Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 179 · 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.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the battery size (d) the top speed
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points up and left
3. 3.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
4. 4.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 180° (d) 90°
5. 5.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
6. 6.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 52. What is under the sensor? (a) the white floor (b) the black line
7. 7.True or false: “a muddy building site” suits tracks. (a) False (b) True
8. 8.🦾 A servo program runs:
   angle = 140
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
10. 10.True or false: “a field of tall boulders” suits propellers. (a) False (b) True
11. 11.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
12. 12.Which of these suits legs? (a) a flat road (b) loose sand dunes (c) a long factory floor (d) a field of tall boulders
13. 13.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
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 runs backward. What does the robot do? (a) spins left on the spot (b) turns left (c) spins right on the spot (d) goes straight back
15. 15.🧭 A robot should turn right 180°, but its gyro shows it turned 167°. How many degrees must it turn more to the right?
16. 16.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
17. 17.Which job needs a gyro sensor? (a) stay balanced upright (b) know a button is pressed (c) spot a red ball (d) hear a whistle
18. 18.🧭 A robot spins 30° every second. How many seconds does it take to turn 300°?
19. 19.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) driver teeth (d) wheel size
21. 21.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) faster and weaker (c) at the same speed (d) not at all
22. 22.🧭 A robot spins 45° every second. How many seconds does it take to turn 180°?
23. 23.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a light sensor (c) a touch sensor (d) a distance sensor
24. 24.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) turn by exact angles (d) see colours
25. 25.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
26. 26.🛞 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) spins left on the spot (c) goes straight forward (d) turns right
27. 27.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
28. 28.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black line (c) a dark tunnel (d) a black surface
29. 29.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
31. 31.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
32. 32.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
33. 33.⚙️ 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
34. 34.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
35. 35.🔍 Why do robots need sensors? (a) to look colourful (b) to know their world (c) to be heavier (d) to use more power
36. 36.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
38. 38.🔍 Which sensor helps a robot spot a red ball? (a) a camera (b) a distance sensor (c) a touch sensor (d) a sound sensor
39. 39.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) propellers (c) legs (d) wheels
40. 40.Which job needs a temperature sensor? (a) know a button is pressed (b) spot a red ball (c) warn if motors get hot (d) measure a turn angle

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