Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 622 · 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 motor makes 160 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?
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
3. 3.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
4. 4.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
5. 5.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) legs (c) wheels (d) tracks
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.🧭 A robot faces north. It does: turn left, turn around, turn around. Which way does it face now? (a) east (b) north (c) south (d) west
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) one wheel runs faster (c) it jumps (d) it stops for ever
9. 9.🧭 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 45°, then left 135°. What does the gyro read now (0° to 359°)?
10. 10.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower
11. 11.Which job needs a sound sensor? (a) stop before a wall (b) warn if motors get hot (c) measure a turn angle (d) hear a whistle
12. 12.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
13. 13.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
14. 14.Which job needs a touch sensor? (a) feel a bump into a wall (b) stop before a wall (c) find the brightest spot (d) read a QR code
15. 15.🧭 A robot faces west. It does: turn left, turn right, turn around, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
17. 17.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
18. 18.Which job needs a camera? (a) read a QR code (b) start on a hand clap (c) follow a black line (d) know a button is pressed
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points up and right (c) points left (d) points up and left
21. 21.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a sound sensor (c) a touch sensor (d) a camera
22. 22.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
23. 23.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
25. 25.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
26. 26.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 8 seconds (in cm)?
27. 27.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
29. 29.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
30. 30.True or false: “loose sand dunes” suits tracks. (a) True (b) False
31. 31.🧭 A robot faces south. It does: turn around, turn right, turn around, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
32. 32.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
35. 35.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
36. 36.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) faster but weaker (c) slower but stronger (d) at the same speed
37. 37.📡 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)?
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.True or false: to stop before a wall, use a camera. (a) False (b) True

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