Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 132 · 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 job needs a distance sensor? (a) know a button is pressed (b) start on a hand clap (c) stop before a wall (d) spot a red ball
2. 2.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
3. 3.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
6. 6.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
7. 7.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
8. 8.🧭 A robot should turn right 45°, but its gyro shows it turned 41°. How many degrees must it turn more to the right?
9. 9.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 36 times. How many times does the driven gear turn?
10. 10.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
11. 11.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) a gear (d) an input
12. 12.Which of these suits propellers? (a) a long factory floor (b) flying over a field (c) a flat road (d) deep mud
13. 13.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
15. 15.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is wet (d) black is hot
16. 16.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
18. 18.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) turns right (b) stays still (c) goes straight back (d) spins right on the spot
19. 19.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
20. 20.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
21. 21.🧭 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 0°. It turns right 60°, then right 120°. What does the gyro read now (0° to 359°)?
22. 22.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
23. 23.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points straight up (c) points left (d) points right
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 90. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
26. 26.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) propellers (c) legs (d) tracks
27. 27.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
28. 28.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) faster (d) backwards
29. 29.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) teeth (d) spokes
30. 30.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
31. 31.⚙️ A 10-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
32. 32.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
33. 33.🧭 A robot should turn right 180°, but its gyro shows it turned 194°. How many degrees must it turn back to the left?
34. 34.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
35. 35.🛞 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 back (b) turns left (c) stays still (d) goes straight forward
36. 36.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) hear claps (c) see colours (d) smell smoke

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