Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 413 · 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.Which of these suits propellers? (a) moving under water (b) stepping over wide gaps (c) a long factory floor (d) a field of tall boulders
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
3. 3.⚙️ A motor makes 180 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
4. 4.🧭 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 120°, then right 135°, then right 180°. What does the gyro read now (0° to 359°)?
5. 5.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a gyro sensor
6. 6.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
7. 7.📡 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)?
8. 8.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
9. 9.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
10. 10.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
11. 11.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) propellers (d) wheels
12. 12.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
13. 13.Which job needs a touch sensor? (a) find the brightest spot (b) follow a black line (c) feel a bump into a wall (d) hear a whistle
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) small (fast, weak) (c) never important (d) zero
15. 15.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
16. 16.True or false: “a hospital corridor” suits wheels. (a) False (b) True
17. 17.📡 A robot is 170 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
18. 18.🧭 A robot faces east. It does: turn left, turn left, turn right, turn left. Which way does it face now? (a) north (b) south (c) east (d) west
19. 19.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it jumps (c) it stops for ever (d) one wheel runs faster
20. 20.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 180° (d) 360°
21. 21.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🧭 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 180°, then right 135°. What does the gyro read now (0° to 359°)?
23. 23.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 180° (d) 45°
24. 24.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a camera (c) a temperature sensor (d) a sound sensor
25. 25.True or false: to stop before a wall, use a gyro sensor. (a) False (b) True
26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
27. 27.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a gyro sensor (c) a camera (d) a light sensor
28. 28.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
29. 29.🧭 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 right 60°, then left 45°, then right 30°. What does the gyro read now (0° to 359°)?
30. 30.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
31. 31.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
32. 32.True or false: “a smooth classroom floor” suits legs. (a) True (b) False
33. 33.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
34. 34.Which job needs a gyro sensor? (a) measure a turn angle (b) feel a bump into a wall (c) read a QR code (d) find the brightest spot
35. 35.⚙️ A motor makes 400 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
36. 36.🔍 Which sensor helps a robot feel a bump into a wall? (a) a temperature sensor (b) a sound sensor (c) a camera (d) a touch sensor
37. 37.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster and weaker
38. 38.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
40. 40.True or false: to warn if motors get hot, use a touch sensor. (a) True (b) False

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