Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 103 · 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 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) spins left on the spot (b) turns left (c) spins right on the spot (d) goes straight forward
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points straight up
3. 3.🛞 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 left (b) goes straight back (c) stays still (d) spins right on the spot
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
5. 5.🛞 Why do most indoor robots use wheels? (a) they look funny (b) fast and easy on floors (c) they float (d) they climb stairs
6. 6.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
8. 8.Which of these suits legs? (a) a hospital corridor (b) crossing stepping-stones (c) moving under water (d) a muddy building site
9. 9.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
11. 11.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) see colours (d) turn by exact angles
12. 12.📡 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)?
13. 13.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
14. 14.🛞 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) turns left (c) goes straight forward (d) spins right on the spot
15. 15.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
17. 17.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
18. 18.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
20. 20.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
21. 21.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 360° (d) 180°
22. 22.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black soaks up light (d) black is loud
23. 23.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
24. 24.🧭 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 270°. It turns left 45°, then left 30°, then left 45°. What does the gyro read now (0° to 359°)?
25. 25.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
26. 26.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
27. 27.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) they do not turn (d) one up, one down
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
30. 30.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a touch sensor (c) a camera (d) a gyro sensor
31. 31.🧭 A robot should turn right 180°, but its gyro shows it turned 182°. How many degrees must it turn back to the left?
32. 32.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
33. 33.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) legs (d) wheels
34. 34.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
35. 35.🧭 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 270°. It turns right 120°, then left 60°, then left 135°. What does the gyro read now (0° to 359°)?
36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
37. 37.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) at the same speed (c) slower but stronger (d) not at all
38. 38.Which of these suits propellers? (a) a smooth classroom floor (b) soft snow (c) a flat road (d) moving under water
39. 39.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor

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