Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 48 · 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.⚙️ An 8-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points straight up (b) points up and right (c) points left (d) points up and left
3. 3.🧭 A robot faces east. It does: turn left, turn right, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
4. 4.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
5. 5.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
6. 6.Which of these suits tracks? (a) soft snow (b) a flat road (c) a hospital corridor (d) a field of tall boulders
7. 7.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
8. 8.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
9. 9.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
10. 10.Which job needs a light sensor? (a) find the brightest spot (b) stop before a wall (c) read a QR code (d) know a button is pressed
11. 11.True or false: “a flat road” suits wheels. (a) False (b) True
12. 12.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins right on the spot (b) stays still (c) goes straight forward (d) spins left on the spot
13. 13.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
14. 14.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
16. 16.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
17. 17.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
18. 18.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) legs (d) propellers
20. 20.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a light sensor (c) a camera (d) a sound sensor
21. 21.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
22. 22.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
23. 23.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
25. 25.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 17. What is under the sensor? (a) the black line (b) the white floor
26. 26.⚙️ 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 small driver gear (b) a big driver gear
27. 27.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
28. 28.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) wheels (c) propellers (d) tracks
29. 29.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ A 40-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
31. 31.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
32. 32.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster but weaker
33. 33.True or false: “a field of tall boulders” suits legs. (a) False (b) True
34. 34.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) tyre (c) idler gear (d) driven gear
35. 35.⚙️ A 10-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
36. 36.True or false: “deep mud” suits propellers. (a) True (b) False
37. 37.🧭 A robot should turn right 90°, but its gyro shows it turned 98°. How many degrees must it turn back to the left?
38. 38.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
39. 39.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
40. 40.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) legs (c) tracks (d) wheels

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