Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 804 · 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 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.🧭 A robot faces east. It does: turn left, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
4. 4.Which of these suits tracks? (a) a flat road (b) a long factory floor (c) moving under water (d) loose sand dunes
5. 5.⚙️ A motor makes 80 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
6. 6.📡 A robot is 220 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
7. 7.🔍 Which sensor helps a robot follow a black line? (a) a sound sensor (b) a light sensor (c) a gyro sensor (d) a touch sensor
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
9. 9.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
10. 10.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
11. 11.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.⬛ The threshold of a light sensor is … (a) the top speed (b) the black/white cut-off (c) the battery size (d) the wheel size
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
15. 15.📡 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) No (b) Yes
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
17. 17.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) tracks (c) propellers (d) wheels
18. 18.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
19. 19.Which of these suits wheels? (a) deep mud (b) loose sand dunes (c) moving under water (d) a hospital corridor
20. 20.🛞 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) goes straight back (b) spins left on the spot (c) turns right (d) spins right on the spot
21. 21.🧭 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 0°. It turns left 135°, then left 120°. What does the gyro read now (0° to 359°)?
22. 22.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 20. What is under the sensor? (a) the black line (b) the white floor
23. 23.Which of these suits wheels? (a) stepping over wide gaps (b) a flat road (c) loose sand dunes (d) soft snow
24. 24.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) wheels (c) legs (d) tracks
25. 25.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) white (d) water
26. 26.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) in opposite directions (c) one up, one down (d) they do not turn
27. 27.True or false: to read a QR code, use a camera. (a) False (b) True
28. 28.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
30. 30.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
31. 31.🔍 Which sensor helps a robot measure how far a box is? (a) a light sensor (b) a gyro sensor (c) a sound sensor (d) a distance sensor
32. 32.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
33. 33.⚙️ A motor makes 120 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
34. 34.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
35. 35.Which job needs a camera? (a) spot a red ball (b) start on a hand clap (c) know a button is pressed (d) stay balanced upright
36. 36.📡 A robot is 240 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
37. 37.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a wooden box (c) a soft foam cushion (d) a flat wall
39. 39.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) teeth (d) tyres
40. 40.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°

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