Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 81 · 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 robot spins 60° every second. How many seconds does it take to turn 120°?
2. 2.Which job needs a touch sensor? (a) start on a hand clap (b) measure how far a box is (c) hear a whistle (d) know a button is pressed
3. 3.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
4. 4.🛞 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) goes straight back (b) turns right (c) spins left on the spot (d) spins right on the spot
5. 5.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 31. What is under the sensor? (a) the black line (b) the white floor
6. 6.🦾 A servo program runs:
   angle = 60
   angle = angle + 30
   angle = angle + 40
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.🛞 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) spins right on the spot (b) goes straight forward (c) stays still (d) goes straight back
8. 8.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
9. 9.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an output (d) an input
10. 10.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
11. 11.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
12. 12.🛞 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 3 times. How far does the robot roll (in cm)?
13. 13.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
14. 14.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 64. What is under the sensor? (a) the white floor (b) the black line
15. 15.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line
16. 16.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.🧭 A robot faces east. It does: turn right, turn left, turn right. Which way does it face now? (a) west (b) south (c) east (d) north
18. 18.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
19. 19.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
20. 20.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
22. 22.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and right (c) points straight up (d) points left
24. 24.🔍 Which sensor helps a robot find the brightest spot? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a light sensor
25. 25.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
26. 26.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
27. 27.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
28. 28.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
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 95. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
32. 32.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
33. 33.⚙️ A motor makes 250 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?
34. 34.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a white surface (d) a dark tunnel
35. 35.Which of these suits wheels? (a) a smooth classroom floor (b) crossing stepping-stones (c) moving under water (d) a muddy building site
36. 36.Which job needs a sound sensor? (a) spot a red ball (b) stay balanced upright (c) find the brightest spot (d) hear a whistle
37. 37.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) legs (c) wheels (d) tracks
38. 38.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points up and left (c) points up and right (d) points left
39. 39.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
40. 40.🔍 Why do robots need sensors? (a) to know their world (b) to look colourful (c) to be heavier (d) to use more power

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