Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 83 · 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.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a cow (d) a snail
2. 2.⚙️ A motor makes 440 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
3. 3.Which job needs a light sensor? (a) spot a red ball (b) stop before a wall (c) follow a black line (d) measure a turn angle
4. 4.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
5. 5.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
7. 7.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
8. 8.🦾 A servo program runs:
   angle = 120
   angle = angle + 10
   angle = angle − 30
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.Which job needs a gyro sensor? (a) start on a hand clap (b) feel a bump into a wall (c) know a button is pressed (d) measure a turn angle
10. 10.⚙️ A 36-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
11. 11.🧭 A robot should turn right 45°, but its gyro shows it turned 49°. How many degrees must it turn back to the left?
12. 12.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 360° (d) 180°
15. 15.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driver gear (c) driven gear (d) idler gear
16. 16.📡 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?
17. 17.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
18. 18.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
19. 19.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 29. What is under the sensor? (a) the white floor (b) the black line
20. 20.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
21. 21.🦾 A servo moves from 10° to 90°. How many degrees does it turn?
22. 22.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
23. 23.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 100° (d) 90°
24. 24.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) sound (d) turning (rotation)
25. 25.Which of these suits propellers? (a) a muddy building site (b) a long factory floor (c) crossing stepping-stones (d) hovering over a roof
26. 26.🧭 A robot faces east. It does: turn right, turn around, turn left, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
27. 27.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
28. 28.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
29. 29.Which of these suits legs? (a) loose sand dunes (b) a long factory floor (c) soft snow (d) a field of tall boulders
30. 30.Which of these suits legs? (a) a long factory floor (b) a muddy building site (c) stepping over wide gaps (d) a smooth classroom floor
31. 31.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 50
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.🧭 A robot faces west. It does: turn around, turn right, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
33. 33.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
34. 34.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 14. What is under the sensor? (a) the black line (b) the white floor
35. 35.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🧭 A robot faces west. It does: turn right, turn right, turn right, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
38. 38.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 550 cm?
39. 39.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
40. 40.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?

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