Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 405 · 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.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) see colours (d) hear claps
2. 2.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
5. 5.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a sound sensor
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
7. 7.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
10. 10.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
11. 11.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
13. 13.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
14. 14.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
15. 15.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
16. 16.🔦 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
17. 17.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
18. 18.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
21. 21.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a snail (d) a cow
22. 22.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 20
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.Which of these suits legs? (a) a muddy building site (b) stepping over wide gaps (c) a long factory floor (d) a smooth classroom floor
24. 24.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
25. 25.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times slower (d) 3 times faster
26. 26.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) water (d) the sky
27. 27.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) turns left (c) turns right (d) stays still
29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
30. 30.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) legs (b) tracks (c) wheels (d) propellers
31. 31.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
32. 32.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a white surface (d) a dark tunnel
33. 33.Which of these suits propellers? (a) a flat road (b) crossing stepping-stones (c) moving under water (d) a smooth classroom floor
34. 34.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
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) turns right (b) goes straight back (c) stays still (d) turns left
36. 36.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
37. 37.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
38. 38.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
39. 39.🧭 A robot faces south. It does: turn right, turn left, turn around. Which way does it face now? (a) east (b) south (c) west (d) north
40. 40.Which of these suits wheels? (a) a hospital corridor (b) hovering over a roof (c) stepping over wide gaps (d) a muddy building site

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