Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 82 · 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.Which of these suits legs? (a) a hospital corridor (b) a smooth classroom floor (c) a muddy building site (d) crossing stepping-stones
2. 2.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
4. 4.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
5. 5.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
6. 6.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
7. 7.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
9. 9.Which job needs a touch sensor? (a) hear a whistle (b) feel a bump into a wall (c) start on a hand clap (d) follow a black line
10. 10.⚙️ A motor makes 500 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
11. 11.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it jumps (c) it stops for ever (d) one wheel runs faster
12. 12.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
13. 13.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 18. What is under the sensor? (a) the white floor (b) the black line
14. 14.📡 A robot is 110 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
15. 15.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black soaks up light (d) black is hot
16. 16.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points left (c) points up and right (d) points right
17. 17.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
18. 18.🧭 A robot faces east. It does: turn around, turn right, turn left, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
19. 19.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 61. What is under the sensor? (a) the white floor (b) the black line
21. 21.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
22. 22.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) colour (d) turning (rotation)
23. 23.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
25. 25.Which job needs a temperature sensor? (a) stay balanced upright (b) warn if motors get hot (c) spot a red ball (d) find the brightest spot
26. 26.🧭 A robot faces north. It does: turn around, turn around. Which way does it face now? (a) south (b) west (c) north (d) east
27. 27.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
28. 28.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
29. 29.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
33. 33.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22/7 (d) 22
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
35. 35.📡 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?
36. 36.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
38. 38.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
40. 40.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) slower (d) faster

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