Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 259 · 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 drives the wheels? (a) a DC motor (b) a servo motor
2. 2.📡 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)?
3. 3.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
4. 4.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) they never tire (c) harder to balance (d) too fast on floors
5. 5.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a sound sensor
6. 6.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
7. 7.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
8. 8.🦾 A servo program runs:
   angle = 180
   angle = angle − 50
   angle = angle − 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
10. 10.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
13. 13.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the right sensor (d) under the left sensor
14. 14.🛞 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) goes straight back (b) turns right (c) spins right on the spot (d) goes straight forward
15. 15.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
16. 16.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
17. 17.True or false: “soft snow” suits legs. (a) False (b) True
18. 18.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
19. 19.🧭 How many degrees is a full turn? (a) 360° (b) 90° (c) 100° (d) 180°
20. 20.Which of these suits wheels? (a) a field of tall boulders (b) loose sand dunes (c) a hospital corridor (d) deep mud
21. 21.🧭 A robot should turn right 45°, but its gyro shows it turned 37°. How many degrees must it turn more to the right?
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
23. 23.⚙️ A motor makes 100 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
24. 24.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.Which job needs a touch sensor? (a) follow a black line (b) hear a whistle (c) spot a red ball (d) feel a bump into a wall
26. 26.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
27. 27.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
28. 28.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
29. 29.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
30. 30.⚙️ A 16-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
31. 31.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they spin in the air (d) they are round
32. 32.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
34. 34.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
35. 35.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
36. 36.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) backwards (d) faster
37. 37.🧭 A robot faces south. It does: turn left, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
38. 38.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black line (c) a black surface (d) a dark tunnel
39. 39.Which of these suits propellers? (a) stepping over wide gaps (b) crossing stepping-stones (c) moving under water (d) deep mud
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor

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