Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 126 · 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.🔍 Which sensor helps a robot hear a whistle? (a) a gyro sensor (b) a distance sensor (c) a sound sensor (d) a touch sensor
2. 2.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to look colourful (d) to be heavier
3. 3.🦾 A servo program runs:
   angle = 30
   angle = angle + 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
5. 5.⚙️ 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
6. 6.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) legs (c) tracks (d) wheels
7. 7.🧭 A robot spins 15° every second. How many seconds does it take to turn 330°?
8. 8.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
9. 9.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
10. 10.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) backwards (d) slower
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
13. 13.Which of these suits propellers? (a) flying over a field (b) a long factory floor (c) a flat road (d) crossing stepping-stones
14. 14.🛞 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) goes straight back (b) spins right on the spot (c) stays still (d) turns right
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
17. 17.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 180° (d) 360°
18. 18.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
19. 19.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times bigger (d) 3 times faster
20. 20.🧭 A robot should turn right 90°, but its gyro shows it turned 76°. How many degrees must it turn more to the right?
21. 21.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
22. 22.🧭 A robot spins 15° every second. How many seconds does it take to turn 285°?
23. 23.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
24. 24.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) in opposite directions (d) the same direction
25. 25.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
26. 26.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
27. 27.🛞 Why do most indoor robots use wheels? (a) they float (b) they climb stairs (c) they look funny (d) fast and easy on floors
28. 28.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
29. 29.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) legs (c) propellers (d) tracks
30. 30.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) propellers (c) wheels (d) tracks
31. 31.🦾 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 up and left (b) points right (c) points straight up (d) points up and right
32. 32.True or false: to hear a whistle, use a gyro sensor. (a) True (b) False
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
34. 34.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) tracks (c) legs (d) propellers
35. 35.🔍 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
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
37. 37.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
38. 38.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
39. 39.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
40. 40.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red

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