Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 699 · 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 robot spins 15° every second. How many seconds does it take to turn 165°?
2. 2.🧭 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 right 30°. What does the gyro read now (0° to 359°)?
3. 3.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
4. 4.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
5. 5.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
6. 6.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to be heavier (d) to look colourful
7. 7.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
8. 8.Which job needs a temperature sensor? (a) warn if motors get hot (b) read a QR code (c) find the brightest spot (d) feel a bump into a wall
9. 9.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
10. 10.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 50
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
12. 12.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
13. 13.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its diameter (d) its weight
14. 14.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
16. 16.🔢 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
17. 17.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a cow (d) a snail
18. 18.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
19. 19.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are shiny (c) they spread the weight (d) they are round
20. 20.Which of these suits propellers? (a) a hospital corridor (b) a muddy building site (c) stepping over wide gaps (d) flying over a field
21. 21.🔍 Which sensor helps a robot warn if motors get hot? (a) a distance sensor (b) a sound sensor (c) a gyro sensor (d) a temperature sensor
22. 22.🛞 Circumference = π × … (a) diameter (b) speed (c) weight (d) radius only
23. 23.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) legs (c) wheels (d) tracks
25. 25.🛞 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)?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 2 (d) 1
29. 29.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a camera
33. 33.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
34. 34.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
35. 35.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 1 km (d) 34 cm
36. 36.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
37. 37.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.🧭 A robot spins 15° every second. How many seconds does it take to turn 225°?
39. 39.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
40. 40.🧭 A robot faces north. It does: turn left, turn right. Which way does it face now? (a) north (b) west (c) east (d) south

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