Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 223 · 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 light sensor reads below 50 over a black line and above 50 over the white floor. It reads 61. What is under the sensor? (a) the black line (b) the white floor
2. 2.🧭 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 180°, then left 135°, then right 90°. What does the gyro read now (0° to 359°)?
3. 3.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
5. 5.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) the same direction (d) in opposite directions
6. 6.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) north (b) east (c) west (d) south
7. 7.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
8. 8.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a light sensor (c) a camera (d) a touch sensor
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.True or false: “deep mud” suits propellers. (a) False (b) True
13. 13.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
14. 14.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
15. 15.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
16. 16.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 75. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
18. 18.🛞 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 back (b) spins right on the spot (c) turns left (d) stays still
19. 19.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 81. What is under the sensor? (a) the black line (b) the white floor
20. 20.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
21. 21.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
22. 22.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
23. 23.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
24. 24.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
27. 27.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
28. 28.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a dark tunnel (d) a white surface
29. 29.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
30. 30.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
31. 31.📡 A robot is 230 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 11 seconds (in cm)?
32. 32.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 3 (d) 2
33. 33.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) wheel size (d) motor volts
34. 34.Which job needs a temperature sensor? (a) know a button is pressed (b) spot a red ball (c) warn if motors get hot (d) start on a hand clap
35. 35.⚙️ A motor makes 120 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?
36. 36.🧭 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 45°, then left 45°. What does the gyro read now (0° to 359°)?
37. 37.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
38. 38.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
39. 39.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
40. 40.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?

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