Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 928 · 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 sensor measure? (a) colour (b) temperature (c) sound (d) turning (rotation)
2. 2.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it jumps (d) it stops for ever
3. 3.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
5. 5.⚙️ 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 big driver gear (b) a small driver gear
6. 6.🛞 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) turns right (b) spins left on the spot (c) goes straight back (d) spins right on the spot
7. 7.🧭 A robot faces east. It does: turn right, turn left. Which way does it face now? (a) south (b) north (c) east (d) west
8. 8.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
9. 9.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
10. 10.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
11. 11.🧭 A robot should turn right 90°, but its gyro shows it turned 103°. How many degrees must it turn back to the left?
12. 12.🧭 A robot should turn right 180°, but its gyro shows it turned 170°. How many degrees must it turn more to the right?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
15. 15.True or false: “a muddy building site” suits tracks. (a) True (b) False
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.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
20. 20.🧭 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 90°. It turns left 30°, then left 180°. What does the gyro read now (0° to 359°)?
21. 21.⬛ 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 hot (d) black is wet
22. 22.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
24. 24.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
25. 25.📡 A robot is 240 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
26. 26.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
27. 27.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
28. 28.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) white (d) black
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
30. 30.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ A motor makes 300 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
32. 32.🧭 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 90°. It turns right 180°, then right 30°, then left 180°. What does the gyro read now (0° to 359°)?
33. 33.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) teeth (c) tyres (d) pins
38. 38.🧭 A robot faces south. It does: turn right, turn around. Which way does it face now? (a) south (b) north (c) east (d) west
39. 39.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times faster (d) 3 times louder
40. 40.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a camera (c) a sound sensor (d) a gyro sensor

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