Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 285 · 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 is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 5 seconds (in cm)?
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) backwards (d) faster
4. 4.🧭 A robot faces east. It does: turn right, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
5. 5.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) slower but stronger (c) faster and weaker (d) not at all
6. 6.Which job needs a camera? (a) read a QR code (b) feel a bump into a wall (c) warn if motors get hot (d) stay balanced upright
7. 7.Which of these suits tracks? (a) hovering over a roof (b) a flat road (c) a field of tall boulders (d) deep mud
8. 8.True or false: to find the brightest spot, use a sound sensor. (a) True (b) False
9. 9.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) white (d) the sky
10. 10.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
11. 11.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) smell smoke (d) hear claps
12. 12.🛞 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) spins right on the spot (b) spins left on the spot (c) turns right (d) goes straight back
13. 13.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
15. 15.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 180° (d) 360°
16. 16.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) turning (rotation) (d) sound
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
19. 19.🧭 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 30°, then right 30°. What does the gyro read now (0° to 359°)?
20. 20.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
21. 21.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
24. 24.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
25. 25.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the wheel size (d) the black/white cut-off
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
27. 27.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
30. 30.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.Which of these suits wheels? (a) soft snow (b) hovering over a roof (c) a field of tall boulders (d) a long factory floor
34. 34.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
36. 36.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
38. 38.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
40. 40.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size

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