Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 839 · 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 light sensor reads below 50 over a black line and above 50 over the white floor. It reads 66. What is under the sensor? (a) the black line (b) the white floor
2. 2.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
3. 3.📡 A robot is 190 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
4. 4.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
5. 5.🔍 Which sensor helps a robot measure a turn angle? (a) a sound sensor (b) a gyro sensor (c) a distance sensor (d) a light sensor
6. 6.📡 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
7. 7.Which of these suits wheels? (a) a long factory floor (b) soft snow (c) a muddy building site (d) stepping over wide gaps
8. 8.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
9. 9.🧭 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 135°, then right 30°. What does the gyro read now (0° to 359°)?
10. 10.True or false: “crossing stepping-stones” suits wheels. (a) False (b) True
11. 11.⚙️ A 10-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
13. 13.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
14. 14.⚙️ 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
15. 15.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
16. 16.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
18. 18.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
19. 19.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
20. 20.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 40
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
23. 23.🔍 Which sensor helps a robot spot a red ball? (a) a temperature sensor (b) a touch sensor (c) a distance sensor (d) a camera
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
26. 26.🧭 A robot spins 45° every second. How many seconds does it take to turn 315°?
27. 27.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.🧭 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 right 120°, then left 120°, then left 180°. What does the gyro read now (0° to 359°)?
30. 30.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
31. 31.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times slower (d) 3 times louder
32. 32.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
33. 33.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) wheels (c) propellers (d) tracks
34. 34.📡 A robot is 160 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
35. 35.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
36. 36.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
37. 37.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) teeth (d) spokes
38. 38.⚙️ A motor makes 100 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo moves from 50° to 20°. How many degrees does it turn?

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