Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 209 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) motor volts (d) number of gears
4. 4.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
5. 5.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) turns left (c) stays still (d) goes straight forward
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
7. 7.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
8. 8.🧭 A robot faces east. It does: turn left, turn right. Which way does it face now? (a) south (b) west (c) north (d) east
9. 9.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
10. 10.🔍 Why do robots need sensors? (a) to be heavier (b) to use more power (c) to look colourful (d) to know their world
11. 11.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
12. 12.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.Which job needs a touch sensor? (a) measure how far a box is (b) feel a bump into a wall (c) read a QR code (d) measure a turn angle
15. 15.📡 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?
16. 16.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
18. 18.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 1 km (d) 3 cm
19. 19.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
21. 21.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.📡 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)?
23. 23.🛞 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) stays still (c) turns left (d) spins left on the spot
24. 24.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
25. 25.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
26. 26.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) slower but stronger (c) at the same speed (d) not at all
27. 27.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
28. 28.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) propellers (c) wheels (d) tracks
29. 29.📡 A robot is 230 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 11 seconds (in cm)?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
32. 32.Which job needs a temperature sensor? (a) hear a whistle (b) warn if motors get hot (c) start on a hand clap (d) feel a bump into a wall
33. 33.🧭 A robot should turn right 90°, but its gyro shows it turned 92°. How many degrees must it turn back to the left?
34. 34.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
35. 35.🧭 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 90°. It turns right 60°, then right 45°, then right 30°. What does the gyro read now (0° to 359°)?
36. 36.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
37. 37.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
38. 38.📡 A robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 12 seconds (in cm)?
39. 39.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
40. 40.🛞 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 12 times. How far does the robot roll (in cm)?

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