) points up and right (c) points left (d) points right
33. 33.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
34. 34.True or false: to read a QR code, use a distance sensor. (a) True (b) False
35. 35.🧭 A robot faces west. It does: turn left, turn right, turn around. Which way does it face now? (a) east (b) north (c) south (d) west
36. 36.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
37. 37.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
38. 38.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
39. 39.⚙️ The gear fixed to the motor is called the … (a) tyre (b) idler gear (c) driver gear (d) driven gear
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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