Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 133 · 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 wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.Which job needs a distance sensor? (a) stop before a wall (b) hear a whistle (c) stay balanced upright (d) feel a bump into a wall
3. 3.🛞 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 forward. What does the robot do? (a) turns left (b) goes straight forward (c) turns right (d) spins right on the spot
4. 4.📡 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?
5. 5.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) harder to balance (d) too fast on floors
6. 6.Which job needs a touch sensor? (a) know a button is pressed (b) spot a red ball (c) measure how far a box is (d) read a QR code
7. 7.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a touch sensor (c) a temperature sensor (d) a gyro sensor
8. 8.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
11. 11.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower
12. 12.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) tracks (c) propellers (d) wheels
13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
14. 14.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 3 (c) 2 (d) 4
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 270°. It turns right 45°, then right 135°, then right 45°. What does the gyro read now (0° to 359°)?
16. 16.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
17. 17.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
18. 18.🛞 Circumference = π × … (a) weight (b) speed (c) radius only (d) diameter
19. 19.🧭 A robot should turn right 180°, but its gyro shows it turned 194°. How many degrees must it turn back to the left?
20. 20.Which job needs a gyro sensor? (a) know a button is pressed (b) spot a red ball (c) stay balanced upright (d) warn if motors get hot
21. 21.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
22. 22.🧭 A robot should turn right 45°, but its gyro shows it turned 30°. How many degrees must it turn more to the right?
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
26. 26.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
27. 27.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
28. 28.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
29. 29.🔦 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
30. 30.📡 A robot is 200 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 11 seconds (in cm)?
31. 31.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
33. 33.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
34. 34.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
35. 35.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
36. 36.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
37. 37.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
38. 38.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
39. 39.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left

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