Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 346 · 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.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
2. 2.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 35. What is under the sensor? (a) the white floor (b) the black line
3. 3.Which of these suits propellers? (a) a hospital corridor (b) a smooth classroom floor (c) a flat road (d) flying over a field
4. 4.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) sound is slow (d) the sensor is half
5. 5.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
7. 7.🦾 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 left (b) points up and left (c) points right (d) points straight up
8. 8.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) radio music (d) water drops
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 270°. It turns right 90°, then right 45°, then left 45°. What does the gyro read now (0° to 359°)?
10. 10.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
11. 11.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a gyro sensor (c) a light sensor (d) a touch sensor
12. 12.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
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 backward. What does the robot do? (a) stays still (b) spins right on the spot (c) spins left on the spot (d) goes straight back
15. 15.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
16. 16.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
17. 17.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
18. 18.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
19. 19.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
20. 20.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
21. 21.🧭 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 180°. It turns left 180°, then left 60°. What does the gyro read now (0° to 359°)?
22. 22.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
23. 23.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
24. 24.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a bat (d) a snail
25. 25.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 24 seconds (in cm)?
26. 26.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
27. 27.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
28. 28.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
29. 29.True or false: “soft snow” suits tracks. (a) False (b) True
30. 30.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.🧭 A robot should turn right 180°, but its gyro shows it turned 172°. How many degrees must it turn more to the right?
32. 32.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
33. 33.True or false: “hovering over a roof” suits propellers. (a) False (b) True
34. 34.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 18 seconds (in cm)?
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 60
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.Which job needs a light sensor? (a) find the brightest spot (b) read a QR code (c) start on a hand clap (d) warn if motors get hot
37. 37.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
38. 38.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 57. What is under the sensor? (a) the black line (b) the white floor
39. 39.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a white surface (d) a black surface
40. 40.True or false: to hear a whistle, use a light sensor. (a) True (b) False

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