Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 573 · 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 job needs a light sensor? (a) measure a turn angle (b) follow a black line (c) hear a whistle (d) feel a bump into a wall
2. 2.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) tracks (c) propellers (d) wheels
3. 3.🧭 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 left 120°, then right 45°. What does the gyro read now (0° to 359°)?
4. 4.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
5. 5.True or false: “flying over a field” suits wheels. (a) False (b) True
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
7. 7.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a temperature sensor (c) a gyro sensor (d) a light sensor
8. 8.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
9. 9.⚙️ A motor makes 50 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
10. 10.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
11. 11.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
12. 12.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 7/22 (d) 2/7
13. 13.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) never important (d) small (fast, weak)
14. 14.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) stays still (b) goes straight forward (c) goes straight back (d) spins left on the spot
15. 15.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
16. 16.True or false: “a field of tall boulders” suits legs. (a) False (b) True
17. 17.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 340 cm (d) 3 cm
18. 18.📡 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)?
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 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
21. 21.Which of these suits tracks? (a) crossing stepping-stones (b) hovering over a roof (c) a smooth classroom floor (d) loose sand dunes
22. 22.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
23. 23.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
24. 24.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
25. 25.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
26. 26.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
27. 27.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
28. 28.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
29. 29.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) it uses a sail (d) one wheel runs faster
30. 30.🧭 A robot spins 15° every second. How many seconds does it take to turn 180°?
31. 31.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) turns right (c) stays still (d) turns left
32. 32.📡 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)?
33. 33.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
34. 34.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 180° (d) 90°
35. 35.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
36. 36.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
37. 37.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a sound sensor (c) a camera (d) a light sensor
39. 39.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor

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