Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 809 · 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 10 over black and 60 over white. A good threshold is halfway between them. What is it?
2. 2.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
3. 3.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a white surface (c) a black line (d) a dark tunnel
4. 4.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
5. 5.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
6. 6.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) to make it smaller (d) the sensor is half
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
11. 11.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) teeth (d) spokes
12. 12.True or false: to feel a bump into a wall, use a temperature sensor. (a) False (b) True
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.🧭 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 180°. It turns left 60°, then left 180°, then left 60°. What does the gyro read now (0° to 359°)?
16. 16.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a camera
17. 17.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 84. What is under the sensor? (a) the black line (b) the white floor
18. 18.🧭 A robot should turn right 90°, but its gyro shows it turned 101°. How many degrees must it turn back to the left?
19. 19.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
20. 20.🔍 Which sensor helps a robot read a QR code? (a) a light sensor (b) a camera (c) a temperature sensor (d) a distance sensor
21. 21.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
22. 22.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
23. 23.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
24. 24.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an input (d) an output
25. 25.🧭 A robot spins 15° every second. How many seconds does it take to turn 360°?
26. 26.⚙️ A motor makes 360 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?
27. 27.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
28. 28.🧭 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 180°. It turns right 120°, then right 45°, then right 120°. What does the gyro read now (0° to 359°)?
29. 29.⚙️ A 30-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
30. 30.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a camera
31. 31.Which of these suits legs? (a) soft snow (b) a long factory floor (c) a field of tall boulders (d) a hospital corridor
32. 32.🔦 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 white floor (b) the black line
33. 33.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
34. 34.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
35. 35.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
36. 36.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.🧭 A robot should turn right 180°, but its gyro shows it turned 179°. How many degrees must it turn more to the right?
38. 38.🛞 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 right on the spot (b) turns left (c) spins left on the spot (d) goes straight forward
39. 39.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
40. 40.🦾 A servo moves from 170° to 0°. How many degrees does it turn?

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