Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 681 · 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.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 31. What is under the sensor? (a) the black line (b) the white floor
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
3. 3.True or false: “a flat road” suits wheels. (a) True (b) False
4. 4.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
5. 5.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.🧭 A robot spins 15° every second. How many seconds does it take to turn 330°?
10. 10.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
11. 11.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) turns left (d) goes straight back
12. 12.🧭 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 180°, then right 180°, then right 120°. What does the gyro read now (0° to 359°)?
13. 13.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the battery size (d) the wheel size
14. 14.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 42. What is under the sensor? (a) the black line (b) the white floor
15. 15.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
16. 16.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
17. 17.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points straight up (b) points up and left (c) points up and right (d) points left
18. 18.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times faster (d) 3 times louder
19. 19.🧭 A robot should turn right 90°, but its gyro shows it turned 79°. How many degrees must it turn more to the right?
20. 20.Which job needs a light sensor? (a) start on a hand clap (b) follow a black line (c) feel a bump into a wall (d) measure how far a box is
21. 21.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 36. What is under the sensor? (a) the white floor (b) the black line
22. 22.Which of these suits tracks? (a) a flat road (b) deep mud (c) hovering over a roof (d) a long factory floor
23. 23.True or false: to find the brightest spot, use a touch sensor. (a) False (b) True
24. 24.🛞 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 12 times. How far does the robot roll (in cm)?
25. 25.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
27. 27.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a bat (d) a goldfish
28. 28.Which job needs a sound sensor? (a) follow a black line (b) find the brightest spot (c) start on a hand clap (d) stay balanced upright
29. 29.🛞 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 9 times. How far does the robot roll (in cm)?
30. 30.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns left (b) spins right on the spot (c) goes straight back (d) goes straight forward
31. 31.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
32. 32.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a sound sensor (c) a touch sensor (d) a gyro sensor
33. 33.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is hot (d) black is loud
34. 34.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
35. 35.Which of these suits legs? (a) a smooth classroom floor (b) soft snow (c) crossing stepping-stones (d) loose sand dunes
36. 36.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
37. 37.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
38. 38.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?

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