Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 50 · 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 runs forward and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) spins right on the spot (c) turns left (d) turns right
2. 2.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 180° (d) 360°
3. 3.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
5. 5.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
6. 6.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
7. 7.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
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 30°, then left 135°. What does the gyro read now (0° to 359°)?
9. 9.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
11. 11.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
12. 12.🧭 A robot faces north. It does: turn left, turn right. Which way does it face now? (a) east (b) south (c) north (d) west
13. 13.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
14. 14.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
15. 15.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
16. 16.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
17. 17.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times faster (d) 3 times bigger
18. 18.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
19. 19.Which job needs a touch sensor? (a) follow a black line (b) measure a turn angle (c) know a button is pressed (d) hear a whistle
20. 20.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
21. 21.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
22. 22.Which of these suits legs? (a) soft snow (b) moving under water (c) a muddy building site (d) stepping over wide gaps
23. 23.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
24. 24.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 71. What is under the sensor? (a) the black line (b) the white floor
25. 25.🛞 Circumference = π × … (a) diameter (b) radius only (c) weight (d) speed
26. 26.📡 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)?
27. 27.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
28. 28.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) tracks (c) wheels (d) legs
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
31. 31.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
32. 32.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
33. 33.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
34. 34.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
35. 35.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) tracks (c) legs (d) wheels
37. 37.🦾 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 straight up (c) points up and left (d) points right
38. 38.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
39. 39.🛞 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 6 times. How far does the robot roll (in cm)?
40. 40.Which job needs a sound sensor? (a) stay balanced upright (b) start on a hand clap (c) stop before a wall (d) feel a bump into a wall

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