Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 686 · 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 clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
2. 2.🦾 A servo program runs:
   angle = 130
   angle = angle − 30
   angle = angle − 60
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.🔢 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
4. 4.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
6. 6.🧭 A robot should turn right 90°, but its gyro shows it turned 93°. How many degrees must it turn back to the left?
7. 7.🔍 Which sensor helps a robot stop before a wall? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
9. 9.🧭 A robot should turn right 90°, but its gyro shows it turned 87°. How many degrees must it turn more to the right?
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
11. 11.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
12. 12.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a gyro sensor (c) a light sensor (d) a touch sensor
13. 13.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: to feel a bump into a wall, use a sound sensor. (a) False (b) True
15. 15.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
16. 16.⚙️ A 16-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
17. 17.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) zero (d) small (fast, weak)
18. 18.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
19. 19.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
20. 20.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) spokes (d) teeth
21. 21.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
22. 22.Which job needs a light sensor? (a) read a QR code (b) know a button is pressed (c) find the brightest spot (d) warn if motors get hot
23. 23.🔍 Why do robots need sensors? (a) to know their world (b) to be heavier (c) to use more power (d) to look colourful
24. 24.🦾 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 up and left (b) points left (c) points straight up (d) points right
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ A 16-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) goes straight back (d) turns left
29. 29.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
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 wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
33. 33.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
34. 34.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) turns left (c) stays still (d) goes straight back
35. 35.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a servo (d) a caster wheel
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
38. 38.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
39. 39.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
40. 40.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels

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