Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 395 · 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.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
2. 2.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points straight up (c) points left (d) points right
4. 4.Which job needs a touch sensor? (a) feel a bump into a wall (b) warn if motors get hot (c) follow a black line (d) start on a hand clap
5. 5.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) nowhere (d) faster
6. 6.🔢 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
7. 7.True or false: to hear a whistle, use a light sensor. (a) False (b) True
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
9. 9.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
10. 10.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
11. 11.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
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 90°. It turns right 45°, then left 135°. What does the gyro read now (0° to 359°)?
13. 13.⚙️ A motor makes 100 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
14. 14.📡 A robot is 210 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)?
15. 15.True or false: to stop before a wall, use a temperature sensor. (a) True (b) False
16. 16.⚙️ 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
17. 17.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
18. 18.🛞 Which way of moving suits this best: “soft snow”? (a) legs (b) wheels (c) tracks (d) propellers
19. 19.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its diameter (c) its weight (d) its radius
20. 20.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 41 seconds (in cm)?
21. 21.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 3 (c) 4 (d) 1
23. 23.🧭 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 120°, then left 120°. What does the gyro read now (0° to 359°)?
24. 24.🧭 A robot faces west. It does: turn right, turn around. Which way does it face now? (a) south (b) east (c) west (d) north
25. 25.Which job needs a camera? (a) find the brightest spot (b) follow a black line (c) read a QR code (d) feel a bump into a wall
26. 26.🧭 A robot faces west. It does: turn right, turn right, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
27. 27.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a black surface (d) a white surface
28. 28.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
29. 29.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
30. 30.True or false: “flying over a field” suits propellers. (a) True (b) False
31. 31.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
32. 32.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
33. 33.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 72. What is under the sensor? (a) the black line (b) the white floor
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
35. 35.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
36. 36.🔍 Which sensor helps a robot start on a hand clap? (a) a gyro sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
37. 37.Which of these suits wheels? (a) a flat road (b) loose sand dunes (c) soft snow (d) stepping over wide gaps
38. 38.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
39. 39.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) pins (c) spokes (d) tyres
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?

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