Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 333 · 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 motor makes 100 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
2. 2.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a temperature sensor (c) a camera (d) a touch sensor
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 75. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
4. 4.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
5. 5.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) in opposite directions (d) they do not turn
6. 6.Which job needs a sound sensor? (a) hear a whistle (b) know a button is pressed (c) read a QR code (d) measure a turn angle
7. 7.True or false: to warn if motors get hot, use a light sensor. (a) True (b) False
8. 8.Which job needs a touch sensor? (a) feel a bump into a wall (b) follow a black line (c) measure a turn angle (d) warn if motors get hot
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 30°, then right 30°. What does the gyro read now (0° to 359°)?
10. 10.Which job needs a temperature sensor? (a) stop before a wall (b) find the brightest spot (c) warn if motors get hot (d) know a button is pressed
11. 11.🛞 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) turns right (b) spins left on the spot (c) goes straight back (d) turns left
12. 12.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a black line (d) a white surface
13. 13.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) tyres (d) teeth
14. 14.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
15. 15.Which of these suits wheels? (a) flying over a field (b) stepping over wide gaps (c) a smooth classroom floor (d) deep mud
16. 16.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
17. 17.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
18. 18.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 50
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
21. 21.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
22. 22.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
24. 24.🧭 A robot faces east. It does: turn right, turn around, turn around. Which way does it face now? (a) north (b) east (c) south (d) west
25. 25.True or false: “a flat road” suits wheels. (a) True (b) False
26. 26.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is hot (d) black is wet
27. 27.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a camera (c) a light sensor (d) a sound sensor
28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
29. 29.True or false: to stop before a wall, use a sound sensor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ 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
33. 33.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.Which job needs a light sensor? (a) hear a whistle (b) follow a black line (c) stop before a wall (d) measure a turn angle
36. 36.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
38. 38.🛞 Circumference = π × … (a) radius only (b) diameter (c) weight (d) speed
39. 39.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False

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