Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 356 · 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 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.⚙️ 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
4. 4.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
5. 5.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) legs (c) propellers (d) wheels
6. 6.True or false: “soft snow” suits tracks. (a) False (b) True
7. 7.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) colour (d) turning (rotation)
8. 8.Which job needs a gyro sensor? (a) start on a hand clap (b) follow a black line (c) measure a turn angle (d) find the brightest spot
9. 9.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
10. 10.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
11. 11.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
12. 12.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) turns left (b) spins right on the spot (c) turns right (d) goes straight forward
14. 14.🔦 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 left sensor (b) the right sensor (c) both sensors (d) neither sensor
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
16. 16.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
17. 17.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
18. 18.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
19. 19.🧭 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 60°, then left 120°. What does the gyro read now (0° to 359°)?
20. 20.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
21. 21.🛞 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) spins left on the spot (b) turns left (c) stays still (d) goes straight forward
22. 22.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
24. 24.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
25. 25.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) turns right (b) goes straight forward (c) goes straight back (d) stays still
26. 26.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a wheel (d) a gear
28. 28.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) faster but weaker (d) not at all
29. 29.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
31. 31.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🛞 Circumference = π × … (a) weight (b) radius only (c) diameter (d) speed
33. 33.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
34. 34.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
35. 35.🧭 A robot spins 15° every second. How many seconds does it take to turn 345°?
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
37. 37.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
38. 38.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points straight up
39. 39.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
40. 40.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?

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